Electromagnetic contactor

Abstract

The invention provides an electromagnetic contactor capable of more effectively suppressing separation of a contact part during short circuit. The capsule case (12) is made of resin. The fixed yoke (51) is disposed between the pair of fixed contacts (14), and at least a portion of the fixed yoke (51) is held within a housing (61) constituting the capsule housing (12). The movable yoke (52) is provided to the movable contact (15) and faces the fixed yoke (51). The fixed yoke (51) and the movable yoke (52) attract each other by forming a magnetic path around an axis line in the direction in which a current flows through the movable contact (15) when the contact part (23) is closed.

Description

Technical Field

[0001] The invention relates to an electromagnetic contactor. Background Art

[0002] Patent document 1 discloses that a fixed yoke and a movable yoke are provided to suppress the separation (floating) of the contact portion caused by the electromagnetic repulsion when a short-circuit current flows. The fixed yoke and the movable yoke are configured to form a magnetic circuit around an axis in the direction of the current flowing in the movable contact and attract each other, the fixed yoke is fixed to a bracket linked to the movable iron core, and the movable yoke is fixed to the movable contact.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application No. 2022-506868 Summary of the invention

[0006] Problems to be solved by the invention

[0007] In the structure where the fixed yoke is fixed to the bracket linked to the movable iron core, the fixed yoke moves together with the movable iron core. Therefore, when the fixed yoke and the movable yoke attract each other, the force in the closing direction of the electromagnet may be reduced, and the separation of the contact part caused by the electromagnetic repulsion cannot be effectively suppressed.

[0008] An object of the present invention is to more effectively suppress separation of a contact portion during a short circuit in an electromagnetic contactor.

[0009] Technical solutions to solve problems

[0010] An electromagnetic contactor according to one embodiment of the present invention includes a container, a pair of fixed contacts, a movable contact, a fixed yoke and a movable yoke. The container is made of resin. A pair of fixed contacts are fixed through the container and are formed at a position that becomes one end side in the container. The movable contact is formed with movable contacts opposite to the fixed contacts at both end sides, and when the movable contact is displaced along the depth direction in the container, the contact portion composed of the movable contact and the fixed contact is opened and closed. The fixed yoke is arranged between the pair of fixed contacts, and at least a part of it is retained inside the shell constituting the container. The movable yoke is arranged on the movable contact, opposite to the fixed yoke. The fixed yoke and the movable yoke attract each other by forming a magnetic circuit around the axis of the direction of the current flowing in the movable contact when the contact portion is closed.

[0011] Effects of the Invention

[0012] According to the present invention, since the fixed yoke is held in the housing constituting the resin container, even if the fixed yoke and the movable yoke attract each other, the force in the closing direction of the electromagnet will not be reduced. Therefore, the separation of the contact portion during a short circuit can be more effectively suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a diagram showing an electromagnetic contactor.

[0014] Figure 2 It is a cross-sectional view of a magnetic contactor.

[0015] Figure 3 It is a cross-sectional view of a magnetic contactor.

[0016] Figure 4 It is a diagram showing a fixed yoke and a movable yoke.

[0017] Figure 5 It is a figure which shows a contact support member.

[0018] Figure 6 It is a diagram showing a fixed yoke held by the capsule casing.

[0019] Figure 7 It is a diagram showing a fixed yoke held by the capsule casing. DETAILED DESCRIPTION

[0020] The following is an explanation of the embodiments of the present invention based on the accompanying drawings. The drawings are schematic and may differ from the actual ones. In addition, the following embodiments illustrate the devices and methods for implementing the technical ideas of the present invention, and do not specify the structures as described below. That is, the technical ideas of the present invention can be modified in various ways within the technical scope described in the claimed scope of rights.

[0021] Implementation Method

[0022] "structure"

[0023] In the following description, for the sake of convenience, three directions orthogonal to each other are referred to as a longitudinal direction, a width direction, and a depth direction.

[0024] Figure 1 It is a diagram showing the electromagnetic contactor 11 .

[0025] Here, the state of the electromagnetic contactor 11 observed from one side in the longitudinal direction, one side in the width direction, and the front in the depth direction is shown. The electromagnetic contactor 11 includes a capsule shell 12 (container) and a capsule cap 13. The capsule shell 12 is made of an insulating resin, and is formed into a deep container shape that is closed on both sides in the longitudinal direction, both sides in the width direction, and the front in the depth direction, and is open on the inner side in the depth direction. The capsule cap 13 is made of an insulating resin, and is formed into a shallow container shape that is closed on both sides in the longitudinal direction, both sides in the width direction, and the inner side in the depth direction, and is open on the front side in the depth direction, and is fitted into the inner side of the capsule shell 12 in the depth direction to be sealed.

[0026] A pressurized blocking gas such as hydrogen or nitrogen is enclosed in the capsule shell 12 and the capsule cap 13. Therefore, on the basis of fixing the capsule shell 12 and the capsule cap 13 with an epoxy resin-based adhesive, the outer peripheral surface including the boundary portion is all coated with a laminated film of clay crystals for gas barrier. Specifically, the interlayer ions of the refined montmorillonite are replaced and connected with organic adhesives such as PVA (polyvinyl alcohol) and water-soluble nylon, thereby showing a labyrinth effect to prevent gas molecules such as hydrogen and nitrogen from penetrating. The laminated film is stacked in the thickness direction, and the thickness is, for example, 2μm. The gas barrier coating is, for example, a spray method in which the coating liquid is atomized and applied to the capsule shell 12 and the capsule cap 13, for example, by firing at a temperature above 150°C at which the interlayer ions enter the clay crystals. In this way, in the relationship that the outer peripheral surface is all coated with a gas barrier, the outer peripheral shape of the capsule shell 12 and the capsule cap 13 is preferably a polygon composed of a plane with as few concave and convex straight lines as possible.

[0027] Figure 2 is a cross-sectional view of the electromagnetic contactor 11 .

[0028] Here, in the electromagnetic contactor 11 , a state in which a cross section passing through the center in the width direction and along the longitudinal direction and the depth direction is viewed from one side in the width direction is shown.

[0029] Figure 3 is a cross-sectional view of the electromagnetic contactor 11 .

[0030] Here, in the electromagnetic contactor 11 , a state of a cross section passing through the center in the longitudinal direction and along the width direction and the depth direction is shown as viewed from one side in the longitudinal direction.

[0031] First, a basic structure of the electromagnetic contactor 11 will be described. The electromagnetic contactor 11 includes a pair of fixed contacts 14 , a movable contact 15 , a contact support 16 , and an electromagnet portion 17 .

[0032] The pair of fixed contacts 14 is a conductive metal and is formed into a substantially cylindrical shape extending in the depth direction. The pair of fixed contacts 14 are arranged at intervals in the longitudinal direction, penetrate from the inside to the outside of the capsule case 12, and are integrated with the capsule case 12 by insert molding. The longitudinal inner end of the end surface of the fixed contact 14 facing the inner side in the depth direction becomes a fixed contact point 21.

[0033] The movable contact 15 is a conductive metal, extends in the longitudinal direction, is formed in the shape of a flat plate in the longitudinal and width directions, and is arranged on the inner side in the depth direction of the pair of fixed contacts 14. The longitudinal outer ends of the end surface of the movable contact 15 facing the depth direction serve as movable contacts 22 facing the fixed contacts 21. The fixed contacts 21 and the movable contacts 22 constitute a contact portion 23, and the contact portion 23 is opened and closed by the displacement of the movable contact 15 in the depth direction.

[0034] The contact support 16 is formed into a frame shape that closes both sides in the width direction and both sides in the depth direction, and the movable contact 15 and the contact spring 26 are held inside the frame. The contact spring 26 is a compression coil spring that expands and contracts in the depth direction, and applies force to the movable contact 15 toward the front in the depth direction. A permanent magnet 27 and a yoke 28 that sense the arc of the contact portion 23 are held inside the capsule shell 12. The permanent magnet 27 is in the shape of a flat plate and is arranged on both sides in the longitudinal direction across the movable contact 15. The yoke 28 is a U-shaped yoke that closes the outer side in the longitudinal direction and both sides in the width direction and is open to the inner side in the longitudinal direction, and is arranged on the outer side in the longitudinal direction of the permanent magnet 27.

[0035] The electromagnet portion 17 is disposed on the inner side in the depth direction, and includes a bobbin 31 , a plunger 32 , an outer yoke 33 , a bottom yoke 34 , a permanent magnet 35 , an auxiliary yoke 36 , and a return spring 37 .

[0036] The winding frame 31 is made of insulating resin, and a coil 42 is wound around a cylindrical winding shaft 41 extending in the depth direction. A cylindrical plunger ring 43 is fitted inside the winding shaft 41 at the front in the depth direction, and a cylindrical sliding sleeve 44 is fitted at the inner side in the depth direction. Ribs 45 are formed on the inner side in the depth direction of the winding frame 31 so as to surround four directions orthogonal to the depth direction, that is, both sides in the longitudinal direction and both sides in the width direction.

[0037] The plunger 32 is a cylindrical movable iron core extending in the depth direction, and the plunger ring 43 and the sliding sleeve 44 are inserted in a state that they can move forward and backward in the axial direction. The plunger 32 is longer than the winding shaft 41, and the contact support 16 is connected to the front end in the depth direction, and the armature 46 is connected to the rear end in the depth direction. The armature 46 is a disc-shaped yoke along the longitudinal and width directions.

[0038] The outer yoke 33 is a substantially U-shaped yoke that is open toward the back in the depth direction when viewed from the width direction, and is provided to cover both longitudinal sides and the front in the depth direction of the winding frame 31. The front end of the plunger ring 43 of the outer yoke 33 is fitted into a circular hole that penetrates in the depth direction.

[0039] The bottom yoke 34 is a plate-shaped yoke extending in the longitudinal and width directions and is arranged inwardly of the winding axis 41 of the bobbin 31 in the depth direction and fixed to the inner ends of both sides of the outer yoke 33. The plunger 32 passes through a circular hole of the bottom yoke 34 extending in the depth direction.

[0040] The permanent magnet 35 is in the shape of a flat plate extending in the longitudinal and width directions, has a circular hole penetrating in the depth direction, is fitted inside the rib 45 , and is attracted to the back surface of the bottom yoke 34 .

[0041] The auxiliary yoke 36 is a flat plate in the longitudinal and width directions, has a circular hole penetrating in the depth direction, is fitted inside the rib 45, and is attracted to the inner surface of the permanent magnet 35. The armature 46 of the plunger 32 is arranged between the bottom yoke 34 and the auxiliary yoke 36.

[0042] The return spring 37 is a compression coil spring that expands and contracts in the depth direction, is provided between the sliding sleeve 44 and the armature 46 , and urges the plunger 32 to the depth in the depth direction via the armature 46 .

[0043] According to the above structure, in the non-excitation state where the coil 42 is not energized, the plunger 32 is displaced to the inner side in the depth direction by the magnetic force of the permanent magnet 35 and the repulsive force of the return spring 37. The magnetic flux of the permanent magnet 35 passes through the bottom yoke 34, the outer yoke 33, the plunger ring 43, the plunger 32, the armature 46 and the auxiliary yoke 36 from the front of the permanent magnet 35 in sequence and reaches the inner side surface of the permanent magnet 35. Through this closed magnetic circuit, the armature 46 is attracted to the front of the auxiliary yoke 36. In this way, when the plunger 32 is displaced to the inner side in the depth direction, the contact is disconnected through the contact support 16 and becomes a released state. At this time, the armature 46 is separated from the inner side surface of the bottom yoke 34.

[0044] If the coil 42 is energized and excited from this state, the armature 46 is attracted to the inner surface of the bottom yoke 34 by the magnetic force of the coil 42. As a result, the plunger 32 is configured to be displaced toward the front in the depth direction by overcoming the magnetic force of the permanent magnet 35 and the repulsive force of the return spring 37. The magnetic flux of the coil 42 passes through the plunger 32, the armature 46, the bottom yoke 34, and the outer yoke 33 from the inner circumference of the plunger ring 43 to the outer circumference of the plunger ring 43. Through this closed magnetic circuit, the armature 46 is attracted to the inner surface of the bottom yoke 34. In this way, when the plunger 32 is displaced toward the front in the depth direction, the contacts are closed via the contact support 16 and become closed. At this time, the armature 46 is separated from the front of the auxiliary yoke 36.

[0045] Next, a structure for suppressing separation (lifting) of the contact portion 23 due to the electromagnetic repulsive force when a short-circuit current flows will be described.

[0046] The electromagnetic contactor 11 includes a fixed yoke 51 and a movable yoke 52. The fixed yoke 51 is disposed between a pair of fixed contacts 14, and at least a portion thereof is held in a housing constituting the capsule housing 12. The movable yoke 52 is provided on the movable contact 15, and is opposed to the fixed yoke 51 when the contact portion 23 is closed. The fixed yoke 51 and the movable yoke 52 attract each other by forming a magnetic circuit around an axis in a direction in which current flows in the movable contact 15 when the contact portion 23 is closed.

[0047] Figure 4It is a diagram showing the fixed yoke 51 and the movable yoke 52 .

[0048] (a) in the figure shows the state of the fixed yoke 51 observed from one side in the longitudinal direction, one side in the width direction, and the front side in the depth direction. The fixed yoke 51 is a flat yoke extending in the width direction and along the width direction and the longitudinal direction, including a large-size portion 53 and a small-size portion 54, and is formed into a roughly cross shape when viewed from the depth direction. The longitudinal dimension of the large-size portion 53 is relatively large, and the longitudinal dimension of the small-size portion 54 is relatively small. The area shown in the shaded area is the embedded portion 55 embedded in the shell of the capsule shell 12, and the area other than this becomes the exposed portion 56. The large-size portion 53 is the embedded portion 55 as a whole. The inner side of the small-size portion 54 in the width direction and the front side in the depth direction are the embedded portion 55, and the outer side in the width direction and the inner side in the depth direction are the exposed portion 56. As the exposed portion 56, the end faces on both sides in the longitudinal direction, the outer end face in the width direction, and the inner end face in the depth direction are ensured.

[0049] (b) in the figure shows the state of the movable yoke 52 observed from one side in the longitudinal direction, one side in the width direction, and the front in the depth direction. The movable yoke 52 is a yoke formed in a substantially U-shaped shape and opened to the front in the depth direction when viewed from the longitudinal direction, and covers both sides in the width direction and the inner side in the depth direction of the movable contact 15. The inner dimension in the width direction of the movable yoke 52 corresponds to the dimension in the width direction of the movable contact 15, and the outer dimension in the width direction corresponds to the dimension in the width direction of the movable yoke 52. The front end surfaces of the walls extending toward the depth direction on both sides of the width direction of the movable yoke 52 are opposite to the pair of exposed portions 56 of the fixed yoke 51.

[0050] Figure 5 It is a figure which shows the contact support member 16.

[0051] (a) in the figure shows the state of the contact support 16 when viewed from one side in the longitudinal direction, one side in the width direction, and the front in the depth direction. (b) in the figure shows the state of the cross section of the contact support 16 when viewed from one side in the longitudinal direction passing through the center of the longitudinal direction and along the width direction and the depth direction. The contact support 16 is formed into a roughly U-shaped shape that opens toward the front in the depth direction when viewed from the longitudinal direction, and a cover 57 is integrated by insert molding at both end sides in the width direction. The cover 57 is formed into a roughly U-shaped shape that opens toward the inner side in the depth direction when viewed from the longitudinal direction, and closes the front of the contact support 16 in the depth direction. Therefore, the contact support 16 and the cover 57 are formed into a roughly U-shaped shape when viewed from the longitudinal direction. Openings 58 are formed in the curved portions on both end sides of the cover 57 in the width direction. Inside the contact support 16 and the cover 57 , the movable contact 15 , the movable yoke 52 , and the contact spring 26 are embedded in order from the front in the depth direction. Both ends of the movable yoke 52 protrude from the opening 58 of the cover 57 to the front in the depth direction.

[0052] Figure 6 It is a diagram showing the fixed yoke 51 held by the capsule casing 12 .

[0053] Here, the state of the cross section along the longitudinal and width directions, viewed from the inner side in the depth direction through the inner side of the fixed contact 14 in the depth direction in the capsule shell 12, is shown. The fixed yoke 51 is buried in the shell 61 constituting the ceiling of the capsule shell 12, and the exposed portions 56 located at the two end sides of the fixed yoke 51 in the width direction are exposed. A pair of exposed portions 56 are opposite to the two ends of the movable yoke 52 in the width direction in the depth direction. In order to ensure the contact friction amount, it is set so that the fixed yoke 51 and the movable yoke 52 do not contact each other when the contact portion 23 is closed.

[0054] Figure 7 It is a diagram showing the fixed yoke 51 held by the capsule casing 12 .

[0055] (a) in the figure shows a state of a cross section along the longitudinal and width directions, observed from one side in the longitudinal direction, the other side in the width direction, and the inner side in the depth direction, through the inner side of the shell 61 closer to the depth direction and in the capsule shell 12. (b) in the figure shows a state of a cross section along the longitudinal and width directions, observed from one side in the longitudinal direction, the other side in the width direction, and the inner side in the depth direction, through the fixed yoke 51 in the capsule shell 12. Openings 62 are formed at both end surfaces in the width direction of the shell 61, and the small-sized portion 54 of the fixed yoke 51 protrudes from the opening 62, and the exposed portion 56 is exposed. That is, the shell 61 has a cavity that passes through in the width direction, and the fixed yoke 51 is held therein. The fixed yoke 51 is integrated with the shell 61 of the capsule shell 12 by insert molding, so that the embedded portion 55 is in close contact with the opening 62.

[0056] 《Effects》

[0057] Next, main effects of the embodiment will be described.

[0058] The electromagnetic contactor 11 includes a capsule case 12, a pair of fixed contacts 14, a movable contact 15, a fixed yoke 51, and a movable yoke 52. The capsule case 12 is made of resin. The pair of fixed contacts 14 penetrate the capsule case 12 and are fixed, and a fixed contact 21 is formed at a position that becomes one end side in the capsule case 12. The movable contact 15 is formed with movable contacts 22 opposite to the fixed contacts 21 at both ends, and when the movable contact 15 is displaced in the depth direction in the capsule case 12, the contact portion 23 composed of the movable contact 22 and the fixed contact 21 is opened and closed. The fixed yoke 51 is arranged between the pair of fixed contacts 14, and at least a part of it is retained in the case 61 constituting the capsule case 12. The movable yoke 52 is provided on the movable contact 15, and is opposite to the fixed yoke 51. The fixed yoke 51 and the movable yoke 52 attract each other by forming a magnetic circuit around the axis of the direction of the current flowing in the movable contact 15 when the contact portion 23 is closed. Thus, since the fixed yoke 51 is held in the housing 61 constituting the resin capsule housing 12, even if the fixed yoke 51 and the movable yoke 52 attract each other, the force in the closing direction of the electromagnet portion 17 will not be reduced. Therefore, the separation of the contact portion 23 during a short circuit can be more effectively suppressed. By making the capsule housing 12 made of resin, the degree of freedom of design is improved in the structure for holding the fixed yoke 51 in the housing 61.

[0059] The housing 61 is provided with an opening 62 that exposes a portion of the fixed yoke 51. Thus, during insert molding, the fixed yoke 51 can be attached to a mold through the portion exposed after molding.

[0060] The fixed yoke 51 is formed into a flat plate shape extending in a direction perpendicular to the movable contact 15 when viewed from the depth direction, and includes an embedded portion 55 and an exposed portion 56. The embedded portion 55 is embedded in the housing 61. The exposed portion 56 protrudes from the opening 62. Thus, during insert molding, the fixed yoke 51 can be mounted on the mold through the portion protruding from the opening 62 after molding. In particular, as the exposed portion 56, by ensuring the end faces on both sides in the longitudinal direction, the outer end face in the width direction, and the inner end face in the depth direction, the fixed yoke 51 can be positioned relative to the mold.

[0061] The embedded portion 55 is larger than the opening 62 when viewed from the protruding direction of the exposed portion 56. Thus, the fixed yoke 51 can be prevented from being displaced relative to the housing 61 or coming off.

[0062] The embedded portion 55 of the fixed yoke 51 is in close contact with the inside of the housing 61. Thus, the looseness of the fixed yoke 51 can be suppressed.

[0063] The movable yoke 52 is formed into a U-shape that is open to the fixed yoke 51 when the movable contact 15 is viewed from the direction of the flowing current. As a result, a magnetic circuit can be formed around the axis of the direction of the flowing current in the movable contact 15 when the contact portion 23 is closed. In addition, in a structure in which one side of the fixed yoke 51 is formed into a U-shape, the movable contact 15 is made to enter the inner side of the fixed yoke when the contact portion 23 is closed, and high-precision movement is required, thereby increasing the design cost. In contrast, in a structure in which one side of the movable yoke 52 is formed into a U-shape, since the movable contact 15 and the movable yoke 52 are interlocked and integrated, high-precision movement is not required when the contact portion 23 is closed, and the design cost can be suppressed.

[0064] The capsule casing 12 is gas-barrier coated with a laminated film of clay crystals, thereby suppressing the permeation of gas molecules such as hydrogen and nitrogen, and preventing leakage of pressurized barrier gas.

[0065] The fixed yoke 51 is integrated into the housing 61 by insert molding. This allows the embedded portion 55 of the fixed yoke 51 to be in close contact with the housing 61, thereby suppressing the looseness of the fixed yoke 51. In addition, the fixed yoke 51 does not need to be assembled into the housing 61, and the joint strength is improved.

[0066] Next, comparative examples will be described.

[0067] Here, a structure in which a fixed yoke is fixed to a bracket that is linked to a movable iron core, and a movable yoke is fixed to a movable contact is described as a comparative example. Thus, in a structure in which a fixed yoke is fixed to a bracket that is linked to a movable iron core, the fixed yoke is displaced together with the movable iron core. Therefore, when the fixed yoke and the movable yoke attract each other, the force in the closing direction of the electromagnet part may be reduced, and the separation of the contact part caused by the electromagnetic repulsion force cannot be effectively suppressed.

[0068] 《Variation Example》

[0069] In the embodiment, the fixed contact 14 is described as being formed in a cylindrical shape, but the present invention is not limited thereto. That is, the fixed contact 14 may have any shape, and may be formed in a flat plate shape extending in the longitudinal direction and along the longitudinal and width directions, for example.

[0070] In the embodiment, a partition wall is provided inside the capsule case 12 to separate the contact portion 23 from the permanent magnet 27, but the present invention is not limited thereto. That is, an insulating holder serving as an arc barrier may be added inside the capsule case 12 to separate the contact portion 23 from the permanent magnet 27.

[0071] Although the above description has been made with reference to a limited number of embodiments, the scope of rights is not limited thereto, and modifications based on the above disclosed embodiments will be obvious to those skilled in the art.

[0072] Description of Reference Numerals

[0073] 11…electromagnetic contactor, 12…capsule housing, 13…capsule cap, 14…fixed contact, 15…movable contact, 17…electromagnet portion, 21…fixed contact, 22…movable contact, 23…contact portion, 26…contact spring, 27…permanent magnet, 28…yoke, 31…winding frame, 32…plunger, 33…outer yoke, 34…bottom yoke, 35…permanent magnet, 36…auxiliary yoke, 37…reset spring, 41…winding shaft, 42…coil, 43…plunger ring, 44…sliding sleeve, 45…rib, 46…armature, 51…fixed yoke, 52…movable yoke, 53…large size portion, 54…small size portion, 55…buried portion, 56…exposed portion, 57…cover, 58…opening portion, 61…housing, 62…opening portion.

Claims

1. An electromagnetic contactor, characterized in that: include: Resin containers; a pair of fixed contacts penetrating the container and fixedly provided with fixed contacts at a position on one end side in the container; A movable contact having movable contacts opposite to the fixed contacts formed at both ends thereof, and opening and closing a contact portion formed by the movable contacts and the fixed contacts when the movable contacts are displaced in the depth direction within the container; a fixed yoke disposed between the pair of fixed contacts, at least a portion of which is held within a housing constituting the container; and a movable magnetic yoke, which is arranged on the movable contact and is opposite to the fixed magnetic yoke, The fixed yoke and the movable yoke attract each other by forming a magnetic circuit formed around an axis in a direction in which a current flows through the movable contact when the contact portion is closed.

2. The electromagnetic contactor according to claim 1, characterized in that: The housing has an opening formed therein so as to expose a portion of the fixed yoke.

3. The electromagnetic contactor according to claim 2, characterized in that: The fixed yoke is formed in a flat plate shape extending in a direction perpendicular to the movable contactor when viewed from the depth direction, and includes an embedded portion embedded in the housing and an exposed portion protruding from the opening.

4. The electromagnetic contactor according to claim 3, characterized in that: The embedded portion is larger than the opening portion when viewed from the protruding direction of the exposed portion.

5. The electromagnetic contactor according to claim 3, characterized in that: The embedded portion of the fixed yoke is tightly attached to the inside of the housing.

6. The electromagnetic contactor according to claim 3, characterized in that: The movable yoke is formed in a U-shape that is open toward the fixed yoke when the movable contact is viewed from a direction in which current flows.

7. The electromagnetic contactor according to claim 1, characterized in that: The container has a gas barrier coating formed with a laminated film of clay crystals.

8. The electromagnetic contactor according to claim 1, characterized in that: The fixed yoke is integrated into the housing by insert molding.

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