KR20240000676U - Adjustable Trip Device of Molded Case Circuit Breaker - Google Patents

Abstract

The present invention relates to a temporary adjustment trip device for a molded circuit breaker, and in particular, to a temporary adjustment trip device for a molded case circuit breaker capable of rated overcurrent temporary adjustment operation and instantaneous current temporary adjustment operation.
According to the present invention, the ratings of the overcurrent trip unit and the instantaneous current trip unit can be temporarily adjusted, so it can be applied to a wide range of rated currents.

Description

Adjustable Trip Device of Molded Case Circuit Breaker}

The present invention relates to a temporary adjustment trip device for a molded circuit breaker, and in particular, to a temporary adjustment trip device for a molded case circuit breaker capable of rated overcurrent temporary adjustment operation and instantaneous current temporary adjustment operation.

In general, a molded case circuit breaker (MCCB) is an electrical device that protects circuits and loads by automatically blocking the circuit in the event of an electrical overload or short circuit. Molded case circuit breakers are usually used in low-voltage systems.

A molded circuit breaker is largely comprised of a terminal part that can be connected to the power source or the load side, a contact part that includes a fixed contactor and a movable contactor that connects or disconnects the circuit by contacting or separating it, and an opening and closing part that provides the power necessary to open and close the circuit by moving the movable contactor. It consists of a trip part that detects overcurrent or short-circuit current flowing in the mechanism and circuit and induces a trip operation of the opening/closing mechanism, and an arc extinguishing part to extinguish the arc that occurs when abnormal current is blocked.

Fault current can be divided into various ways. Usually, a current exceeding 130% of the rated current is called an overcurrent, and a sudden current exceeding 10 times the rated current is called an instantaneous fault current. Additionally, sudden large currents, including instantaneous currents, are called short-circuit currents.

In the overcurrent area, a method of tripping a circuit breaker using a bimetal element is commonly used, and an instantaneous current of about 10 times the rated current is generated by placing a conductor between a magnet and an armature and applying a current greater than the set current to the conductor. When the current flows, a magnetic path is formed and the armature is attracted to the magnet, tripping the circuit breaker.

In this way, the molded circuit breaker includes an overcurrent trip device corresponding to the rated overcurrent and an instantaneous trip device corresponding to the instantaneous current.

Figure 1 shows a fixed-rated current circuit breaker according to the prior art. Commonly, it is called a molded circuit breaker. To facilitate internal understanding, the enclosure is shown in a cut state and parts unrelated to the content of the invention are deleted.

The molded circuit breaker (10) according to the prior art includes a mechanical part (20) that provides the power necessary to open and close the circuit by moving a movable contactor, and a trip device that senses overcurrent or fault current flowing in the circuit and causes a trip operation of the switching mechanism. Includes part 30. If a fault current occurs during current application, the trip unit 30 detects it and operates the mechanism unit 20 to cause a cutoff. The trip unit 30 and the mechanism unit 20 are connected by a crossbar 50.

Figure 2 shows the detailed structure of the trip unit 30. The trip unit 30 includes an overcurrent trip device and an instantaneous current trip device.

The overcurrent trip device includes a heater 33 that is connected to the terminal 31 to store heat, a bimetal 35 that is coupled to the heater 33 and curves when the heat rises, and moves in conjunction with the bimetal 35 to move the crossbar 50. ) includes a gap adjustment screw (37) that rotates.

The instantaneous trip device includes a magnet 43 fixedly installed on the support part 41 and an armature 45 rotatably installed on the support part 41. Here, the armature 45 is spaced apart from the magnet 43 in a normal current passing state.

The process by which an overcurrent trip occurs is as follows. The bimetal 35 is curved due to the heat accumulated in the heater 33, and the gap adjustment screw 37 coupled to the bimetal 35 operates to push the crossbar 50, causing the crossbar 50 to rotate counterclockwise. I do it. And when it rotates more than a certain angle, the latch holder 21 is released and a blocking operation of the mechanical part 20 occurs.

In addition, the process in which an instantaneous current trip, which is a relatively large fault current of more than 10 times the rated current, occurs is as follows.

When a fault current occurs, an induced current is generated in the magnet 43 to form a magnetic field, and thus the armature 45 is attracted to the magnet 43. As the armature 45 rotates, the pressurizing part 46 rotates the crossbar 50 counterclockwise to release the latch holder 21 and the mechanism part 20 operates.

However, in the molded circuit breaker according to the prior art. There is a need to adjust the gap of the gap adjustment screw 37 in contact with the contact plate 51 of the crossbar 50.

In addition, since the fault current of the rated overcurrent trip unit and the instantaneous current trip unit is fixed to a certain value, there is a problem in that the customer must change the breaker if the rated current or instantaneous current exceeds the setting range.

Although not shown separately, in the case of products such as rated provisionally adjustable circuit breaker trip units, a provisionally adjustable crossbar may be added separately, but this is inconvenient.

The present invention was developed to solve the above-mentioned problem, and its purpose is to provide a tripping device for a molded circuit breaker having an overcurrent trip unit and an instantaneous current trip unit whose rating can be temporarily adjusted.

Specifically, in the overcurrent trip unit, a crossbar whose distance from the gap adjustment screw is adjusted is provided.

In addition, an instantaneous crossbar is provided in which the gap between the armature and the magnet is adjusted in the instantaneous trip unit.

A provisional trip device for a molded circuit breaker according to an embodiment of the present invention includes a trip unit including an overcurrent trip unit that operates when an overcurrent occurs and an instantaneous trip unit that operates when a short circuit current occurs; a crossbar that rotates due to the action of the trip unit; and an opening/closing mechanism that opens the circuit when released from the restraint of the crossbar, and further includes an overcurrent adjustment dial that moves the crossbar to adjust the rating of the overcurrent trip portion, and to adjust the rating of the instantaneous trip portion, an instantaneous crossbar that adjusts the position of the armature provided in the instantaneous trip unit; and an instantaneous adjustment dial that rotates the instantaneous crossbar.

Here, the overcurrent trip unit includes a heater connected to a portion of the circuit; A bimetal coupled to the heater and curved by heat; It includes a gap adjustment screw that is coupled to the bimetal and moves together to rotate the crossbar.

In addition, the instantaneous trip unit includes a magnet installed on the support portion; and the armature, which is rotatably installed on the support and spaced apart from the magnet at a predetermined distance.

Additionally, the crossbar has a contact plate contacting the gap adjustment screw,

The contact plate includes a first contact part formed as a plane and a second contact part formed as an inclined surface.

Additionally, a dial locking portion is formed on the crossbar, and a mover inserted into the dial locking portion is formed on the overcurrent adjustment dial.

Additionally, a first toothed portion is formed on the magnet, and a second toothed portion engaging the first toothed portion is formed on the armature.

Additionally, the instantaneous adjustment dial is provided with an instantaneous adjustment portion formed as a polygonal surface with different diameters from the center.

And, the instantaneous crossbar includes a contact protrusion that contacts the instantaneous adjustment dial; and a transmission unit contacting the armature.

According to the present invention, the ratings of the overcurrent trip unit and the instantaneous current trip unit can be temporarily adjusted, so it can be applied to a wide range of rated currents.

The overcurrent trip unit provides a crossbar whose distance from the gap adjustment screw is adjusted and the distance between the crossbar and the gap adjustment screw is adjusted by adjusting the overcurrent dial.

In addition, the instantaneous trip unit is provided with an instantaneous crossbar to adjust the gap between the armature and the magnet.

1 is a diagram showing the internal structure of a molded circuit breaker according to the prior art.
Figure 2 is a trip unit of a molded circuit breaker according to the prior art.
Figure 3 is an internal structural diagram of a molded circuit breaker according to an embodiment of the present invention.
Figures 4 and 5 are a perspective view and a top view of the trip portion and crossbar portion of a molded circuit breaker according to an embodiment of the present invention.
Figure 6 is a perspective view of the trip unit of a molded circuit breaker according to an embodiment of the present invention.
Figure 7 is a perspective view of a crossbar of a molded circuit breaker according to an embodiment of the present invention.
Figure 8 is a perspective view of an overcurrent dial of a molded circuit breaker according to an embodiment of the present invention.
Figure 9 is a perspective view of an instantaneous crossbar of a molded circuit breaker according to an embodiment of the present invention.
Figure 10 is a perspective view of an instantaneous dial of a molded circuit breaker according to an embodiment of the present invention.
11 and 12 show the operation of the overcurrent trip unit of the molded circuit breaker according to an embodiment of the present invention.
13 and 14 show the operation of the instantaneous current trip unit of the molded circuit breaker according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, this is intended to provide a detailed description so that a person with ordinary knowledge in the technical field to which the present invention belongs can easily implement the design, and these drawings mean that the technical idea and scope of the present invention are limited. That is not the case.

The terms “member” or “part” used to refer to components in the present invention are not used for any limiting purpose and may be omitted.

Figure 3 is an internal structural diagram of a molded circuit breaker according to an embodiment of the present invention. Figures 4 and 5 are perspective and top views of the trip unit and crossbar. A molded circuit breaker having an press-trip device according to an embodiment of the present invention will be described in detail with reference to the drawings.

A provisional trip device for a molded case breaker according to an embodiment of the present invention includes a trip unit 200 including an overcurrent trip unit that operates when an overcurrent occurs and an instantaneous trip unit that operates when a short circuit current occurs; A crossbar 230 that rotates by the action of the trip unit 200; and an opening/closing mechanism unit 102 that opens the circuit when released from the restraint of the crossbar 230, and further includes an overcurrent adjustment dial 245 that moves the crossbar to adjust the rating of the overcurrent trip unit, In order to adjust the rating of the instantaneous trip unit, an instantaneous crossbar 265 that adjusts the position of the armature 280 provided in the instantaneous trip unit; And it further includes an instantaneous adjustment dial 290 that rotates the instantaneous crossbar 265.

The enclosure 101 accommodates and supports the components of the molded circuit breaker 100. The enclosure 101 is roughly shaped like a box. A handle 103 is exposed on the upper surface of the enclosure 101. The handle 103 operates the opening and closing mechanism 102 by the user's manual manipulation force.

Terminal portions 108 and 109 that can be connected to a power source or a load are provided on the front and rear sides of the enclosure 101. Terminal portions 108 and 109 are provided for each phase (or each pole). For example, in the case of a three-phase, four-pole molded circuit breaker, four terminal units may be provided on each of the power and load sides. The terminal portions 108 and 109 may be divided into a power terminal portion 108 and a load terminal portion 109.

A fixed contactor 105 is fixedly installed inside the enclosure 101. The fixed contactor 105 is connected to the power supply side terminal portion 108. The fixed contact 105 may be formed integrally with the power supply side terminal portion 108.

The fixed contact 105 is provided with a fixed contact point 106. The fixed contact point 106 may be made of a material with excellent electrical conductivity and durability, such as silver (Ag) alloy.

The user's operating force is transmitted to the opening and closing mechanism 102 through the handle 103. In order to transmit the power of the opening and closing mechanism 102 to each phase, the opening and closing mechanism 102 is provided with a shaft assembly 120. The shaft assembly 120 may be configured as an integrated piece in which each phase is integrated. Alternatively, a shaft assembly 120 may be provided for each phase and connected with a pin to drive it integrally.

As the shaft assembly 120 rotates, the movable contact 122 also rotates to contact or separate from the fixed contact 105.

The movable contact 122 is rotatably installed on the shaft body 121. The movable contactor 122 rotates counterclockwise or clockwise together with or independently of the shaft body 121 and contacts or separates from the fixed contactor 105 to energize or block the line.

Each end of the movable contactor 122 is provided with a movable contact point 123 that can be contacted with the fixed contact point 106 of the fixed contactor 105. The movable contact point 123 may be made of a material with excellent electrical conductivity and durability, such as silver (Ag) alloy.

The movable contactor 122 rotates together with the shaft body 121 in a general low-current or large-current blocking situation, but when the current is blocked, the movable contactor 122 rotates independently due to a rapid electromagnetic repulsion force. In this case, the movable contact 122 comes into contact with the shaft pin (not shown) of the opening 127 and stops rotating.

When the shaft assembly 120 is rotated by the opening/closing mechanism 102 and the movable contact point 123 of the movable contactor 122 contacts the fixed contact point 106 of the fixed contactor 105, the current on the power supply side is transmitted to the power supply terminal portion 108. ), fixed contactor 105, movable contactor 122, connection terminal 205, heater 211, and load side terminal portion 109.

Let's further refer to the trip unit in FIG. 6 and the crossbar in FIG. 7.

A trip unit (trip device, 200) is provided inside the enclosure 101 to detect abnormal current flowing in the circuit and trip the opening/closing mechanism. The trip unit 200 is usually provided on the load side.

The trip unit 200 includes an overcurrent trip unit and an instantaneous trip unit.

The overcurrent trip unit includes a heater 211 installed on the support part 225 and connected to the load side terminal 109, a bimetal 215 that is coupled to the heater 211 to detect heat and is curved according to the amount of heat, and the bimetal 215. The gap adjustment screw 220 coupled to the upper portion, the crossbar 230 installed to rotate by contact with the gap adjustment screw 220, and the opening and closing mechanism 102 are restrained or released by rotation of the crossbar 230. It may include a nail 240 that restrains or releases the latch holder 108.

Normally, when a small current is delayed and cut off, the bimetal 215 is curved by the heat generated in the heater 211 and the crossbar 230 rotates to operate the opening/closing mechanism 102.

The instantaneous trip unit includes a magnet 270 installed on the support part 225, an armature 280 rotatably installed on the support part 225, and the crossbar 230.

When a large current is momentarily cut off, the armature 280 is attracted by the magnetic force excited by the magnet 270 and the crossbar 230 is rotated to operate the opening/closing mechanism 102.

First, let's look at the overcurrent trip unit in detail.

The support unit 225 is installed with components of an overcurrent trip unit and an instantaneous trip unit.

The heater 211 and the bimetal 215 are coupled to the front of the support portion 225, and the magnet 270 is coupled to the rear of the support portion 225. An insertion groove 226 on which the armature 280 is placed is formed on the upper part of the support portion 225.

The heater 211 is coupled to the support portion 225. The heater 211 may be coupled to the support portion 225 along with the magnet 270 and the bimetal 215 using screws or the like.

The heater 211 is connected to the load side terminal portion 109 through a connecting member 213. A connection terminal 205 is coupled to the bottom of the heater 211. The heater 211 serves as a current path flowing from the power supply side terminal portion 108 to the load side terminal portion 109. The heater 211 accumulates heat according to the amount of current flowing in the circuit.

The bimetal 215 is coupled to the heater 211. The bimetal 215 is composed of two metals with different thermal conductivities and is curved when heat is generated. The bimetal 215 is curved when heat accumulates in the heater 211.

The gap adjustment screw 220 is coupled to the upper part of the bimetal 215. The gap adjustment screw 220 is formed in a screw shape and can move forward and backward. That is, the gap between the gap adjustment screw 220 and the crossbar 230 is adjusted. Accordingly, adjustment of the rated current is also possible. The gap adjustment screw 220 may contact the crossbar 230 to rotate the crossbar 230.

The crossbar 230 is disposed between the trip unit 200 and the opening/closing mechanism unit 102, and rotates under the action of the trip unit 200 to operate the opening/closing mechanism unit 102 when a fault current occurs.

The crossbar 230 has an axial hole 231 formed therethrough so as to rotate about the crossbar axis. A crossbar shaft (not shown) is inserted into the shaft hole 231.

The crossbar 230 is provided with a nail installation portion 232 so that the nail 240 that restrains the latch holder 110 can be coupled thereto.

The crossbar 230 is provided with a dial locking portion 234 into which the overcurrent adjustment dial 245 can be inserted. The dial locking portion 234 may be formed in an '11' shape. The overcurrent adjustment dial 245 is inserted into the dial locking portion 234, and when the overcurrent adjusting dial 245 rotates, the dial locking portion 234 is pushed so that the crossbar 230 moves linearly in the axial direction.

The crossbar 230 is provided with a contact plate 235 with which the bimetal 215 contacts. A contact plate 235 is provided for each phase. When the gap adjustment screw 220 touches the rear of the contact plate 235, the crossbar 230 rotates about the crossbar axis.

The contact plate 235 is provided with a first contact part 236 formed as a flat surface and a second contact part 237 formed as an inclined surface on the rear side.

Within the range of the first contact portion 236, the distance from the gap adjustment screw 220 is constant.

Within the range of the second contact portion 237, the gap changes depending on the contact position with the gap adjustment screw 220. When the crossbar 230 moves along the axial direction, the gap increases or decreases depending on the surface of the second contact portion 237 that the gap adjustment screw 220 touches.

In order to respond to various rated currents, the gap between the crossbar 230 and the gap adjustment screw 220 is adjusted. This overcurrent interval adjustment mechanism includes an overcurrent adjustment dial 245 and a crossbar 230.

10 shows the overcurrent adjustment dial.

The overcurrent adjustment dial 245 includes a display portion 246 exposed to the upper cover 104 of the enclosure 101, and a mounting portion 247 that protrudes below the upper cover 104 to prevent it from being separated from the enclosure 101. , It includes a mover 248 that is inserted into the dial locking portion 234 and moves the crossbar 230.

The mover 248 is inserted into the dial locking portion 234 of the crossbar 230 and moves the crossbar 230 according to the rotation of the overcurrent adjustment dial 245. Accordingly, the portion of the contact plate 235 of the crossbar 230 that contacts the gap adjustment screw 220 changes, and the distance between the crossbar 230 and the gap adjustment screw 220 is adjusted.

Next, let's look at the instantaneous trip unit.

The magnet 270 is magnetized when a rapid current flow occurs around the heater 211 and generates a magnetic field. The magnet 270 may be formed in a 'ㄷ' shape. That is, side parts are formed on both sides.

A first toothed portion 272 is formed on the side of the magnet 270 toward the armature 280.

The armature 280 is rotatably installed on the support portion 225. The armature 280 is installed in the insertion groove 226 of the support portion 225 and is rotatable.

The armature 280 is formed of a magnetic material. The armature 280 is spaced apart from the magnet 270 at a predetermined distance by receiving the force of the return spring 289. When the magnetic force of the magnet 270 increases and overcomes the force of the return spring 289, the armature 280 is attracted to the magnet 270 and rotates.

The armature 280 has a second tooth portion 282 formed on a side surface that engages the first tooth portion 272. A first toothed portion 272 is formed in the magnet 270 and a second toothed portion 282 is formed in the armature 280, so that the effect of magnetic force increases as the adjacent area increases.

The armature 280 is provided with a ring portion 284 that the transmission portion 268 of the instantaneous crossbar 265 touches.

The armature 280 is provided with an instantaneous pressing portion 286 that rotates the crossbar 230. When the armature 280 rotates and the instantaneous pressurizing part 286 pushes the contact plate 235 of the crossbar 230, the crossbar 230 rotates and a trip of the opening and closing mechanism occurs.

To adjust the instantaneous spacing, the spacing between the magnet 270 and the armature 280 is adjusted. This instantaneous gap adjustment mechanism includes an instantaneous adjustment dial 290 and an instantaneous crossbar 265.

Figure 8 shows an instantaneous adjustment dial.

The instantaneous adjustment dial 290 includes an instantaneous display portion 291 exposed to the upper cover 104 of the enclosure 101, an instantaneous mounting portion 292 that prevents it from coming off from under the upper cover 104, and an instantaneous crossbar 265. It includes an instantaneous control unit 293 that moves.

The instantaneous control unit 293 has a polygonal surface. Here, the polygonal surface is formed by faces with different distances from the center. For example, polygonal surfaces are sequentially formed with increasing distance from the center.

In Figure 9 an instantaneous crossbar is shown.

An instantaneous crossbar 265 is provided to adjust the position of the armature 280.

The instantaneous crossbar 265 has a body portion 266 formed in a length reaching each phase, a contact protrusion 267 in contact with the instantaneous adjustment dial 290, and a transmission portion 268 connected to the armature 280.

The position of the contact protrusion 267 is determined by contacting the instantaneous adjustment portion 293 of the instantaneous adjustment dial 290. When the instantaneous adjustment dial 290 rotates, it comes into contact with the polygonal surface of the instantaneous adjustment unit 293, so the instantaneous crossbar 265 rotates to push the armature 280.

The transmission portion 268 of the instantaneous crossbar 265 is in contact with the ring portion 284 of the armature 280. The transmission unit 268 contacts the ring portion 284 of the armature 280 to set the position of the armature 280. In a general energized state, the armature 280 is spaced apart from the magnet 270 at a predetermined distance. In this case, the transmission unit 268 of the instantaneous crossbar 265 sets the gap by limiting the rotational position of the armature 280. As the instantaneous crossbar 265 rotates and the position at which the transmission unit 268 fixes the armature 280 changes, the distance between the armature 280 and the magnet 270 changes.

11 to 14 show the operation of the provisional tripping device of the molded circuit breaker.

First, let's look at how to adjust the overcurrent rating with reference to FIGS. 11 and 12.

When the overcurrent adjustment dial 245 is rotated, the dial locking portion 234 of the mover 248 is pushed to move the crossbar 230 in the axial direction.

11 shows the gap adjustment screw 220 facing the first contact portion 236.

12 shows the gap adjustment screw 220 facing the second contact portion 237.

The user adjusts the gap between the crossbar 230 and the gap adjustment screw 220 by adjusting the position of the contact plate 235 of the crossbar 230. Accordingly, the rated current can be adjusted in case of an overcurrent trip.

Next, we will look at a method of adjusting the instantaneous current rating with reference to FIGS. 4 and 5 and FIGS. 13 and 14.

When the user turns the instantaneous adjustment dial 290, the instantaneous adjustment unit 293, which touches the contact protrusion 267 of the instantaneous crossbar 265, rotates, thereby rotating the instantaneous crossbar 265. As the instantaneous crossbar 265 rotates, the armature 280 rotates and the distance from the magnet 270 is adjusted. For example, Figure 13 shows that the gap between the magnet 270 and the armature 280 is formed at an angle a, and Figure 14 shows that the gap between the magnet 270 and the armature 280 is formed at an angle b. Here, angle a is greater than angle b. The instantaneous current rating capacity varies depending on the gap between the magnet 270 and the armature 280.

The embodiments described above exemplify the best implementation state for implementing the present invention, and those skilled in the art can make various modifications and modifications without departing from the essential characteristics of the present invention. Transformation will be possible. Therefore, these embodiments are not intended to limit the technical idea of the present invention, but are merely for illustrative purposes. Therefore, it should be understood that the scope of the technical idea of the present invention is not limited by these embodiments. In other words, the scope of protection of the present invention should be interpreted in accordance with the claims below, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of rights of the present invention.

101 enclosure
102 opening and closing mechanism
105 fixed contactor
108 Power side terminal section
109 Load side terminal section
120 shaft assembly
122 movable contactor
200 tripbu
211 heater
215 bimetal
220 gap adjustment screw
225 support
230 crossbar
234 Dial catch
235 contact plate
236 first contact
237 second contact
240 nail
245 overcurrent adjustment dial
265 Instantaneous Crossbar
268 Delivery Department
270 magnet
272 1st toothed part
280 amateur
282 2nd tooth part
284 hook
286 Instantaneous pressurization section
290 instantaneous adjustment dial
293 Instantaneous control unit

Claims (8)

A trip unit including an overcurrent trip unit that operates when an overcurrent occurs and an instantaneous trip unit that operates when a short circuit current occurs;
a crossbar that rotates due to the action of the trip unit; and
It includes an opening and closing mechanism that opens the circuit when released from the restraint of the crossbar,
To adjust the rating of the overcurrent trip unit, it further includes an overcurrent adjustment dial that moves the crossbar,
In order to adjust the rating of the instantaneous trip unit, an instantaneous crossbar for adjusting the position of an armature provided in the instantaneous trip unit; and
A temporary adjustment trip device for a molded circuit breaker further comprising an instantaneous adjustment dial for rotating the instantaneous crossbar. The method of claim 1, wherein the overcurrent trip unit,
A heater connected to part of a circuit;
A bimetal coupled to the heater and curved by heat;
A gap adjustment screw coupled to the bimetal and moving together to rotate the crossbar. The method of claim 1, wherein the instantaneous trip unit,
A magnet installed on the support part; and
The armature is rotatably installed on the support portion and spaced apart from the magnet at a predetermined interval. The method of claim 2, wherein the crossbar
Provided with a contact plate in contact with the gap adjustment screw,
The contact plate includes a first contact portion formed in a plane and
A provisional tripping device for a molded circuit breaker including a second contact portion formed as an inclined surface. According to paragraph 1,
A dial catch portion is formed on the crossbar.
A temporary adjustment trip device for a molded circuit breaker wherein the overcurrent adjustment dial is formed with a mover that is inserted into the dial locking portion. According to clause 3,
A first tooth portion is formed in the magnet,
A temporary adjustment trip device for a molded-case circuit breaker, wherein the armature is formed with a second tooth portion that engages the first tooth portion. According to paragraph 1,
A temporary adjustment trip device for a molded circuit breaker, wherein the instantaneous adjustment dial is provided with an instantaneous adjustment portion formed as a polygonal surface with a different diameter from the center. According to paragraph 1,
The instantaneous crossbar is,
a contact protrusion contacting the instantaneous adjustment dial; and
A provisional tripping device for a molded circuit breaker including a transmission portion contacting the armature.

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