JP2013218896A - External tripping device of circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an external tripping device of a circuit breaker capable of increasing the size of an electromagnet device in the winding-axial direction of a coil.SOLUTION: An interlocking piece 11 having an interlocking rod 10, an operation handle 12, a drive member 13, a link 14, a latch member 15 and an electromagnet device 16 are housed in the housing. The electromagnetic device 16 includes: a coil 32 which is switched according to whether or not to be excited at the voltage abnormal time of a power supply and at the voltage normal time thereof; a fixed iron core 33 whose one leg piece 33a is passed through the center of the coil 32; a movable iron core 35 which is attracted to a magnetic pole of the fixed iron core 33 when the coil 35 is excited; and a holder member 34 which is rotatably arranged with holding the movable iron core 35 and drives the latch member 15 at the voltage abnormal time of the power supply. In the housing, a groove 2c into which a mounting rail is inserted is provided on the surface opposite to the front surface from which an operation portion of the operation handle 12 is exposed. The electromagnetic device 16 is housed inside the housing so that the winding-axial direction of the coil 32 is parallel to the front surface.

Description

  The present invention relates to an external trip device for a circuit breaker.

  Conventionally, there has been a circuit breaker that interrupts the electric circuit and stops power supply to the load device when the load current exceeds the upper limit value so that the load device and the electric wire are not burned out due to an overcurrent that flows at the time of a short circuit (for example, Patent Documents) 1).

  Conventionally, there has been a circuit breaker that protects a circuit by interrupting an electric circuit when a ground fault or a short circuit is detected so that an overcurrent does not flow due to a ground fault or electric leakage.

  This type of circuit breaker is standardized or standardized in shape and size for each country or region, and the circuit breaker disclosed in Patent Document 1 is widely used in European and Asian countries. It conforms to the DIN standard. The circuit breaker conforming to the DIN standard is provided with a groove for passing the mounting rail on the back surface of the housing so that it can be mounted across the linear mounting rail fixed to the distribution board or the like. . The mounting rail is made of metal, and has a horizontally long central piece, a pair of side pieces projecting in one direction (a direction perpendicular to the central piece) from two sides along the longitudinal direction of the central piece, It is formed in a shape in which a locking piece protruding outward from the leading edge is integrally formed. The circuit breaker is attached to the mounting rail by passing the mounting rail through the groove on the back surface and locking the claw provided on the end surface of the groove with the locking piece.

JP 2000-231869 A

  The circuit breaker described above protects load equipment and electric wires when a short circuit, ground fault, or electric leakage occurs. In addition to the above, abnormalities in the power supply voltage can be considered as abnormalities in the load circuit. If a voltage that falls below the allowable voltage range (hereinafter referred to as undervoltage) or a voltage that exceeds the allowable voltage range (hereinafter referred to as excessive voltage) is applied to the electrical equipment connected to the load circuit, There is a problem that the operation of the device becomes unstable or excessive stress is applied.

  Therefore, an external trip device for turning off the circuit breaker when an abnormality in the power supply voltage is detected has been proposed. By connecting an external trip device to the circuit breaker and connecting it, It is possible to protect the load equipment from

  In such an external trip device, the interlocking rod protrudes from the side of the housing, and this interlocking rod is inserted into the housing of the connected circuit breaker. The circuit breaker switching mechanism is tripped. Similar to the circuit breaker, a groove for passing the mounting rail is provided on the back surface of the external trip device, and the surface opposite to the surface on which the groove is provided (this surface is referred to as an operation surface) is connected. A handle for moving the interlocking bar is provided in conjunction with the on / off operation of the circuit breaker. An electromagnet device for moving the interlocking rod when the power supply voltage is abnormal is housed inside the external trip device. The electromagnet device includes a coil wound around a bobbin, a fixed iron core that is passed through a hole in the bobbin, and a movable iron core that is attracted to a magnetic pole of the fixed iron core when the coil is energized. In the conventional external trip device, the electromagnet device is housed inside the casing so that the winding axis direction of the coil is substantially orthogonal to the operation surface. On the other hand, an opening / closing mechanism for operating the interlocking rod in response to handle operation or excitation of the electromagnet device is housed on the operation surface side inside the housing, so that the size of the electromagnet device is reduced in the coil winding axis direction. There was a need. In order to reduce the size of the electromagnet device, for example, it is necessary to bend the portion of the fixed core that is outside the coil to reduce the length dimension, and to bend the fixed core that is thicker than the terminal plate. However, there is a problem that the processing cost is high and the cost is high.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive external trip device for a circuit breaker that can increase the size of an electromagnet device in the coil winding axis direction. It is to provide.

  In order to solve the above-mentioned problems, an external trip device for a circuit breaker according to the present invention is arranged in connection with a circuit breaker having one or more poles and is supplied to a load via the circuit breaker. When the voltage is abnormal, the circuit breaker is turned off. The external trip device includes a housing that is attached so as to be connected to the body of the circuit breaker, and an interlocking rod, an operation unit, a drive member, a link, and a latch member are provided inside the housing. And an electromagnet device. A part of the interlocking bar protrudes from a side surface of the housing facing the circuit breaker, and the contact of the circuit breaker is turned off at the protruding portion. An operation part of the operation unit is exposed to the outside from the front surface of the casing. The driving member is rotatably supported by the casing and drives the interlocking rod. One end side of the link is supported by the operation unit, and the movement of the operation unit is transmitted to the drive member. The latch member latches the other end side of the link with the drive member. The electromagnet device drives the latch member when the voltage of the power supply is abnormal, and releases the other end side of the link to the outside from between the latch member and the drive member, whereby the drive member is moved by the spring force of the return spring. Move away from the interlocking rod. The electromagnet device includes a coil, a stator, a mover, and a holder member. The coil is energized by a power source connected to a connection terminal provided in the casing, and is switched between being excited or not when the voltage of the power source is abnormal and normal. The stator is at least partially passed through the center of the coil. The mover is attracted to the magnetic poles of the stator when the coil is excited. The holder member is rotatably disposed to hold the mover, and drives the latch member when the power supply voltage is abnormal. The casing is provided with a groove into which a mounting rail is inserted on a surface opposite to the front surface where the operation portion of the operation portion is exposed, and the electromagnet device has a winding axis direction of the coil parallel to the front surface. Thus, it is housed inside the housing.

  In this external trip device, when the power supply voltage input to the connection terminal exceeds a predetermined set value higher than the rated voltage, the coil is excited so that the latch member is driven by the holder member. It is also preferable to provide an excitation circuit for switching whether or not.

  In this external trip device, the coil is excited so that the latch member is driven by the holder member when a power supply voltage input to the connection terminal falls below a predetermined set value lower than a rated voltage. It is also preferable to provide an excitation circuit for switching whether or not.

  In this external trip device, it is also preferable to switch whether to excite the coil by a signal input to the connection terminal from an external detection device.

  The external trip device further includes first and second fixed contacts, one of which is electrically connected to the coil, and a movable contact plate. One end of the movable contact plate is disposed between the first and second fixed contacts, movable contacts are provided on both sides of the one end, and the other end is fixed to the connection terminal by welding. The movable contact plate is in a state where one of the movable contacts is in contact with the first fixed contact or the other of the movable contacts is in contact with the second fixed contact according to the rotation of the driving member. Can be switched to. The movable contact plate is preferably folded between one end side and the other end side, and a portion of the movable contact plate that is welded and fixed to the connection terminal is preferably bent outward as viewed from the folded portion.

  In this external trip device, it is also preferable that the driving member is provided with a first protrusion, a second protrusion, and a third protrusion. The first protrusion engages with the folded portion of the movable contact plate. The second protrusion pushes the movable contact plate toward the first fixed contact when one of the movable contacts contacts the first fixed contact. The third protrusion pushes the movable contact plate toward the second fixed contact when the other movable contact contacts the second fixed contact.

  In this external trip device, the connection terminal includes a terminal screw and a terminal plate to which the terminal screw is fastened. The terminal plate includes a first plate piece having a screw hole, a second plate piece arranged at a distance from the first plate piece in a thickness direction, and the first plate piece and the second plate piece. And at least a third plate piece connecting the two. It is also preferable that a plurality of the first to third plate pieces is held by the housing from a direction intersecting the axial direction of the terminal screw.

  In this external trip device, it is also preferable that the mover is provided so as to protrude outward from the magnetic pole surface of the stator.

  In the external trip device, the driving member is preferably configured by combining a molded product molded from a synthetic resin and a metal component in which at least a portion in contact with the link is formed of metal.

  According to the present invention, since the operation part of the operation unit is exposed from the front surface of the housing, the interlock rod, the operation unit, the drive member, the link, and the latch member are accommodated inside the housing on the side close to the front surface. The Therefore, when the electromagnet device is accommodated so that the winding axis direction of the coil is along the front-rear direction, it is necessary to downsize the electromagnet device in the winding axis direction, but the winding axis direction is parallel to the front surface. Since the electromagnet device is disposed, the size of the electromagnet device can be increased in the coil winding axis direction. Therefore, it is not necessary to bend a part of the stator in order to reduce the size of the electromagnet device, so that the manufacturing cost of the electromagnet device can be reduced and the manufacturing cost of the external trip device as a whole can be reduced.

The external trip apparatus of Embodiment 1 is shown, (a) is explanatory drawing of an OFF state, (b) is explanatory drawing of an ON state. (A) is explanatory drawing of the state which the latch same as the above removed, (b) is explanatory drawing of a trip state. (A) is explanatory drawing of the state in the middle of resetting a link same as the above, (b) is explanatory drawing which shows the OFF state after a trip. (A) is a front view of the same, (b) is a left side view of the same, (c) is a right side view of the same, and (d) is a top view of the same. The circuit breaker which the external trip apparatus same as the above is attached and attached is shown, (a) is a front view, (b) is a left side view, (c) is a right side view, and (d) is a top view. The state in the middle of connecting the external trip device same as the above to the circuit breaker is shown, (a) is a front view, (b) is a left side view, (c) is an AA cross-sectional view, and (d) is an external perspective view. FIG. The external trip device same as the above is shown connected to the circuit breaker, (a) is a front view, (b) is a right side view, and (c) is a top view. The drive member with which an external trip apparatus same as the above is shown, (a) is a front view, (b) is a top view, (c) is an exploded perspective view. The terminal block with which an external trip apparatus same as the above is shown, (a) is a front view, (b) is a left side view, and (c) is an exploded perspective view. It is sectional drawing of the electromagnet apparatus with which an external trip apparatus same as the above is provided. The external trip apparatus of Embodiment 2 is shown, (a) is explanatory drawing of an OFF state, (b) is explanatory drawing of an ON state. It is explanatory drawing of the state in the middle of releasing a latch same as the above. A trip state is shown, (a) is explanatory drawing seen from the front side, (b) is explanatory drawing seen from the back side. (A) is explanatory drawing of the state from which the same link was removed, (b) is explanatory drawing of the state in the middle of resetting a link. The off state after a trip same as the above is shown, (a) is explanatory drawing seen from the front side, (b) is explanatory drawing seen from the back side. The external trip apparatus of Embodiment 3 is shown, (a) is explanatory drawing of an OFF state, (b) is explanatory drawing of an ON state. (A) is explanatory drawing of the state in the middle of removing a latch same as the above, (b) is explanatory drawing of a trip state. (A) is explanatory drawing of the state in the middle of resetting a link same as the above, (b) is explanatory drawing of the OFF state after a trip.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
The external trip apparatus of Embodiment 1 is demonstrated with reference to FIGS. In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG. 1, and the direction perpendicular to the paper surface is defined as the front-rear direction in FIG. The mounting direction in the state of use 1 is not limited to the above direction. For example, when the external trip device 1 is mounted on a mounting rail provided on the distribution board, the horizontal direction in FIG. 4D is parallel to the vertical direction, and the vertical direction in FIG. 4D is parallel to the horizontal direction. In this way, it can be attached to the mounting rail.

  The external trip device 1 according to the present embodiment is arranged in connection with a circuit breaker 50 having one or more poles, and interrupts a circuit having one or more poles arranged in series when the power supply voltage is abnormal. Used to turn off the device 50. The external trip device 1 includes a built-in excitation circuit that detects an abnormality in the power supply voltage and turns off the circuit breaker 50, and a built-in excitation circuit that does not include a built-in excitation circuit. What will be described. Incidentally, in the external trip device 1 that does not incorporate the excitation circuit, the circuit breaker 50 is turned off in response to a signal from a detection device that detects an abnormality in the power supply voltage. In addition, the abnormality of the power supply voltage includes an overvoltage abnormality exceeding a predetermined set value higher than the rated voltage (Ue) (for example, 280 V when the rated voltage is 200 V), and a predetermined set value lower than the rated voltage (for example, the rated voltage). The undervoltage abnormality is less than 35% to 70%), and in the present embodiment, what detects an overvoltage abnormality will be described.

  As shown in FIGS. 4A to 4D, the external trip device 1 has a width dimension in the horizontal direction and a height dimension in the vertical direction shown in FIG. A box-shaped housing 2 having a small thickness dimension in the depth direction shown in the left-right direction is provided. The housing 2 is configured by combining a body 3, a cover 4, and a terminal block 5. Each of the body 3 and the cover 4 is made of a synthetic resin molded product, and is formed in a shape in which the housing 2 is divided into two in the front-rear direction. The body 3 has an opening on the front and left side, and the cover 4 is on the rear surface. And the left side is open. The body 3 and the cover 4 are overlapped and coupled in the depth direction so as to close each other's opening. The terminal block 5 is made of a synthetic resin molded product, and is attached so as to close an opening formed on the left side when the body 3 and the cover 4 are overlapped.

  The housing 2 is formed in the same shape and size as the circuit breaker 50 (see FIG. 5) conforming to the DIN standard. In the lower part of the housing 2, a groove 2 c is provided for allowing the mounting rail 60 conforming to the DIN standard to pass therethrough. The mounting rail 60 is made of metal and has a horizontally long central piece 61, a pair of side pieces 62 that project in one direction (a direction perpendicular to the central piece 61) from the two long sides of the central piece 61, and each side A locking piece 63 that protrudes outward from the leading edge of the piece 62 is integrally provided. A groove 54 into which the mounting rail 60 is inserted is provided in the lower part of the device body 51 of the circuit breaker 50, and a protrusion 55 that engages with one locking piece 63 is provided on one end face of the groove 54. It has been. On the other end face of the groove 54, a claw 56a that engages with the other engagement piece 63 is provided so as to be able to advance and retract. The other end of the operation piece 56 provided with the claw 56a on one end side protrudes outward from the side surface of the container body 51. When the operation piece 56 is pulled, the claw 56a moves away from the locking piece 63. Therefore, the body 51 of the circuit breaker 50 can be attached to and detached from the mounting rail 60.

  Two projections 6 are provided on the upper side and plate-like projections 7 on the lower side of the front and rear side surfaces of the housing 2 facing the circuit breaker 50. A downward claw 6 a is provided at the tip of each protrusion 6. Protrusions 8 that are shorter than the protrusions 6 are provided in the vicinity of the protrusions 6. As shown in FIG. 6 (b), the body 51 of the circuit breaker 50 is provided with an insertion hole 52 at a position facing the protrusion 6, and a slot (not shown) at a position facing the protrusion 7. Is provided.

  When attaching the housing 2 to the container body 51, as shown in FIGS. 6A to 6D, the operator tilts the housing 2 obliquely so that the upper side of the housing 2 approaches the container body 51. In this state, the housing 2 is brought close to the container body 51, the upper protrusion 6 is inserted into the insertion hole 52, and the claw 6 a is locked to the inner surface of the insertion hole 52. Next, the operator rotates the housing 2 in a direction in which the lower portion of the housing 2 approaches the container 51 with the claw 6a as a fulcrum. Then, as shown in FIG. 7, when the side surfaces of the housing 2 and the container body 51 are brought into contact with each other, the lower protrusion 6 is inserted into the groove hole of the container body 51, and the housing 2 is attached to the container body 51. It becomes a state. Further, the housing 2 is positioned with respect to the body 51 by inserting the protrusion 8 into a hole (not shown) provided on the side surface of the body 51.

  As shown in FIGS. 1, 4 and 9, the terminal block 5 is provided with pedestal portions 5b and 5c to which screw terminals are attached in two upper and lower stages, so as not to obstruct the screw tightening operation. The portion 5b and the lower pedestal portion 5c are provided with their positions shifted in the left-right direction. Two screw terminals 9 can be mounted side by side in the front-rear direction (left-right direction in FIG. 9B) on the pedestal portions 5b, 5c, and the two screw terminals 9 lined up in the front-rear direction are insulated. Insulating wall 5 a is provided integrally with terminal block 5. Each of the pedestal portions 5b and 5c is provided with a mounting groove 5d opened on the inner side (left side in FIG. 9A), and the screw terminal 9 is inserted and fixed into the mounting groove 5d from the inner side. Yes. Further, protective walls 5e having holes for inserting a screwdriver or the like are provided on the upper sides of the pedestals 5b and 5c, respectively.

  The screw terminal 9 includes a terminal plate 40, a terminal screw 41 screwed to the terminal plate 40, and a washer 42 that is passed through the terminal screw 41 and sandwiches an electric wire with the terminal plate 40. The terminal plate 40 is formed by bending a conductive strip, and integrally includes an upper plate 40a, a vertical plate 40b, a lower plate 40c, and a weld piece 40d. A screw hole into which the terminal screw 41 is screwed is formed in the upper plate 40a. The vertical plate 40b is formed by being bent at a substantially right angle from the outer edge of the upper plate 40a to the lower side. The lower plate 40c is formed by being bent at a substantially right angle from the lower edge of the vertical plate 40b toward the inside, and is formed in a U shape by the upper plate 40a, the vertical plate 40b, and the lower plate 40c. The weld piece 40d is formed by being bent at a substantially right angle from the inner edge of the upper plate 40a toward the upper side. When the screw terminal 9 is fitted into the mounting groove 5d from the inside (left side in FIG. 9A), the side edges of the upper plate 40a, the vertical plate 40b, and the lower plate 40c abut against the inner surface of the mounting groove 5d. . The protective wall 5e is provided with a claw 5f for locking the upper portion of the weld piece 40d, and a locking hook 5g for locking the vertical plate 40b on the side wall of the mounting groove 5d. Thus, when the terminal plate 40 is fitted into the mounting groove 5d, the claw 5f and the locking hook 5g are locked with the weld piece 40d and the vertical plate 40b, respectively, thereby preventing the terminal plate 40 from coming off. Further, in the state where the screw terminal 9 is fitted in the mounting groove 5d, the side edges of the upper plate 40a, the vertical plate 40b, and the lower plate 40c abut against the inner surface of the mounting groove 5d. Even if rotational torque is applied to the plate 40, the terminal plate 40 becomes difficult to turn, and the screw tightening strength is improved.

  In the present embodiment, the two screw terminals 9 for power connection are attached only to the upper pedestal portion 5b. However, if it is desired to output a contact signal for operation monitoring as described later, the lower stage It is only necessary to attach two screw terminals for contact signal output.

  As shown in FIG. 1, the housing 2 includes an interlocking piece 11 including an interlocking rod 10, an operation handle 12, a driving member 13, a link 14, a latch member 15, an electromagnet device 16, and an excitation. A circuit board 30 on which a circuit is mounted is accommodated. The housing 2 also houses a movable contact plate 17 and fixed contact plates 18a and 18b whose conduction state is switched according to the operation of the drive member 13. In addition, a display member 20 and a display latch member 21 are housed inside the housing 2 in order to display the operation state of the external trip device 1.

  The operation handle 12 is supported so as to be rotatable about a rotating shaft 12 a supported at both ends by the body 3 and the cover 4. The operation handle 12 is integrally provided with an operation portion 12b exposed to the outside from a window hole 2a formed on the upper surface of the housing 2 (see FIG. 4), and the operation portion 12b is operated to operate the rotation shaft 12a as a center. Rotate to. The operation portion 12 b has a square bar-like connecting rod 12 c protruding from the surface of the circuit breaker 50 connected to the operation handle 53, and the connecting rod 12 c is inserted into the hole of the operation handle 53. As a result, the operation handle 12 rotates together with the operation handle 53. The operation handle 12 always receives a force in a rotating direction (counterclockwise when viewed from the front in FIG. 1) by an opening spring (not shown).

  The interlocking piece 11 is made of a synthetic resin molded product, and both ends of the interlocking piece 11 are attached so as to be rotatable about a shaft 11 a held by the housing 2. One end side of the metal interlocking rod 10 is held by the interlocking piece 11, and the other end side of the interlocking rod 10 projects forward. The cover 4 is formed with an arc-shaped slit 4a centered on the shaft 11a, and the other end side of the interlocking rod 10 is exposed to the outside of the cover 4 from the slit 4a (see FIG. 4A). When the interlocking piece 11 rotates, the interlocking rod 10 moves in the slit 4a according to the rotation of the interlocking piece 11.

  When the external trip device 1 is mounted side by side on the circuit breaker 50, the interlocking rod 10 is inserted into the body 51 of the circuit breaker 50, and the interlocking rod 10 drives the opening / closing mechanism of the circuit breaker 50. Thus, the contact of the circuit breaker 50 can be turned off. When the user moves the operation handles 12 and 53 of the external trip device 1 and the circuit breaker 50 to the on position, the contact of the circuit breaker 50 is switched on by the open / close mechanism of the circuit breaker 50 and the external trip The movable contact 17a comes into contact with the fixed contact 19a by the driving member 13 of the apparatus 1, and the interlocking rod 10 moves to the position shown in FIG. On the other hand, when an abnormality in the power supply voltage is detected by the external trip device 1 and the interlocking rod 10 moves to the position shown in FIG. 3A, the interlocking rod 10 drives the opening / closing mechanism of the circuit breaker 50, and the contact is Can be switched off.

  The body 3 is also formed with an arcuate slit (not shown) at the same position as the slit 4a. When this external trip device 1 is connected to an external trip device 1 that detects other abnormality of the power supply voltage (for example, an undervoltage abnormality), the interlocking rod 10 of the other external trip device 1 is connected to the body 3. It is inserted into the hole (not shown) of the interlocking piece 11 through the slit. When an abnormality in the power supply voltage is detected by another external trip device 1 and the interlocking rod 10 of the other external trip device 1 is moved to the off position, the interlocking piece 11 of the own machine is thereby moved to the off position. In addition, the switching mechanism of the circuit breaker 50 connected to the own device can be turned off.

  As shown in FIGS. 1 and 8, the drive member 13 includes a drive lever 24 made of synthetic resin and a metal bearing bracket 25. The drive lever 24 is formed in a horizontally long plate shape. On one end side of the drive lever 24, a round bar-like protrusion 24e and a hole 24f for passing the shaft 23 fixed to the housing 2 are provided. The drive lever 24 is provided with a recess 24d having a reduced thickness around the hole 24f. Further, on the other end side of the drive lever 24, a protrusion 24 a that engages with a bent portion of the movable contact plate 17 and protrusions 24 b and 24 c that press an intermediate portion of the movable contact plate 17 are provided. On the other hand, the bearing fitting 25 is provided with a hole 25b for allowing the protrusion 24e to pass therethrough and a hole 25c continuing to the hole 24f during assembly. The bearing fitting 25 is press-fitted and fixed in the recess 24d with the projection 24e passing through the hole 25b, and is passed through the holes 24f and 25c in a state where the drive lever 24 and the bearing fitting 25 are assembled together. Attached so as to be rotatable around the shaft 23.

  The link 14 is formed in a U shape by bending both ends of a metal round bar in the same direction. One end of the link 14 is inserted into the hole 12 d of the operation handle 12. The other end of the link 14 is inserted into a link hole 22 formed by the bearing fitting 25 of the drive member 13 and the latch member 15, and this state is a state in which the link 14 is latched by the latch member 15. In this latched state, the movement of the operation handle 12 is transmitted to the drive member 13 via the link 14. On the other hand, when the drive member 13 is driven by the electromagnet device 16 and the drive member 13 and the latch member 15 rotate relatively so that the link hole 22 is opened, the other end of the link 14 comes out of the link hole 22. The latch of the link 14 is released.

  The drive member 13, the latch member 15, and the display member 20 are rotatably supported via a shaft 23 that is held at both ends by the housing 2. Both ends of a torsion coil spring (not shown) are locked to the latch member 15 and the display member 20, respectively, and the spring force in the clockwise direction is applied to the latch member 15 and the display member 20 is counterclockwise. Spring force in the direction of rotation is applied respectively. Further, the driving member 13 constantly receives a force in a direction of rotating counterclockwise by a spring (not shown).

  The display latch member 21 is supported so as to be rotatable about an axis projecting from the inner wall of the body 3, and a force in a clockwise direction is constantly applied by a spring (not shown). Here, in the OFF state shown in FIG. 1A, the upper end portion of the display latch member 21 comes into contact with the stepped portion 20 a provided on the lower side of the display member 20 from the lower side, so that the display member 20 is warped. It cannot be rotated clockwise. In the off state and the on state, a portion displaying the normal state is exposed on the display member 20 from the window hole 2b (see FIG. 4D) opened on the upper surface of the housing 2.

  A circuit board 30 is housed inside the housing 2. Mounted on the circuit board 30 are an electromagnet device 16 that drives the latch member 15 in response to energization of the coil, and an exciter circuit component that excites the coil 32 of the electromagnet device 16 when an abnormality in the power supply voltage is detected. .

  The electromagnet device 16 includes a synthetic resin bobbin 31, a coil 32, a fixed iron core 33, a holder member 34, a movable iron core 35, and a return spring 36 formed of a coil spring.

  The bobbin 31 is formed in a cylindrical shape having flanges 31a at both ends, and a coil 32 is wound a plurality of times between the flanges 31a on both sides. The specifications such as the number of turns of the coil 32 can be appropriately changed according to the current for exciting the coil 32 and the required electromagnetic attraction force.

  As shown in FIGS. 1 and 10, the fixed iron core 33 is formed in a U shape when viewed from the front side with a magnetic material (for example, iron or the like). One leg piece 33 a of the fixed iron core 33 is inserted into the hole of the bobbin 31, and the tip of the leg piece 33 a is exposed from the flange 31 a of the bobbin 31. A return spring 36 is inserted into the other leg piece 33 b of the fixed iron core 33.

  As shown in FIGS. 1 (a) and 10, the holder member 34 is rotatably attached to a flange 31a where the tip of the leg piece 33a is exposed. The movable iron core 35 formed in the above is held. The holder member 34 is rotatably mounted around a shaft 34a held by the flange portion 31a, the position where the movable iron core 35 abuts on the distal end surfaces (magnetic pole surfaces) of the leg pieces 33a and 33b, and the leg pieces 33a and 33b. It rotates between the position where the movable iron core 35 leaves | separates from the front end surface (magnetic pole surface). Here, the movable iron core 35 protrudes outward (upper side) by a length D1 from the upper edge of the front end surface of the leg piece 33a, and is outward (lower side) by a length D2 from the lower edge of the front end surface of the leg piece 33b. ) Is set so that it overhangs. That is, the movable iron core 35 is set to have a dimension that projects outward from the tip surfaces (magnetic pole surfaces) of the leg pieces 33a and 33b. Therefore, as compared with the case where the end edge of the movable core 35 and the end edges of the leg pieces 33a and 33b are aligned (that is, when the lengths D1 and D2 are zero), the magnetic pole surface of the fixed core 33 is removed. The area of the movable iron core 35 that receives the magnetic flux that is generated increases, and the magnetic attractive force increases.

  The movable contact plate 17 is formed by bending a belt plate made of a conductive material (for example, stainless steel) having high elasticity at an intermediate portion, and the movable contact 17a is fixed to both surfaces on one end side. On the other end side of the movable contact plate 17, a weld piece 17 b welded to the weld piece 40 d of the terminal plate 40 is formed by bending the tip portion outward as viewed from the bent portion.

  Fixed contacts 19a and 19b are fixed to the fixed contact plates 18a and 18b, respectively. The fixed contact plate 18a is connected to one output end of the excitation circuit via a lead wire 38. The fixed contact plate 18a is disposed at a position where the fixed contact 19a comes into contact with the movable contact 17a fixed to the upper surface of the movable contact plate 17 in the ON state shown in FIG. The fixed contact plate 18b is disposed at a position where the fixed contact 19b contacts the movable contact 17a fixed to the lower surface of the movable contact plate 17 in the OFF state shown in FIG. When the movable contact 17a is in conduction with the upper fixed contact 19a, the coil 32 is connected between the output ends of the excitation circuit, and an excitation current can flow through the coil 32. On the other hand, when the movable contact 17a is in conduction with the lower fixed contact 19b, the coil 32 is not connected between the output ends of the excitation circuit, and the excitation current cannot flow through the coil 32. Note that two screw terminals for contact signal output, which are electrically connected to the fixed contact plates 18a and 18b, respectively, can be attached to the lower step portion of the terminal block 5. If two screw terminals for contact signal output are added, a contact signal indicating the switching state of the contact composed of the fixed contacts 19a and 19b and the movable contact 17a (that is, whether the contact is on or off) can be output to the outside. it can.

  The movable contact plate 17 is driven by the drive member 13, but the drive lever 24 that constitutes the drive member 13 is provided with a protrusion 24 a that engages with the bent portion of the movable contact plate 17. Further, the drive lever 24 is provided with a protrusion 24b that presses the intermediate portion of the movable contact plate 17 in the ON state (the portion between the tip portion where the movable contact 17a is fixed and the bent portion) upward. When the protrusion 24b pushes the intermediate portion of the movable contact plate 17 upward in the ON state, the contact pressure between the movable contact 17a and the fixed contact 19a is secured. The drive lever 24 is provided with a protrusion 24c that presses the intermediate portion of the movable contact plate 17 downward in the off state. When the protrusion 24c pushes the intermediate portion of the movable contact plate 17 downward in the off state, the contact pressure between the movable contact 17a and the fixed contact 19b is secured.

  Next, the operation of the external trip device 1 will be described with reference to FIGS.

  FIG. 1A shows a state in which the operation handle 12 is operated to the off position. In this state, the contact of the circuit breaker 50 connected to the external trip device 1 is in an off state. The operation handle 12 rotates counterclockwise under the spring force of the opening spring and moves to the off-state position shown in FIG. The movement of the operation handle 12 is transmitted to the latch member 15 via the link 14. When the latch member 15 is pulled by the link 14, the latch member 15 rotates counterclockwise against the spring force, and the link hole 22. Is open upward. The drive member 13 receives a spring force and rotates counterclockwise, and stops at a position where it abuts on the rib 3 b of the body 3. At this time, when the movable contact plate 17 is pushed downward by the protrusion 24b of the drive member 13, the movable contact plate 17 is elastically deformed, and the movable contact 17a on the lower side comes into contact with the fixed contact 19b. Further, the interlocking piece 11 is rotated counterclockwise against the spring force by being pushed by the projection 25a of the bearing fitting 25, and is held at the position shown in FIG. At this time, the interlocking rod 10 moves through the slit 4a to the upper end position. The display member 20 receives a spring force and rotates counterclockwise, and stops at a position where the stepped portion 20a contacts the display latch member 21. In this state, the display member 20 displays a normal state from the window hole 2b. The part of is exposed. Further, since the coil 32 of the electromagnet device 16 is not energized and no electromagnetic attractive force is generated, the holder member 34 receives the spring force of the return spring 36 and rotates counterclockwise, and FIG. Stop at the position.

  Thereafter, when the user rotates the operation handles 12 and 53 clockwise, the bearing fitting 25 of the drive member 13 is pushed by the link 14 and the drive member 13 rotates clockwise. If one end side of the link 14 exceeds the dead center on the straight line connecting the shaft 12a of the operation handle 12 and the link hole 22 into which the other end side of the link 14 is inserted, the operation handle 12 and 53 are continuously rotated. It stops in a state where the other end is pressed against the end face of the bearing fitting 25. At this time, the operation handle 12 and the link 14 are held at the position shown in FIG. 1B, and the circuit breaker 50 is turned on. At this time, the latch member 15 receives the spring force of the torsion coil spring and rotates to a position where it abuts against the other end side of the link 14. Further, when the projection 20b of the display member 20 is pushed by the driving member 13, the display member 20 rotates clockwise and moves to the display reset position. In this state, the display latch member 21 receives a spring force and moves to a position where the display member 20 can be latched. Further, the interlocking piece 11 rotates clockwise in accordance with the rotation of the driving member 13 (or by being pushed by a part of the latch member 15 that rotates clockwise), and the interlocking rod 10 is positioned at the lower end position of the slit 4a. Move up. Further, when the protrusion 24b of the driving member 13 pushes the movable contact plate 17 upward, the movable contact plate 17 is elastically deformed, and the movable contact 17a on the upper side comes into contact with the fixed contact 19a. At this time, the switch provided in the excitation circuit and the coil 32 are connected in series between the pair of screw terminals 9. In addition, since the coil 32 of the electromagnet device 16 is not energized and no electromagnetic attractive force is generated, the holder member 34 receives the spring force of the return spring 36 and rotates counterclockwise.

  When the excitation circuit detects an overvoltage state in which the power supply voltage exceeds a predetermined set value higher than the rated voltage in this on state, the excitation circuit is connected in series to the coil 32 to trip the circuit breaker 50. A switch (for example, a thyristor element) is turned on. When the switch is turned on and the coil 32 is energized, an electromagnetic attractive force is generated between the distal end surfaces of the leg pieces 33a and 33b of the fixed iron core 33 and the movable iron core 35, and the holder member 34 is shown in FIG. Rotate clockwise as shown in a). When the holder member 34 rotates clockwise, the protrusion 15 b of the latch member 15 is pushed by the protrusion 34 b of the holder member 34, the latch member 15 rotates counterclockwise, and the end surface of the latch member 15 is the other end of the link 14. Leave the department. At this time, the link 14 rotates counterclockwise around one end supported by the operation handle 12, and the other end of the link 14 is disengaged outside the link hole 22. The member 13 receives the spring force of the opening spring, rotates counterclockwise, and moves to the position shown in FIG. Further, the interlocking piece 11 is pushed upward by the projection 25a of the driving member 13 and the interlocking rod 10 moves to the upper end position of the slit 4a. Therefore, the opening / closing mechanism of the circuit breaker 50 is driven by the interlocking rod 10, and the opening / closing mechanism The contact is turned off. Thereby, the power supply to the load device connected to the circuit breaker 50 is interrupted, and the load device can be protected. Further, when the display latch member 21 is pushed by the protrusion 34b of the holder member 34 and rotates counterclockwise, the latch of the display member 20 is released. The display member 20 rotates counterclockwise under the spring force of the return spring, and rotates to a position where the abnormality is displayed in the window hole 2b (a position shown in FIG. 2B). Further, when the driving member 13 rotates counterclockwise, the movable contact plate 17 is pushed downward by the protrusion 24c of the driving member 13, and the movable contact 17a moves away from the upper fixed contact 19a, and the lower fixed contact. 19a (see FIG. 3A). At this time, since the energization to the coil 32 is interrupted when the movable contact 17a is separated from the fixed contact 19a, the electromagnetic attractive force acting between the fixed iron core 33 and the movable iron core 35 is lost, and the holder member 34 is restored to the return spring 36. It rotates counterclockwise under the spring force of.

  Thereafter, the operation handle 12 receives the spring force of the opening spring, rotates counterclockwise, and moves to the position shown in FIG. At this time, the other end side of the link 14 (the side opposite to the side supported by the operation handle 12) is inserted into the link hole 22 surrounded by the drive member 13 and the latch member 15, and the operation handle 12 is moved to the clockwise direction. When it is rotated around and moved to the ON position, the state shown in FIG.

  As described above, the external trip device 1 of the present embodiment is arranged in connection with the circuit breaker 50 having one or more poles, and an abnormality in the power supplied to the load via the circuit breaker 50 is detected. Sometimes the circuit breaker 50 is turned off. The housing 2 of the external trip device 1 is attached so as to be connected to the body 51 of the circuit breaker 50. Housed in the housing 2 are an interlocking rod 10, an operation handle (operation unit) 12, a drive member 13, a link 14, a latch member 15, and an electromagnet device 16. A part of the interlocking rod 10 protrudes from the side surface facing the circuit breaker 50 in the housing 2, and the contact of the circuit breaker 50 is turned off at the protruding portion. The operation handle 12 is exposed to the outside from the front surface of the housing 2. The drive member 13 is rotatably supported by the housing 2 and drives the interlocking rod 10 (in this embodiment, the interlocking piece 11 that holds the interlocking rod 10). One end of the link 14 is supported by the operation handle 12 and transmits the movement of the operation handle 12 to the drive member 13. The latch member 15 latches the other end side of the link 14 with the drive member 13. The electromagnet device 16 drives the latch member 15 when the voltage of the power supply is abnormal, and releases the other end side of the link 14 from between the latch member 15 and the drive member 13 to the outside, so that the drive member 13 is moved by the spring force of the return spring. Move away from the interlocking rod 10. The electromagnet device 16 includes a coil 32, a fixed iron core (stator) 33, a movable iron core (movable element) 35, and a holder member 34. The coil 32 is energized by a power source connected to a screw terminal (connecting terminal) 9 provided in the housing 2, and is switched between being excited or not when the power source voltage is abnormal. A portion of the fixed iron core 33 is passed through the center of the coil 32. The movable iron core 35 is attracted to the magnetic poles of the fixed iron core 33 when the coil 32 is excited. The holder member 34 is rotatably arranged while holding the movable iron core 35, and drives the latch member 15 when the power supply voltage is abnormal. The housing 2 is provided with a groove 2c into which the mounting rail 60 is inserted on the surface opposite to the front surface where the operation portion of the operation handle 12 is exposed. The electromagnet device 16 has a winding axis direction of the coil 32 as the front surface. It is housed inside the housing 2 so as to be parallel.

  Since the operation part of the operation handle 12 is exposed from the front surface of the housing 2, the interlocking rod 10, the operation handle 12, the drive member 13, the link 14, and the latch member 15 are located inside the housing 2 on the side close to the front surface. Stored. Therefore, when the electromagnet device is accommodated so that the winding axis direction of the coil 32 is along the front-rear direction, it is necessary to downsize the electromagnet device in the winding axis direction, but the winding axis direction is parallel to the front surface. Since the electromagnet device is arranged, the size of the electromagnet device 16 can be increased in the winding axis direction of the coil 32. Therefore, since it is not necessary to bend a part of the fixed iron core 33 in order to reduce the size of the electromagnet device, the manufacturing cost of the electromagnet device 16 can be reduced, and thereby the manufacturing cost of the external trip device 1 can be reduced.

  Further, in the present embodiment, the coil 32 is so arranged that the latch member 15 is driven by the holder member 34 when the power supply voltage input to the screw terminal 9 (connection terminal) exceeds a predetermined set value higher than the rated voltage. An excitation circuit for switching whether or not to excite is provided.

  Thereby, when the power supply voltage is in an overvoltage state, the circuit breaker 50 is cut off, so that the load connected to the circuit breaker 50 can be protected.

  In the present embodiment, the first and second fixed contacts 19a and 19b, one of which is electrically connected to the coil 32, and the movable contact plate 17 are further provided. One end side of the movable contact plate 17 is disposed between the first and second fixed contacts 19a and 19b, the movable contact 17a is provided on both sides of the one end side, and other than the terminal plate 40 of the screw terminal 9 (connection terminal). The end side is fixed by welding. The movable contact plate 17 is in a state where one movable contact 17a is in contact with the first fixed contact 19a or the other movable contact 17a is in contact with the second fixed contact 19b according to the rotation of the drive member 13. Can be switched to. The movable contact plate 17 is folded between one end side and the other end side, and the portion of the movable contact plate 17 welded and fixed to the weld piece 40d of the terminal plate 40 is bent outward as viewed from the folded portion. Yes.

  By the way, if the portion of the movable contact plate 17 that is welded and fixed to the weld piece 40d of the terminal plate 40 is bent inward as viewed from the folded portion, the movable contact plate 17 becomes an obstacle and the movable contact plate 17 The work of bringing the welding electrode close to the welding site becomes difficult. On the other hand, in this embodiment, the site | part welded and fixed to the welding piece 40d of the terminal plate 40 in the movable contact plate 17 is bent outside seeing from the folding | turning part. As a result, when the welding electrode is brought close to the welded part of the movable contact plate 17, parts other than the welded part of the movable contact plate 17 do not get in the way, and the welded part can be easily sandwiched from both sides by the welding electrode. Therefore, welding work becomes easy.

  In the present embodiment, the driving member 13 is provided with a protrusion 24a (first protrusion) and protrusions 24b and 24c (second protrusion and third protrusion). The protrusion 24 a is engaged with the folded portion of the movable contact plate 17. The protrusion 24b pushes the movable contact plate 17 toward the fixed contact 19a when one movable contact 17a contacts the fixed contact (first fixed contact) 19a. The protrusion 24c pushes the movable contact plate 17 toward the fixed contact 19b when the other movable contact 17a contacts the fixed contact (second fixed contact) 19b.

  Here, when the position of the folded portion of the movable contact plate 17 is fixed, only the portion ahead of the folded portion (that is, between one end side where the movable contact 17a is provided and the folded portion) is bent. . For this reason, the length of the effective portion of the movable contact plate 17 with respect to the bending is shortened, and the stress generated by the bending is increased. Therefore, it is necessary to use an expensive material for the movable contact plate 17. On the other hand, in the present embodiment, the driving member 13 is provided with a protrusion 24a that engages with the folded portion, and the position of the protrusion 24a also changes according to the rotational operation of the driving member 13, so that the entire movable contact plate 17 is provided. Will bend. Therefore, since the movable contact plate 17 can take a long effective portion for bending, the stress generated by the bending is reduced, and an inexpensive material can be used for the movable contact plate 17.

  In the present embodiment, the connection terminal (screw terminal 9) includes a terminal screw 41 and a terminal plate 40 to which the terminal screw 41 is fastened. The terminal plate 40 includes an upper plate 40a (first plate piece) having a screw hole, a lower plate 40c (second plate piece) disposed at a distance from the upper plate 40a in the thickness direction, an upper plate 40a, and a lower plate 40a. At least a vertical plate 40b (third plate piece) connecting between the plates 40c is provided. A plurality of the upper plate 40a, the vertical plate 40b, and the lower plate 40c are held by the casing (in this embodiment, the inner surface of the mounting groove 5d of the terminal block 5) from the direction intersecting the axial direction of the terminal screw 9. Has been.

  As a result, the side edges of the upper plate 40a, the vertical plate 40b, and the lower plate 40c come into contact with the inner surface of the mounting groove 5d, respectively, so that even if a force for rotating the terminal plate 40 is applied by tightening the terminal screw 41, The terminal board 40 becomes difficult to turn and the screw tightening strength is improved.

  In the present embodiment, the mover (movable iron core 35) is provided so as to protrude outward from the magnetic pole surface of the stator (fixed iron core 33). In particular, the movable iron core 35 is provided such that an end edge on the side far from the rotation center of the holder member 34 projects outward from the magnetic pole surface of the fixed iron core 33.

  Thereby, the area of the site | part of the movable iron core 35 which receives the magnetic flux which emerges from the magnetic pole surface of the fixed iron core 33 becomes large, and magnetic attraction force can be strengthened.

  In the present embodiment, the drive member 13 is a combination of a molded product (drive lever 24) formed of synthetic resin and a metal component (bearing bracket 25) in which at least a portion in contact with the link 14 is formed of metal. It is configured.

  The portion of the drive member 13 that comes into contact with the link 14 may be worn by the movement of the link 14 according to the operation of the operation handle 12. However, since the portion that comes into contact with the link 14 is made of a metal part, it is worn out. It is hard to do, and durability improves. In addition, compared with the case where the entire drive member 13 is formed of resin, a portion requiring strength can be formed in a small size by partially using metal parts, and thus the drive member 13 can be downsized as a whole. .

  It should be noted that a circuit breaker having a desired number of poles can be realized by connecting a plurality of circuit breakers 50 together. The operation handles 53 of the plurality of connected circuit breakers 50 are connected to each other, and the operation handles 53 of the circuit breakers 50 are moved together. Therefore, when the circuit breaker 50 having one or more poles is connected to the circuit breaker 50 connected to the external trip device 1, the circuit breaker adjacent to the external trip device 1 when the power supply voltage is abnormal. By turning off 50, all the poles of the circuit breaker 50 can be turned off.

(Embodiment 2)
An external trip device 1 of Embodiment 2 will be described with reference to FIGS.

  In this embodiment, the circuit breaker 50 is turned off when an undervoltage state in which the power supply voltage falls below a predetermined set value (Uunder, for example, 35% to 70% of the rated voltage) lower than the rated voltage (Ue) is detected. An external trip device 1 having an excitation circuit will be described. Since the components other than the electromagnet device 16 and the driving member 13 are the same as those in the first embodiment, the same components are denoted by the same reference numerals and the description thereof is omitted.

  Similarly to the first embodiment, the drive member 13 includes a synthetic resin drive lever 24 and a metal bearing bracket 25. The drive member 13, the latch member 15, and the display member 20 are rotatably supported via a shaft 23 that is held at both ends by the housing 2. As shown in FIGS. 13A and 13B, the drive member 13 always receives a force in a counterclockwise direction by a return spring 27 made of a coil spring and a return spring 29 made of a torsion coil spring. ing. One end of each of the return springs 27 and 29 is locked to the rib of the body 3, and the other end of the return springs 27 and 29 is locked to the drive member 13. As shown in FIG. 13B, a spring force in a direction of rotating counterclockwise by the opening spring 28 is constantly applied to the operation handle 12. Further, the display latch member 21 always receives a force in a direction of rotating clockwise by the torsion coil spring 37.

  The electromagnet device 16 includes a synthetic resin bobbin 31, a coil 32, a fixed iron core 33, a holder member 34, a movable iron core 35, and a return spring 36 formed of a coil spring.

  The fixed iron core 33 is formed in a U shape when viewed from the front side with a magnetic material (for example, iron or the like). One (lower) leg piece of the fixed iron core 33 is inserted into the hole of the bobbin 31, and the tip of the leg piece is exposed from the flange 31 a of the bobbin 31. A return spring 36 is inserted into the other leg piece (upper side) of the fixed iron core 33.

  As shown in FIG. 11 (a), the holder member 34 is rotatably attached to a flange 31a where the tip of the leg piece of the fixed iron core 33 is exposed. The movable iron core 35 formed in the above is held. The holder member 34 is attached to be rotatable about a shaft 34a held by the flange 31a. The holder member 34 has a position where the movable iron core 35 abuts on the tip surfaces (magnetic pole surfaces) of both leg pieces, and the tip surfaces ( It can be rotated between the position where the movable iron core 35 is separated from the magnetic pole surface. Similar to the first embodiment, the movable iron core 35 is set to have a dimension that projects outward from the tip end surface of the leg piece of the fixed iron core 33, and therefore, the movable iron core 35 that receives the magnetic flux emitted from the magnetic pole surface of the fixed iron core 33. The area of the region becomes larger, and the magnetic attractive force can be increased.

  In this embodiment, the movable contact plate 17 and the fixed contact plates 18a and 18b are not provided, and the coil 32 of the electromagnet device 16 is connected to the screw terminal 9 via a switch provided in the excitation circuit. Thus, whether the coil 32 is excited or not is switched by turning on / off the switch provided in the excitation circuit. The excitation circuit obtains an operating power source from a power source connected to the screw terminal 9.

  The operation of the external trip device 1 will be described with reference to FIGS.

  FIG. 11A shows a state in which the operation handle 12 is operated to the off position. In this state, the contact of the circuit breaker 50 connected to the external trip device 1 is in the off state. The operation handle 12 receives the spring force of the opening spring 28, rotates counterclockwise, and moves to the off-state position shown in FIG. The movement of the operation handle 12 is transmitted to the latch member 15 via the link 14. When the latch member 15 is pulled by the link 14, the latch member 15 rotates counterclockwise against the spring force, and the link hole 22. Is open upward. The driving member 13 receives the spring force of the return springs 27 and 29, rotates counterclockwise, and stops at a position where it abuts against a rib (not shown) of the body 3. Further, when the interlocking piece 11 is pushed by the projection 25a of the bearing fitting 25, it rotates counterclockwise against the spring force and is held at the position shown in FIG. At this time, the interlocking rod 10 moves to the upper end position in the slit 4a. The display member 20 receives a spring force and rotates counterclockwise, and stops at a position where the stepped portion 20a contacts the display latch member 21. In this state, the display member 20 displays a normal state from the window hole 2b. The part of is exposed. Further, when the protrusion 34c at the tip of the holder member 34 is pushed by the protrusion 24d (see FIG. 13B) on the back surface of the drive member 13 (drive lever 24), the holder member 34 rotates counterclockwise. The movable iron core 35 is held at a position in contact with the magnetic pole surface of the fixed iron core 33.

  Thereafter, when the user rotates the operation handles 12 and 53 clockwise, the bearing fitting 25 of the drive member 13 is pushed by the link 14 and the drive member 13 rotates clockwise. If one end side of the link 14 exceeds the dead center on the straight line connecting the shaft 12a of the operation handle 12 and the link hole 22 into which the other end side of the link 14 is inserted, the operation handle 12 and 53 are continuously rotated. It stops in a state where the other end is pressed against the end face of the bearing fitting 25. At this time, the operation handle 12 and the link 14 are held at the positions shown in FIG. 11B, and the circuit breaker 50 is turned on. Further, the latch member 15 receives the spring force of the torsion coil spring and rotates to a position where it abuts on the other end side of the link 14. Further, when the projection 20b of the display member 20 is pushed by the driving member 13, the display member 20 rotates clockwise and moves to the display reset position. In this state, the display latch member 21 receives a spring force and moves to a position where the display member 20 can be latched. Further, the interlocking piece 11 rotates clockwise in accordance with the rotation of the driving member 13 (or by being pushed by a part of the latch member 15 that rotates clockwise), and the interlocking rod 10 is positioned at the lower end position of the slit 4a. Move up. If the power supply voltage is normal in the on state, the coil 32 is energized by the excitation circuit, and the movable iron core 35 is attracted to the fixed iron core 33, so that the holder member 34 resists the spring force of the return spring 36. It is in the state rotated to the position of FIG. In this state, the protrusion 34 c at the tip of the holder member 36 has moved to a position away from the drive member 13.

  When the excitation circuit detects that the power supply voltage is below a predetermined set value lower than the rated voltage in this ON state (undervoltage condition), the excitation circuit trips the circuit breaker 50 to The switch connected in series to 32 is turned off. At this time, the energization of the coil 32 is stopped, and the electromagnetic attractive force generated between the fixed iron core 33 and the movable iron core 35 is lost. Therefore, the holder member 34 receives the spring force of the return spring 36, as shown in FIG. Rotate clockwise. When the holder member 34 rotates clockwise, the protrusion 15a of the latch member 15 is pushed on the tip side of the holder member 34, the latch member 15 rotates counterclockwise, and the end face of the latch member 15 is the other end of the link 14. Leave the department. When the end surface of the latch member 15 is separated from the other end portion of the link 14, the link 14 rotates counterclockwise around the one end side supported by the operation handle 12. At this time, since the other end side of the link 14 is disengaged outside the link hole 22, the drive member 13 that has lost the support of the link 14 receives the spring force of the return springs 27 and 29 and rotates counterclockwise. (A) Move to position (b). Further, the interlocking piece 11 is pushed upward by the protrusion 25a of the driving member 13 and the interlocking rod 10 moves to the upper end position of the slit 4a, so that the opening / closing mechanism of the circuit breaker 50 is driven by the interlocking rod 10 and the opening / closing mechanism. The contact is turned off by. Thereby, the power supply to the load device connected to the circuit breaker 50 is interrupted, and the load device can be protected. The holder member 34 receives the spring force of the return spring 36 and rotates clockwise. However, when the tip of the projection 34c comes into contact with the projection 24d of the drive member 13, the spring force of the return springs 27 and 29 is restored. Since it is set larger than the spring force of 36, it cannot be rotated further clockwise. When the driving member 13 receives the spring force of the return springs 27 and 29 and rotates counterclockwise, the tip of the protrusion 34c is pushed by the protrusion 24d, whereby the holder member 34 rotates counterclockwise and is movable. The iron core 35 moves to a position where it comes into contact with the magnetic pole surface of the fixed iron core 33.

  Further, when the display latch member 21 is pushed by the projection 34c of the holder member 34 and rotates counterclockwise, the latch of the display member 20 is released. When the latch is released, the display member 20 receives the spring force of the return spring and rotates counterclockwise until the position where the abnormality is displayed is desired in the window hole 2b (the position shown in FIG. 14A). Rotate. When the operation handle 12 receives the spring force of the opening spring and rotates counterclockwise and moves to the off position, the other end side of the link 14 is opened to the opening of the link hole 22 as shown in FIG. It is inserted into the inside of the link hole 22 through and moves to the position shown in FIGS. 15 (a) and 15 (b). At this time, the other end side of the link 14 (the side opposite to the side supported by the operation handle 12) is inserted into the link hole 22 surrounded by the drive member 13 and the latch member 15, and the operation handle 12 is moved to the clockwise direction. When it is rotated around and moved to the ON position, the state shown in FIG.

  In the present embodiment, the switch for switching the excitation state of the electromagnet device 16 is omitted, and the power supply voltage becomes lower than the rated voltage, so that the current passed through the electromagnet device 16 is reduced, and the fixed iron core 33 and the movable iron core 35 are reduced. The holder member 34 can also be rotated clockwise by reducing the electromagnetic attraction force generated during the period.

  As described above, in the present embodiment, the latch member 15 is driven by the holder member 34 when the power supply voltage input to the connection terminal (screw terminal 9) falls below a predetermined set value lower than the rated voltage. An excitation circuit for switching whether to excite the coil 32 is provided.

  Thereby, when the power supply voltage becomes an undervoltage state, the circuit breaker 50 is cut off, so that the load connected to the circuit breaker 50 can be protected. In the above embodiment, since the power supply is always energized (when the power supply voltage is not insufficient, the coil 32 of the electromagnet device 16 is energized), the coil 32 is excited when the power supply voltage is insufficient. The latch member 15 is driven accordingly.

(Embodiment 3)
An external trip device 1 of Embodiment 3 will be described with reference to FIGS.

  In the present embodiment, an excitation circuit for performing a trip operation is not provided, and whether or not the coil 32 is excited is switched by a signal input to the connection terminal from an external detection device (not shown).

  The external trip device 1 of the present embodiment does not include the circuit board 30, and the fixed contact plate 18a is connected to one end of the coil 32 through the lead wire 39a. Further, the screw terminal 9 to which the movable contact plate 17 is not connected is connected to the other end of the coil 32 through the lead wire 39b. Therefore, between the pair of screw terminals 9, the coil 32 and the contact portion composed of the movable contact plate 17 and the fixed contact plate 18 a are connected in series. In addition, since it is the same as that of Embodiment 1 except the point where the circuit board 30 is not provided, the same code | symbol is attached | subjected to a common component and the description is abbreviate | omitted.

  In the present embodiment, when it is determined that the external detection device satisfies a certain condition such as an abnormality in the power supply voltage, an excitation current is supplied from the external detection device to the coil 32 via the screw terminal 9.

  The operation of the external trip device 1 will be described with reference to FIGS.

  FIG. 16A shows a state in which the operation handle 12 is operated to the off position. In this state, the contact of the circuit breaker 50 connected to the external trip device 1 is in the off state. The operation handle 12 receives the spring force of the opening spring, rotates counterclockwise, and moves to the off-state position shown in FIG. The movement of the operation handle 12 is transmitted to the latch member 15 via the link 14. When the latch member 15 is pulled by the link 14, the latch member 15 rotates counterclockwise against the spring force, and the link hole 22. Is open upward. The drive member 13 receives a spring force and rotates counterclockwise, and stops at a position where it abuts on the rib 3 b of the body 3. At this time, when the movable contact plate 17 is pushed downward by the protrusion 24b of the drive member 13, the movable contact plate 17 is elastically deformed, and the movable contact 17a on the lower side comes into contact with the fixed contact 19b. In this state, the coil 32 is not connected between the pair of screw terminals 9 and 9, and the coil 32 cannot be energized. Since the coil 32 of the electromagnet device 16 is not energized and no electromagnetic attractive force is generated, the holder member 34 receives the spring force of the return spring 36 and rotates counterclockwise, as shown in FIG. Stop at position. Further, the interlocking piece 11 rotates counterclockwise against the spring force by being pushed by the projection 25a of the bearing fitting 25, and is held at the position shown in FIG. At this time, the interlocking rod 10 moves through the slit 4a to the upper end position. The display member 20 receives a spring force and rotates counterclockwise, and stops at a position where the stepped portion 20a contacts the display latch member 21. In this state, the display member 20 displays a normal state from the window hole 2b. The part of is exposed.

  Thereafter, when the user rotates the operation handles 12 and 53 clockwise, the bearing fitting 25 of the drive member 13 is pushed by the link 14 and the drive member 13 rotates clockwise. If one end side of the link 14 exceeds the dead center on the straight line connecting the shaft 12a of the operation handle 12 and the link hole 22 into which the other end side of the link 14 is inserted, the operation handle 12 and 53 are continuously rotated. It stops in a state where the other end is pressed against the end face of the bearing fitting 25. At this time, the operation handle 12 and the link 14 are held at the positions shown in FIG. 16B, and the circuit breaker 50 is turned on. The latch member 15 receives the spring force of the torsion coil spring and rotates to a position where it abuts on the other end side of the link 14. Further, when the projection 20b of the display member 20 is pushed by the driving member 13, the display member 20 rotates clockwise and moves to the display reset position. In this state, the display latch member 21 receives a spring force and moves to a position where the display member 20 can be latched. Further, the interlocking piece 11 rotates clockwise in accordance with the rotation of the driving member 13 (or by being pushed by the latch member 15 that rotates clockwise), and the interlocking rod 10 moves to the lower end position of the slit 4a. Further, when the protrusion 24b of the driving member 13 pushes the movable contact plate 17 upward, the movable contact plate 17 is elastically deformed, and the movable contact 17a on the upper side comes into contact with the fixed contact 19a. At this time, the coil 32 is connected between the pair of screw terminals 9, and the coil 32 can be energized. When the power supply voltage is normal, the coil 32 is not energized and no electromagnetic attractive force is generated. Therefore, the holder member 34 rotates counterclockwise due to the spring force of the return spring 36.

  In this ON state, when the external detection device detects a certain condition such as a power supply voltage abnormality (overvoltage abnormality or undervoltage abnormality) or a push button operation, the screw terminals 9, 9 are tripped to trip the circuit breaker 50. Supply excitation current to At this time, the coil 32 is energized through the screw terminal 9, and an electromagnetic attractive force is generated between the distal end surfaces of the leg pieces 33a and 33b of the fixed iron core 33 and the movable iron core 35. Rotate clockwise as shown in a). When the holder member 34 rotates clockwise, the protrusion 15 b of the latch member 15 is pushed by the protrusion 34 b of the holder member 34, the latch member 15 rotates counterclockwise, and the end surface of the latch member 15 is the other end of the link 14. Leave the department. At this time, the link 14 rotates counterclockwise around the one end side supported by the operation handle 12, and the other end portion of the link 14 is disengaged outside the link hole 22. The driving member 13 receives the spring force of the opening spring, rotates counterclockwise, and moves to the position shown in FIG. Further, the interlocking piece 11 is pushed upward by the projection 25a of the driving member 13 and the interlocking rod 10 moves to the upper end position of the slit 4a. Therefore, the opening / closing mechanism of the circuit breaker 50 is driven by the interlocking rod 10, and the opening / closing mechanism The contact is turned off. Thereby, the power supply to the load device connected to the circuit breaker 50 is interrupted, and the load device can be protected. Further, when the display latch member 21 is pushed by the protrusion 34b of the holder member 34 and rotates counterclockwise, the latch of the display member 20 is released. The display member 20 rotates counterclockwise in response to the spring force of the return spring, and rotates to the position where the abnormality is displayed in the window hole 2b (the position shown in FIG. 17B). Further, when the driving member 13 rotates counterclockwise, the movable contact plate 17 is pushed downward by the protrusion 24c of the driving member 13, and the movable contact 17a moves away from the upper fixed contact 19a, and the lower fixed contact. 19a is contacted. At this time, since the energization to the coil 32 is interrupted when the movable contact 17a is separated from the fixed contact 19a, the electromagnetic attractive force acting between the fixed iron core 33 and the movable iron core 35 is lost, and the holder member 34 is restored to the return spring 36. It rotates counterclockwise under the spring force of.

  Thereafter, the operation handle 12 receives the spring force of the opening spring and rotates counterclockwise, and moves to the off position as shown in FIG. At this time, the other end side of the link 14 (the side opposite to the side supported by the operation handle 12) is inserted into the link hole 22 from the opening of the link hole 22 as shown in FIG. As shown in (b), the drive member 13 and the latch member 15 are in a latched state. Thereafter, when the operation handle 12 is rotated clockwise and moved to the on position, the state shown in FIG.

  As described above, in this embodiment, whether or not the coil 32 is excited is switched by a signal input to the connection terminal (screw terminal 9) from an external detection device that detects whether the power supply voltage is abnormal or normal. It is like that.

  As a result, it is possible to turn off the connected circuit breaker 50 in response to a signal from an external detection device, so that the load connected to the circuit breaker 50 can be protected.

DESCRIPTION OF SYMBOLS 1 External trip device 2 Case 2c Groove 3 Body 4 Cover 5 Terminal block 9 Screw terminal (connection terminal)
10 Interlocking bar 11 Interlocking piece 12 Operation handle (operation part)
13 Drive member 14 Link 15 Latch member 16 Electromagnet device 32 Coil 33 Fixed iron core (stator)
33a, 33b Leg piece 34 Holder member 35 Movable iron core (movable element)
50 Circuit breaker 51 Body 60 Mounting rail

Claims (9)

An external trip device for a circuit breaker that is arranged in connection with a circuit breaker having one or more poles and that turns off the circuit breaker when a voltage of a power source supplied to a load via the circuit breaker is abnormal Because
In the inside of the housing attached to be connected to the body of the circuit breaker,
A part of the housing protrudes from the side facing the circuit breaker, and an interlocking rod that turns off the contact of the circuit breaker at the protruding portion;
An operation unit in which an operation part is exposed to the outside from the front surface of the housing;
A drive member that is rotatably supported by the housing and drives the interlocking rod;
A link having one end side supported by the operation unit and transmitting the movement of the operation unit to the drive member;
A latch member that latches the other end side of the link with the drive member;
When the voltage of the power supply is abnormal, the latch member is driven, and the other end side of the link is released to the outside from between the latch member and the drive member, whereby the drive member is released from the interlocking rod by a spring force of a return spring. The electromagnet device that moves in the direction of leaving is stored,
The electromagnet device is energized by a power source connected to a connection terminal provided in the casing, and a coil that is switched between being excited or not when the power source voltage is abnormal or normal, and at the center of the coil A stator that is at least partially passed, a mover that is attracted to the magnetic poles of the stator when the coil is excited, and is rotatably disposed to hold the mover, and when the voltage of the power supply is abnormal A holder member for driving the latch member,
The housing is provided with a groove into which a mounting rail is inserted on a surface opposite to the front surface where the operation part of the operation unit is exposed,
2. The circuit breaker external trip device according to claim 1, wherein the electromagnet device is housed in the housing so that a winding axis direction of the coil is parallel to the front surface.   An excitation circuit for switching whether to excite the coil so that the latch member is driven by the holder member when a power supply voltage input to the connection terminal exceeds a predetermined set value higher than a rated voltage. An external trip device for a circuit breaker according to claim 1, further comprising:   An excitation circuit for switching whether to excite the coil so that the latch member is driven by the holder member when a power supply voltage input to the connection terminal falls below a predetermined set value lower than a rated voltage. An external trip device for a circuit breaker according to claim 1, further comprising:   2. An external trip device for a circuit breaker according to claim 1, wherein whether or not the coil is excited is switched by a signal inputted to the connection terminal from an external detection device. A first and a second fixed contact, one of which is electrically connected to the coil;
One end side is disposed between the first and second fixed contacts, a movable contact is provided on both sides of the one end side, and the other end side is provided with a movable contact plate fixed to the connection terminal by welding,
The movable contact plate is in a state where one of the movable contacts is in contact with the first fixed contact or the other of the movable contacts is in contact with the second fixed contact according to the rotation of the driving member. Switched to
The movable contact plate is folded between one end side and the other end side, and a portion of the movable contact plate welded and fixed to the connection terminal is bent outward as viewed from the folded portion. Item 4. The circuit breaker external trip device according to any one of Items 2 and 3.   The drive member includes a first protrusion that engages with a folded portion of the movable contact plate, and the movable contact plate is moved to the first fixed contact when one of the movable contacts contacts the first fixed contact. A second projection that pushes the movable contact plate toward the second fixed contact when the other movable contact contacts the second fixed contact. An external trip device for a circuit breaker according to claim 4. The connection terminal includes a terminal screw and a terminal plate to which the terminal screw is fastened.
The terminal plate includes a first plate piece having a screw hole, a second plate piece arranged at a distance from the first plate piece in a thickness direction, and the first plate piece and the second plate piece. And at least a third plate piece for connecting
The plurality of the first to third plate pieces are held by the housing from a direction intersecting an axial direction of the terminal screw. Circuit breaker external trip device.   The external trip device for a circuit breaker according to any one of claims 1 to 7, wherein the mover is provided so as to project outward from a magnetic pole surface of the stator.   9. The drive member according to claim 1, wherein the drive member is configured by combining a molded product formed of a synthetic resin and a metal part formed of metal at least in contact with the link. An external trip device for a circuit breaker according to item 1.

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