JP2012059630A - Contact device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a contact device which can ensure insulation performance, while protecting a housing container from the heat of electric arc.SOLUTION: A contact device comprises: a contact block 1 having a fixed terminal 11 and a movable contact piece 20 housed in a housing container 10; a drive block 2 for driving the movable contact piece 20; a joining member 35 which is fixed to an edge of an opening formed on a face of the housing container 10 opposing to the drive block 2, and which constitutes a sealing member for sealing a housing space where the fixed terminal 11 and the movable contact piece 20 are housed; and a protective member 6 which attracts electric arc so as to protect a joint portion between the housing container 10 and the joining member 35 from electric arc, while at the same time insulating the joint portion. The protective member 6 comprises an insulation member 60 arranged between the movable contact piece 20 and the drive block 2, and a metal member 61 attached to a portion of the insulation member 60 opposing to the movable contact piece 20. A folded piece 61e protruding to the housing container 10 side is provided in a portion of the metal member 61 opposing to a side wall of the housing container 10.

Description

  The present invention relates to a contact device suitable for a power load relay, an electromagnetic switch or the like.

  FIG. 6 shows an example of a conventional contact device, which houses a pair of fixed terminals 11 provided with a fixed contact 11a and a movable contact 20 provided with a movable contact (not shown) that contacts and separates from the fixed contact 11a. The contact block 1 housed in the container 10, the movable shaft 21 with the movable contact 20 fixed to one end side, the movable iron core 31 fixed to the other end side of the movable shaft 21, and the movable shaft 21 are inserted. And a drive block 2 that generates a magnetic attractive force between the fixed core 30 and the movable core 31 to move the movable core 31 to the fixed core 30 side. The drive block 2 includes a coil 41 in which a coil winding is wound around a shaft portion of the coil bobbin 40, and a yoke 42 that surrounds the coil 41. The fixed iron core 30 and the movable iron core 31 are accommodated in a bottomed cylindrical portion 33 formed of a nonmagnetic material into a bottomed cylindrical shape.

  In this contact device, when the coil 41 is excited, the movable iron core 31 moves to the fixed iron core 30 side, so that the movable contact 20 moves to the fixed terminal 11 side together with the movable shaft 21 fixed to the movable iron core 31. The movable contact contacts the fixed contact 11a. Conversely, when the coil 41 is brought into a non-excited state, the magnetic attractive force applied to the fixed iron core 30 side that has been applied to the movable iron core 31 disappears, and the return interposed between the fixed iron core 30 and the movable iron core 31 is restored. Since the movable iron core 31 is pressed to the opposite side of the fixed iron core 30 by the spring force of the spring 32, the movable contact 20 moves in a direction away from the fixed terminal 11 together with the movable shaft 21, and the movable contact opens from the fixed contact 11a. Release.

  By the way, the above-mentioned fixed terminal 11 and movable contact 20 are hermetically formed by a rectangular box-shaped ceramic storage container 10 whose bottom surface is open, a fixed plate 34 connected to a yoke 42 and a bottomed cylindrical portion 33. Although arranged in the space, a joining member 35 for joining the fixing plate 34 to the opening edge of the storage container 10 is brazed. Therefore, for example, when an arc is generated between the movable contact and the fixed contact 11a, the brazing part melts due to the contact of the arc with the brazing part, and the sealing property of the sealed space cannot be ensured. was there. Further, as the generated arc comes into contact with the joining member 35, as shown by an arrow A in FIG. 6, from the joining member 35 to the fixed plate 34, the bottomed cylindrical portion 33, the movable iron core 31, the movable shaft 21, and the movable contact. A current path connected to the fixed contact 11a through the child 20 is formed, and there is a possibility that movable parts such as the movable iron core 31 and the movable shaft 21 are fixed by Joule heat generated by an excessive current flowing in the current path.

  Therefore, a contact device provided with a shield member has been proposed in order to prevent the arc from coming into contact with the brazed portion or the joining member (see, for example, Patent Document 1). The shield member is composed of a thin rectangular box-shaped insulating container made of a synthetic resin molded product and a metal shielding ring that is caulked and fixed to the insulating container. When an arc occurs, the shielding ring generates an arc. By pulling, the arc is prevented from coming into contact with the brazed portion and the joining member.

JP 2010-10056 (paragraph [0021] -paragraph [0023] and FIG. 9)

  In the contact device shown in Patent Document 1 described above, it is intended to prevent the arc from coming into contact with the brazing portion of the storage container and the joining member or the joining member by attracting the arc to the shield ring. When the shield ring is in contact with the brazed portion, the arc attracted to the shield ring contacts the brazed portion and the joining member, and as a result, the brazed portion is melted. In addition, there is a possibility that the movable part may be fixed due to an excessive current flowing through the current path.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a contact device that ensures insulation performance while protecting the storage container from the heat of the arc.

  The contact device of the present invention includes a fixed terminal provided with a fixed contact, a contact block in which a movable contact provided with a movable contact contacting and leaving the fixed contact is accommodated in a storage container, and the movable contact as a fixed contact. A drive block for driving the movable contact so as to contact with or separate from the storage block, and a storage space in which the fixed terminal and the movable contact are stored by being fixed to an opening edge of the storage container having an opening facing the drive block A sealing member that seals, an insulating member disposed between the movable contact and the drive block, and a protective member made of a metal member attached to a portion of the insulating member facing the movable contact, The metal member is provided with a protruding portion that protrudes toward the storage container at a portion facing the side wall of the storage container.

  In this contact device, it is preferable that the metal member is formed in a box shape having an opening on the movable contact side, and the protruding portion is formed by a bent piece in which the opening edge is bent toward the side wall of the storage container.

  In this contact device, it is also preferable that an overhang portion is provided from the end of the bent piece toward the end of the adjacent bent piece.

  Further, in this contact device, the metal member is preferably formed in a box shape having an opening on the movable contact side, and the protruding portion is preferably constituted by a folded piece whose opening edge is folded back to the side opposite to the movable contact.

  In this contact device, the metal member is preferably formed in a shape that covers the entire surface of the insulating member facing the movable contact.

  There is an effect that it is possible to provide a contact device that secures insulation performance while protecting the storage container from arc heat.

It is sectional drawing which shows an example of the contact apparatus which concerns on this invention. The protection member used for the above is shown, (a) is an exploded perspective view, (b) is an enlarged view of the main part in the assembled state, and (c) is an enlarged view of the main part in the assembled state of another protective member. . (A)-(d) is a perspective view which shows the variation of the protection member used for the same as the above. The other variation of the protection member used for the same is shown, (a) is an exploded perspective view, (b) is an external perspective view. The further variation of the protection member used for the same as above is shown, (a) is an exploded perspective view, (b) is an external perspective view. It is sectional drawing which shows an example of the conventional contact device.

  Hereinafter, an embodiment of a contact device according to the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the vertical and horizontal directions are defined in the direction shown in FIG.

  As shown in FIG. 1, the contact device according to the present embodiment includes a pair of fixed terminals 11 provided with a fixed contact 11a, and a movable contact provided with a movable contact portion (movable contact) 20b that contacts and separates from the fixed contact 11a. A contact block 1 in which the child 20 is housed in the storage container 10; and a drive block 2 for driving the movable contact 20 so that the movable contact portion 20b contacts or separates from the fixed contact 11a. 1 and the drive block 2 are accommodated in the container 3 formed in a substantially rectangular box shape.

  The storage container 10 is formed in a box shape whose lower surface is opened by a heat resistant material such as ceramic, and through holes 10a and 10a are provided at two places on the bottom thereof. The fixed terminals 11 and 11 partially inserted into the through holes 10a and 10a are formed in a substantially multi-stage bottomed cylindrical shape with, for example, a copper-based material, and the fixed contact 11a is fixed to the lower end portion. A flange 11b is provided at the upper end. In addition, the fixed terminal 11 is airtightly joined to the storage container 10 by brazing or the like in the vicinity of the flange 11b with the upper end portion protruding from the storage container 10.

  The movable contact 20 is formed, for example, in a flat plate shape using a copper-based material or the like, and is provided with movable contact portions 20b at both left and right end portions with a distance to and from the fixed contact 11a. Further, an insertion hole 20a is provided in the central portion of the movable contact 20, and the upper end portion of the movable shaft 21 formed in a substantially round bar shape by an insulating material is inserted into the insertion hole 20a and caulked to move the movable contact 20. A movable contact 20 is coupled to the shaft 21. The movable contact 20 is applied with an elastic force in a direction (upward) in which the movable contact portion 20b contacts the fixed contact 11a by a contact pressure spring 22 described later.

  A fixed iron core 30 is arranged at an intermediate portion of the movable shaft 21 so as to cover the entire circumference. The fixed iron core 30 is formed in a substantially cylindrical shape having a flange 30b protruding in the radial direction at the upper end, and an insertion hole 30a through which the movable shaft 21 is inserted is formed in the vertical direction (axial direction) at the center of the cross section. It is provided along. The fixed core 30 is arranged so that the upper end is fixed in a state where the fixed core 30 is inserted into an insertion hole 34a of a fixed plate 34, which will be described later, and the lower end is opposed to the upper end of a movable core 31, which will be described later.

  Here, a shock absorber (not shown) made of an elastic material such as silicon rubber that absorbs vibration generated when the movable iron core 31 hits the fixed iron core 30 is attached to the flange portion 30b of the fixed iron core 30, and further A substantially rectangular plate-like cap 36 is attached to the upper side of the shock absorber. The cap 36 is formed into a flat bottomed rectangular tube by processing a plate-shaped metal member, and the fixed plate is inserted in a state where the movable shaft 21 is inserted into the insertion hole 36b provided in the center of the bottom plate. By joining to the upper surface of 34, the fixed iron core 30 is fixed between the bottomed cylinder part 33 mentioned later, and it prevents that the fixed iron core 30 remove | deviates. The rectangular tube portion of the cap 36 constitutes an engaging convex portion 36a that engages with an engaging concave portion 60f provided at the bottom of an insulating member 60 described later.

  A movable iron core 31 is attached to the lower part of the movable shaft 21 so as to cover the entire circumference. The movable iron core 31 is formed in a substantially cylindrical shape, and an insertion hole 31a through which the movable shaft 21 is inserted is provided along the vertical direction (axial direction) at the center of the cross section. The movable core 31 has an upper end facing the lower end of the fixed core 30, and a recess 31 b having an inner diameter larger than the insertion hole 31 a is provided at the lower end. The movable iron core 31 is a sliding surface whose outer peripheral surface slides on the inner peripheral surface of the bottomed cylindrical portion 33.

  The bottomed cylindrical portion 33 is formed of a nonmagnetic material into a bottomed cylindrical shape, and the movable iron core 31 is housed on the bottom side (the lower side in FIG. 1), and the fixed iron core 30 facing the movable iron core 31. Is housed on the opening side (upper side in FIG. 1).

  A return spring 32 is provided in the insertion hole 30 a of the fixed iron core 30 so as to be extrapolated to the movable shaft 21. The lower end of the return spring 32 is in contact with the upper end surface of the movable iron core 31, and the upper end is in contact with the bottom of the cap 36 through an insertion hole provided in an impact absorber (not shown). The return spring 32 is disposed between the movable iron core 31 and the cap 36 in a compressed state, so that an elastic force in a direction away from the fixed iron core 30 (downward) is applied to the movable iron core 31. At the same time, an elastic force is applied downward to the movable shaft 21 fixed to the movable core 31.

  The fixed plate 34 is formed in a substantially rectangular plate shape by a magnetic metal material such as iron and is connected to a yoke 42 described later to form a magnetic circuit together with the fixed core 30 and the movable core 31. The fixing plate 34 is provided with an insertion hole 34 a through which the upper end portion of the fixed iron core 30 is inserted at a substantially center, and the vicinity of the insertion hole 34 a is hermetically joined to the bottomed cylindrical portion 33. In addition, a contact pressure spring 22 made of a compression coil spring is disposed between the fixed plate 34 and the movable contact 20 in a state of being externally attached to the movable shaft 21, and the movable contact portion 20b is connected to the fixed contact 11a. The elastic force in the contact direction (upward direction) is applied to the movable contact 20.

  A joining member 35 is disposed between the storage container 10 and the fixed plate 34 as shown in FIG. The joining member 35 is formed in a cylindrical shape having openings at both ends by a metal material, and the inner peripheral edge of the opening on the upper end side is located inside the inner peripheral surface of the storage container 10. The joining member 35 is hermetically joined at the upper end to the opening end of the storage container 10 and hermetically joined at the lower end to the fixed plate 34. The joining member 35 is hermetically joined to the storage container 10 and the fixed plate 34, thereby forming an airtight space for accommodating the fixed contact 11a and the movable contact portion 20b, the fixed iron core 30 and the movable iron core 31, and hydrogen. Is mainly hermetically sealed in this hermetic space at about 2 atm. Here, in the present embodiment, a sealing member is constituted by the above-described bottomed cylindrical portion 33, the fixing plate 34, and the joining member 35.

  Next, the drive block 2 will be described. The drive block 2 includes a coil 41 in which a coil winding is wound around a shaft portion of a coil bobbin 40, and a yoke 42 that surrounds the coil 41. The yoke 42 is formed in a substantially U shape with a central piece and both opposing pieces, and a through hole 42a through which the bottomed cylindrical portion 33 is inserted is provided in the central piece. The yoke 42 forms a magnetic circuit together with the fixed iron core 30, the movable iron core 31 and the fixed plate 34.

  Here, between the movable contact 20 and the fixed plate 34, the joint portion between the storage container 10 and the joint member 35 is protected and insulated from the arc generated between the fixed contact 11a and the movable contact portion 20b. A protective member 6 is disposed (see FIG. 1). Hereinafter, the protection member 6 will be specifically described.

  The protection member 6 includes an insulating member 60 made of an insulating material such as ceramic or synthetic resin, and a pair of metal members 61 made of a metal material such as iron. As shown in FIG. 2A, the insulating member 60 has a main body portion 60a formed in a horizontally long substantially rectangular plate shape, and a substantially rectangular protruding base portion 60b is integrally formed on the upper surface of the main body portion 60a. Is provided. An insertion hole 60c through which the movable shaft 21 is inserted is provided substantially at the center of the projecting portion 60b. The lower end portion of the contact pressure spring 22 abuts around the insertion hole 60c and a part of the insertion hole 60c is provided. A storage recess 60e for storage is provided. Engagement holes 60d and 60d into which engagement protrusions 61c and 61c (described later) provided on the metal member 61 are inserted are provided on both sides in the left and right direction of the projecting part 60b. Furthermore, a substantially rectangular engagement recess 60f that engages with the engagement protrusion 36a of the cap 36 is provided on the lower surface of the main body 60a (see FIG. 1).

  On the other hand, each metal member 61 is formed in a substantially rectangular box shape provided with protruding walls 61a protruding upward on three sides excluding one side facing the projecting portion 60b of the insulating member 60, and the remaining one side. A pair of engaging projections 61c, 61c projecting toward the insulating member 60 is provided. Each protruding wall 61a is provided with a folded piece 61b formed by folding the opening end thereof downward, that is, on the side opposite to the movable contact 20. And each metal member 61 is attached to the insulating member 60 and the protection member 6 is assembled by inserting the engagement protrusions 61c and 61c provided in each metal member 61 into the corresponding engagement holes 60d and 60d. In addition, in a state where both metal members 61, 61 are attached to the insulating member 60, substantially the entire insulating member 60 facing the movable contact 20 is covered with the metal member 61, and as a result, an arc is formed on the insulating member 60. It is possible to effectively suppress contact.

  Here, FIG. 2B is an enlarged view of a main part showing a state in which the protection member 6 is assembled to the contact device. In this state, the side wall of the storage container 10 and the protruding wall 61a of the metal member 61 by the folded piece 61b. A gap is formed between the metal member 61 and the joint portion between the storage container 10 and the joint member 35. As a result, it is possible to prevent the arc attracted to the metal member 61 from being transmitted to the above-mentioned joining portion, so that the joining portion can be prevented from being melted by the arc, and as indicated by an arrow A in FIG. Since a simple current path is not formed, it is possible to prevent the movable parts such as the movable iron core 31 and the movable shaft 21 from being fixed. Further, for example, even when the metal member 61 is formed of a thin metal material, by providing the folded piece 61b as in this example, it is possible to increase the thickness of the end portion where the arc easily contacts, and as a result. Further, the arc resistance performance can be improved while suppressing the cost increase. Here, as shown in FIG. 2B, the folded piece 61b is set to a size that does not come into contact with the joined portion between the storage container 10 and the joining member 35 in the assembled state. The protrusion 61 is constituted by the piece 61b.

  Next, another variation of the protection member 6 will be described with reference to FIG. In the following description, the description of the same configuration as the protective member 6 described in FIG. FIG. 3A shows a configuration in which a folded piece 61e is provided instead of the folded piece 61b, and the opening end of each protruding wall 61a is bent at a substantially right angle toward the side wall of the storage container 10. The And in the state which assembled | attached this protection member 6 to this contact device, a clearance gap is formed between the protrusion wall 61a of the metal member 61, and the side wall of the storage container 10 by the bending piece 61e (refer FIG. 1), The metal member 61 does not come into contact with the joint portion between the storage container 10 and the joint member 35. Here, in this example, the protruding portion is configured by the bent piece 61e, and similarly, the arc attracted to the metal member 61 can be prevented from being transmitted to the joint portion. Melting can be suppressed, and since a current path as shown by an arrow A in FIG. 6 is not formed, it is possible to prevent the movable parts such as the movable iron core 31 and the movable shaft 21 from being fixed.

  Further, FIG. 3B shows a protruding portion from the end of one bent piece 61e toward the end of each of the adjacent bent pieces 61e, 61e with respect to the metal member 61 described in FIG. 61f and 61f are provided. As a result, the gap formed between the end portions of the adjacent bent pieces 61e, 61e can be closed by the overhanging portion 61f, so that it is possible to suppress the arc from coming into contact with the joint portion through the gap. As compared with the protective member 6 described in FIG. 3A, the arc resistance performance and the insulation performance can be improved. Similarly, since the arc attracted to the metal member 61 can be prevented from being transmitted to the above-mentioned joining portion, the joining portion can be prevented from being melted by the arc, and is further indicated by an arrow A in FIG. Since such a current path is not formed, it is possible to prevent the movable parts such as the movable iron core 31 and the movable shaft 21 from being fixed.

  Further, FIG. 3C shows the remaining one side where the protruding wall 61a is not provided with respect to the metal member 61 shown in FIG. 3B (one side facing the protruding portion 60b of the insulating member 60). Also, the protruding walls 61h and 61h are provided, and as a result, it is possible to further suppress the arc from contacting the insulating member 60. Similarly, since the arc attracted to the metal member 61 can be prevented from being transmitted to the above-mentioned joining portion, the joining portion can be prevented from being melted by the arc, and is further indicated by an arrow A in FIG. Since such a current path is not formed, it is possible to prevent the movable parts such as the movable iron core 31 and the movable shaft 21 from being fixed.

  Heretofore, the case where the folded piece 61b and the bent piece 61e are provided over the entire length of each protruding wall 61a has been described. However, in the assembled state, the side wall of the storage container 10 and the protruding wall 61a of the metal member 61 For example, as shown in FIG. 3D, a bent piece 61g may be provided on a part of each protruding wall 61a. Moreover, although illustration is abbreviate | omitted, the folding piece may be provided in a part of each protrusion wall. Furthermore, the shape of the protrusion is not limited to the folded piece 61b or the folded piece 61e, but may be a protrusion 61d as shown in FIG. 2C. Similarly, the metal member 61 is formed by the protrusion 61d. Since the joint portion between the storage container 10 and the joint member 35 is not contacted, it is possible to prevent the joint portion from being melted by the arc, and a current path as shown by an arrow A in FIG. 6 is not formed. Thus, it is possible to prevent the movable parts such as the movable iron core 31 and the movable shaft 21 from being fixed.

  In addition, the protective member 6 shown in FIGS. 2 and 3 has been described with respect to a case where a pair of two metal members 61 is provided, but may be a single metal member 61 as shown in FIGS. 4 and 5, for example. This will be specifically described below.

  The protection member 6 shown in FIG. 4 includes an insulating member 60 made of an insulating material and a metal member 61 made of a metal material. As shown in FIG. 4A, the insulating member 60 has a main body portion 60a formed in a horizontally long substantially rectangular plate shape, and a circular protrusion 60b is integrally provided on the upper surface of the main body portion 60a. ing. An insertion hole 60c through which the movable shaft 21 is inserted is provided substantially at the center of the projecting portion 60b. The lower end portion of the contact pressure spring 22 abuts around the insertion hole 60c and a part of the insertion hole 60c is provided. A storage recess 60e for storage is provided. Further, a substantially rectangular engagement recess 60f that engages with the engagement protrusion 36a of the cap 36 is provided on the lower surface of the main body 60a (see FIG. 1).

  On the other hand, the metal member 61 is formed in a horizontally-long rectangular box shape whose upper surface (movable contact 20 side) is open, and each of the four protruding walls 61a protruding upward is provided with a folded piece 61b. Protrusions are configured. In addition, a circular insertion hole 61j set to approximately the same size as the above-described protrusion 60b is provided in the center of the main piece of the metal member 61, and the protrusion 60b is inserted into the insertion hole 61j. Then, the metal member 61 is attached to the insulating member 60, and the protective member 6 is assembled (see FIG. 4B).

  5 includes an insulating member 60 and a metal member 61. Note that the insulating member 60 is the same as the insulating member 60 described with reference to FIG. The metal member 61 is formed in a horizontally-long rectangular box shape whose upper surface (movable contact 20 side) is open, and each of the four protruding walls 61a protruding upward is provided with a folded piece 61b. Is configured. In addition, a substantially rectangular insertion hole 61k is provided at the center of the main piece of the metal member 61, and projecting walls 61m and 61m projecting upward are provided at the opening edge of the insertion hole 61k in the left-right direction. ing. Then, the metal member 61 is attached to the insulating member 60 by inserting the protruding portion 60b through the insertion hole 61k, and the protection member 6 is assembled (see FIG. 5B). In this case, since the protruding walls 61m and 61m are provided, it is possible to effectively suppress the arc from contacting the insulating member 60 as compared with the protective member 6 shown in FIG.

  Thus, according to the present embodiment, as described above, the metal member 61 contacts the joint portion between the storage container 10 and the joint member 35 by the protruding portions (the folded piece 61b, the folded pieces 61e and 61g, and the protrusion 61d). Therefore, it is possible to prevent the arc attracted to the metal member 61 from being transmitted to the joint portion. As a result, it is possible to suppress melting of the joining portion due to the arc, and it is possible to prevent the movable portions such as the movable iron core 31 and the movable shaft 21 from being fixed. In addition, since the protective member 6 is composed of two parts, that is, the insulating member 60 and the metal member 61, the width of the material selection of the insulating member can be expanded as compared with the case where the protective member is composed of only the insulating member. As a result, the degree of freedom in design can be increased. Further, when the protruding portion is configured by providing the folded piece 61b or the bent piece 61e on each protruding wall 61a as in the present embodiment, the protruding portion can be formed with a simple configuration.

  In the present embodiment, the metal member 61 is formed by bending. However, for example, drawing may be used, and in this case, the same effect as described above can be obtained. 4 and 5, the case where the protruding portion is the folded piece 61b has been described, but the folded pieces 61e and 61g and the protrusion 61d may be used.

DESCRIPTION OF SYMBOLS 1 Contact block 2 Drive block 6 Protection member 10 Storage container 11 Fixed terminal 20 Movable contact 35 Joining member 60 Insulating member 61 Metal member 61e Bending piece (protrusion part)

Claims (5)

A fixed terminal provided with a fixed contact, and a contact block formed by storing a movable contact provided with a movable contact contacting and leaving the fixed contact in a storage container;
A drive block for driving the movable contact so that the movable contact contacts or separates from the fixed contact;
A sealing member that is fixed to an opening edge of the storage container having an opening facing the drive block and seals a storage space in which the fixed terminal and the movable contact are stored;
An insulating member disposed between the movable contact and the drive block, and a protective member made of a metal member attached to a portion of the insulating member facing the movable contact;
A contact device according to claim 1, wherein a projecting portion projecting toward the storage container is provided at a portion of the metal member facing the side wall of the storage container.   The metal member is formed in a box shape having an opening on the movable contact side, and the protruding portion is configured by a bent piece whose opening edge is bent toward a side wall of the storage container. The contact device according to 1.   The contact device according to claim 2, wherein an overhang portion is provided from an end portion of the bent piece toward an end portion of the adjacent bent piece.   The metal member is formed in a box shape having an opening on the movable contact side, and the protruding portion is configured by a folded piece whose folded end edge is folded back to the opposite side of the movable contact. The contact device according to 1.   5. The contact device according to claim 1, wherein the metal member is formed in a shape covering an entire surface of the insulating member facing the movable contact.

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