Auxiliary switch and vacuum contactor

Abstract

The utility model belongs to the technical field of low-voltage electric appliances, and discloses an auxiliary switch and a vacuum contactor. The auxiliary switch is used on the vacuum contactor and comprises a shell, a micro switch, a contact support and an elastic piece, a trigger part is arranged on the contact support, and the auxiliary switch has weak current connection capability by utilizing contact matching of the trigger part and a trigger reed of the micro switch when the contact support moves; the reset force of the contact support is provided by arranging the elastic piece, so that the contact support can realize instantaneous reset, the action speed of the contact support is ensured, and the state of the auxiliary switch is switched in time. The shell of the auxiliary switch is arranged in the vacuum contactor, and the microswitch and the trigger part of the contact support are arranged in the shell, so that the vacuum contactor and the shell can provide protection guarantee for the auxiliary switch, and the protection performance of the auxiliary switch is improved; in addition, the microswitch has good protection performance, so that the weak current connection performance and reliability of the auxiliary switch are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an auxiliary switch and a vacuum contactor. Background Technique

[0002] The vacuum contactor mainly consists of an electromagnetic system and a contact system. The contact system includes main contacts and auxiliary contacts. The main contacts are used to connect and disconnect the main circuit, and the auxiliary contacts are used for the control circuit; the electromagnetic system includes an electromagnetic coil and an iron core to drive the contacts to close or open. The vacuum contactor is smaller in volume than the conventional contactor and can be applied to occasions with large current, high voltage, frequent circuit switching and relatively harsh working environments.

[0003] In the prior art, the vacuum contactor is equipped with an auxiliary switch. The contacts of the auxiliary switch play a role of transmission and connection in the circuit; the auxiliary switch does not have the ability to connect weak current, and the protection performance of the auxiliary switch is relatively poor. Although the performance of the vacuum contactor body is excellent and can withstand the test of harsh environments, the contacts of the auxiliary switch often fail to conduct.

[0004] That is, the auxiliary switch equipped with the existing vacuum contactor does not have the ability to connect weak current, has relatively poor protection performance, and is often difficult to conduct in the case of weak current. Summary of the Utility Model

[0005] The purpose of the utility model is to provide an auxiliary switch and a vacuum contactor to solve the problem that the auxiliary switch equipped with the existing vacuum contactor does not have the ability to connect weak current, has relatively poor protection performance, and is often difficult to conduct in the case of weak current.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] The utility model provides an auxiliary switch, which includes:

[0008] A housing;

[0009] A micro switch, arranged in the housing and having a trigger reed;

[0010] A contact support, slidably connected to the housing. One end of the contact support is located outside the housing, and the other end is located inside the housing. A trigger part is provided at the other end of the contact support, and the trigger part is configured to trigger the trigger reed when the contact support slides in the housing;

[0011] An elastic member, located between the other end of the contact support and the housing, and used to provide a restoring force for the contact support.

[0012] As an optional technical solution for an auxiliary switch, the trigger spring has a triggered inclined surface, and the trigger part includes a trigger surface arranged on the contact support, and the trigger surface is an arc surface that abuts against the triggered inclined surface, and the trigger surface is configured to trigger the trigger spring when the contact support slides in the shell.

[0013] As an optional technical solution for an auxiliary switch, the trigger portion further includes a main plane and an avoidance slope, two ends of the trigger surface are respectively connected to the main plane and the avoidance slope, and the avoidance slope extends radially inwardly toward the contact support.

[0014] As an optional technical solution of an auxiliary switch, the contact support extends along a first direction, and an acute angle θ between the avoidance slope and the first direction is greater than an acute angle α between the triggered slope and the first direction.

[0015] As an optional technical solution for an auxiliary switch, two micro switches are provided, and the two micro switches are respectively located on both sides of the contact support. Two trigger surfaces are provided on the trigger part, and the two trigger surfaces can respectively trigger the trigger reeds of the two micro switches at the same time.

[0016] As an optional technical solution for an auxiliary switch, the contact support further includes:

[0017] A first main section is slidably disposed in the housing and partially disposed outside the housing;

[0018] The second main section is located in the shell, the first main section and the second main section are respectively connected to two ends of the trigger part, one end of the trigger part radially protrudes from the first main section, and the other end of the trigger part radially protrudes from the second main section.

[0019] As an optional technical solution for an auxiliary switch, a pressing surface is provided at the end of the trigger portion, the elastic member is sleeved outside a portion of the contact support, and two ends of the elastic member respectively abut against the pressing surface and the shell.

[0020] As an optional technical solution of an auxiliary switch, the auxiliary switch includes at least two wiring terminals, and the wiring terminals are arranged on the housing, and the wiring terminals are both placed on the same side of the housing.

[0021] As an optional technical solution for an auxiliary switch, a positioning portion is provided in the shell, a through hole is provided on the micro switch, and the positioning portion is rod-shaped and penetrates through the through hole.

[0022] The utility model provides a vacuum contactor, which comprises an armature and the auxiliary switch, wherein the armature can press against the contact support.

[0023] Beneficial effects:

[0024] The utility model provides an auxiliary switch, which is used on a vacuum contactor and includes a housing, a microswitch, a contact support, and an elastic member. The microswitch is arranged inside the housing and has a trigger reed; the contact support is slidably connected to the housing, one end of the contact support is placed outside the housing, and the other end is placed inside the housing, and a trigger portion is provided at the other end of the contact support. The trigger portion is configured to trigger the trigger reed when the contact support slides inside the housing; the elastic member is located between the other end of the contact support and the housing and is used to provide a reset force for the contact support. By providing a trigger portion on the contact support and using the contact between the trigger portion and the trigger reed of the microswitch when the contact support moves, the auxiliary switch has the ability to connect weak electricity; by providing an elastic member to provide the reset force of the contact support, the contact support can achieve instantaneous reset, ensuring the action speed of the contact support, so that the auxiliary switch can switch states in time. By arranging the housing of the auxiliary switch inside the vacuum contactor and providing a microswitch and a trigger portion of the contact support inside the housing, the vacuum contactor and the housing can provide protection for the auxiliary switch, improving the protection performance of the auxiliary switch; in addition, the microswitch itself has good protection performance, thus ensuring the weak electricity connection performance and reliability of the auxiliary switch.

[0025] The utility model provides a vacuum contactor, which includes an armature and the above-mentioned auxiliary switch. By equipping with an auxiliary switch with a microswitch, one end of the contact support is placed outside the housing for cooperation with the armature. The armature can press against the contact support and make the trigger portion of the contact support trigger the microswitch, so that the vacuum contactor can transmit signals under the weak electricity conditions of low voltage and small current. Description of the drawings

[0026] Figure 1 is a partial structural schematic diagram of the vacuum contactor provided by the embodiment of the utility model;

[0027] Figure 2 is a partial structural schematic of the auxiliary switch provided by the embodiment of the utility model Figure 1 ;

[0028] Figure 3 is a partial structural schematic of the auxiliary switch provided by the embodiment of the utility model Figure 2 .

[0029] In the figure:

[0030] 1. Auxiliary switch; 2. Outer shell; 3. Connecting piece; 4. Armature;

[0031] 10. Housing; 11. Wiring terminal; 12. Positioning portion;

[0032] 20. Microswitch; 21. Trigger reed;

[0033] 30. Contact support; 31. Trigger part; 311. Main plane; 312. Trigger surface; 313. Sub-plane; 314. Avoidance inclined plane; 32. First main section; 33. Second main section;

[0034] 40. Elastic member. Detailed implementation mode

[0035] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all structures.

[0036] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0037] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is lower than that of the second feature.

[0038] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0039] Such as Figures 1 to 3As shown in the figure, this embodiment provides an auxiliary switch 1 for a vacuum contactor. The auxiliary switch 1 includes a housing 10, a microswitch 20, a contact support 30, and an elastic member 40. The microswitch 20 is disposed inside the housing 10 and has a trigger reed 21. The contact support 30 is slidably connected to the housing 10. One end of the contact support 30 is located outside the housing 10, and the other end of the contact support 30 is located inside the housing 10. A trigger portion 31 is provided at the other end of the contact support 30. The trigger portion 31 is configured to trigger the trigger reed 21 when the contact support 30 slides inside the housing 10. The elastic member 40 is located between the other end of the contact support 30 and the housing 10 and is used to provide a restoring force for the contact support 30.

[0040] By providing the trigger portion 31 on the contact support 30 and using the contact between the trigger portion 31 and the trigger reed 21 of the microswitch 20 when the contact support 30 moves, the auxiliary switch 1 is provided with the ability to connect weak electricity. By providing the elastic member 40 to provide the restoring force of the contact support 30, the contact support 30 can be instantaneously reset, ensuring the action speed of the contact support 30, so that the auxiliary switch 1 can switch states in a timely manner. By disposing the housing 10 of the auxiliary switch 1 inside the vacuum contactor and providing the microswitch 20 and the trigger portion 31 of the contact support 30 inside the housing 10, the vacuum contactor and the housing 10 can provide protection for the auxiliary switch 1, improving the protection performance of the auxiliary switch. In addition, the microswitch 20 itself has good protection performance, thus ensuring the weak electricity connection performance and reliability of the auxiliary switch 1.

[0041] To ensure the installation position of the microswitch 20, a positioning portion 12 is provided inside the housing 10. A through hole is provided on the microswitch 20. The positioning portion 12 is rod-shaped and passes through the through hole. Optionally, one microswitch 20 is sleeved on two positioning portions 12; the two positioning portions 12 are arranged side by side at intervals; the cross section of the positioning portion 12 is circular. By providing the positioning portion 12 on the housing 10, the installation position of the microswitch 20 can be restricted, so as to ensure that the trigger portion 31 can trigger the trigger reed 21 of the microswitch 20 when the contact support 30 slides.

[0042] In this embodiment, two microswitches 20 are provided. The two microswitches 20 are respectively located on both sides of the contact support 30. Two trigger surfaces 312 are provided on the trigger portion 31. The two trigger surfaces 312 can simultaneously trigger the trigger reeds 21 of the two microswitches 20 respectively. Correspondingly, four positioning portions 12 are provided. Every two positioning portions 12 are symmetrically arranged on both sides of the contact support 30. By respectively arranging the two microswitches 20 on both sides of the contact support 30, the structure is simple and the action is accurate, and more contact control combinations can be realized. In other embodiments, one microswitch 20 can also be provided on one side of the contact support 30.

[0043] Specifically, the contact support 30 further includes a first main section 32 and a second main section 33. The first main section 32 and the second main section 33 are respectively connected to both ends of the trigger portion 31. The first main section 32 slidably penetrates through the housing 10 and a part of it is located outside the housing 10. The second main section 33 is located inside the housing 10. One end of the trigger portion 31 protrudes radially from the first main section 32 and the other end protrudes radially from the second main section 33. By arranging the trigger portion 31 between the first main section 32 and the second main section 33, the first main section 32 and the second main section 33 can be slidably engaged with the housing 10 to limit the sliding direction of the contact support 30. By the two ends of the trigger portion 31 respectively protruding radially from the first main section 32 and the second main section 33, the trigger portion 31 is used to limit the extreme positions of the contact support 30 sliding inside the housing 10. The trigger portion 31 is radially protruding. When the contact support 30 moves, the trigger portion 31 presses against the trigger reed 21 on one side, effectively reducing the force on the trigger reed 21 of the microswitch 20 and ensuring the service life of the microswitch 20.

[0044] In this embodiment, a through hole is provided inside the housing 10. The through hole forms a top opening at the top of the housing 10 and a bottom opening at the bottom of the housing 10. The top opening and the bottom opening are oppositely arranged. The first main section 32 penetrates through the top opening and is slidably engaged with the hole wall of the through hole. The second main section 33 movably penetrates through the bottom opening. By providing the through hole on the housing 10, the structure is simple, which can not only meet the movement of the contact support 30 but also effectively limit the movement direction of the contact support 30.

[0045] Wherein, the cross-sectional area of the first main section 32 is larger than that of the second main section 33. The large end of the trigger portion 31 protrudes radially from the first main section 32 and forms a top surface. The small end of the trigger portion 31 protrudes radially from the second main section 33 and forms a pressing surface.

[0046] Optionally, the elastic member 40 is sleeved outside the second main section 33. The two ends of the elastic member 40 respectively abut against the pressing surface and the housing 10. By sleeving the elastic member 40 outside the second main section 33, the elastic force provided by the elastic member 40 acts on the contact support 30 evenly, which helps to improve the stability of the contact support 30 to reset and avoid situations such as jamming due to uneven force. Refer to Figure 2 , in the initial state, the top surface of the contact support 30 abuts against the inner top wall of the housing 10, and the pressing surface of the contact support 30 abuts against the elastic member 40. When the contact support 30 moves downward, the top surface of the contact support 30 gradually moves away from the inner top wall of the housing 10, the pressing surface of the contact support 30 gradually approaches the inner bottom wall of the housing 10, and the elastic member 40 gradually undergoes elastic deformation to accumulate the elastic force that can drive the contact support 30 to reset. The elastic member 40 can be a spring.

[0047] Further, the trigger spring piece 21 has a triggered inclined surface, and the trigger portion 31 includes a trigger surface 312 provided on the contact support 30, the trigger surface 312 is an arc surface that contacts and cooperates with the triggered inclined surface, and the trigger surface 312 is configured to trigger the trigger spring piece 21 when the contact support 30 slides in the housing 10. When the contact support 30 slides up and down, by providing an arc surface on the trigger portion 31, the arc surface contacts and cooperates with the triggered inclined surface of the trigger spring piece 21, so that the triggering can be achieved, and the contact area between the trigger portion 31 and the trigger spring piece 21 can be minimized, which is beneficial to the smoothness of the sliding of the contact support 30.

[0048] In order to achieve trigger buffering and ensure the timeliness of the trigger, the trigger portion 31 also includes a main plane 311 and an avoidance slope 314. The two ends of the trigger surface 312 are respectively connected to the main plane 311 and the avoidance slope 314, and the avoidance slope 314 extends radially inwardly toward the contact support 30. By setting the main plane 311 and the avoidance slope 314, an arc surface is formed between the main plane 311 and the avoidance slope 314 as the trigger surface 312; by setting the inclined avoidance slope 314, when the contact support 30 moves, the avoidance slope 314 can avoid the trigger reed 21.

[0049] In this embodiment, the contact support 30 extends along the first direction, and the acute angle θ between the avoidance slope 314 and the first direction is greater than the acute angle α between the triggered slope and the first direction. By setting the avoidance slope 314 and the triggered slope to different degrees of inclination, the avoidance slope 314 can effectively avoid the contact support 30 during the up and down movement of the contact support 30. In other embodiments, the avoidance slope 314 can also be set parallel to the triggered slope, and the avoidance slope 314 is used to trigger the trigger reed 21 of the micro switch 20; or, the trigger surface 312 is set as an inclined plane. Preferably, the acute angle θ and the acute angle α range from 10 degrees to 30 degrees. In this embodiment, the contact support 30 extends in the vertical direction and can move up and down in the vertical direction; the acute angle θ is 20 degrees; the acute angle α is 15 degrees.

[0050] In this embodiment, the trigger portion 31 further includes a secondary plane 313. The main plane 311 and the secondary plane 313 are parallel and spaced apart. A trigger surface 312 and an avoidance slope 314 are provided between the main plane 311 and the secondary plane 313. The avoidance slope 314 is connected to the secondary plane 313; the main plane 311 protrudes from the secondary plane 313. By providing the main plane 311 and the secondary plane 313, a trigger surface 312 and an avoidance slope 314 are formed between the main plane 311 and the secondary plane 313, the trigger surface 312 can contact the trigger reed 21, and the avoidance slope 314 and the secondary plane 313 can effectively achieve avoidance.

[0051] In order to cooperate with two microswitches 20, the structure of the contact support 30 is symmetrically arranged along the central axis, and both sides of the trigger part 31 are provided with a main plane 311, a secondary plane 313, a trigger surface 312, and an avoidance inclined surface 314.

[0052] Optionally, the auxiliary switch 1 includes at least two terminal blocks 11. The terminal blocks 11 are partially arranged outside the housing 10, and the terminal blocks 11 are all placed on the same side of the housing 10. By centrally arranging the terminal blocks 11 on the same side of the housing 10, it is convenient for the operator to lead wires uniformly, and the wiring is neat and beautiful. In this embodiment, the auxiliary switch 1 is only provided with normally open contacts and normally closed contacts, and no common terminal is provided. When the auxiliary switch 1 is applied to an environment with large impact and vibration, it can avoid misoperation caused by the common terminal, and further ensure the stability and reliability of the auxiliary switch 1 under weak current conditions. In this embodiment, corresponding to the two microswitches 20, four terminal blocks 11 are provided; the contact pins of the microswitches 20 can be led to the terminal blocks 11 of the auxiliary switch 1 by relying on a circuit board or directly leading wires and welded firmly.

[0053] On the other hand, this embodiment provides a vacuum contactor, which includes an armature 4 and an auxiliary switch 1, and the armature 4 can press against the contact support 30 of the auxiliary switch 1.

[0054] By equipping the vacuum contactor with an auxiliary switch 1 with a microswitch 20, one end of the contact support 30 is placed outside the housing 10 for cooperation with the armature 4. The armature 4 can press against the contact support 30 and cause the trigger part 31 of the contact support 30 to trigger the microswitch 20, so that the vacuum contactor can transmit signals under weak current conditions of low voltage and small current.

[0055] Specifically, the vacuum contactor mainly includes a housing 2, a contact system, and an electromagnetic system. The contact system is located at the upper part of the vacuum contactor, and the electromagnetic system is located at the lower part of the vacuum contactor; the armature 4 is a clapper armature. When the control circuit coil of the electromagnetic system is energized, the electromagnetic system generates suction, driving the armature 4 to press against the contact support 30 of the auxiliary switch 1. The contact support 30 moves downward in the housing 10. When the contact support 30 moves to a certain position, it can be connected to the trigger reed 21 of the microswitch 20 to control the microswitch 20 to realize the on-off switching of the contacts; when the control circuit coil of the electromagnetic system is de-energized, the suction of the electromagnetic system disappears, the armature 4 is released, and under the action of the elastic member 40, the contact support 30 moves upward to reset, the contact support 30 is disconnected from the microswitch 20, and the on-off switching of the microswitch 20 returns to the initial state.

[0056] In this embodiment, the vacuum contactor is an AC contactor; the armature 4 can clap the top surface of the first main section 32; the housing 2 includes a bottom plate; the electromagnetic system and the contact system are both arranged inside the housing 2; the vacuum contactor further includes a connecting member 3, the connecting member 3 is erected on the bottom plate of the housing 2, and the auxiliary switch 1 is arranged on the connecting member 3; the auxiliary switch 1 and the electromagnetic system are respectively located on both sides of the connecting member 3; the connecting member 3 is made of a metal material, and the cross section of the connecting member 3 is L-shaped.

[0057] Optionally, the housing 10 of the auxiliary switch 1 is detachably connected to the connecting member 3, and the connecting member 3 is detachably arranged on the bottom plate. The detachable connection can be realized by bolts or screws, etc.

[0058] It can be understood that the specific dimensions of the contact support 30 need to be set according to the actual situation to avoid the working limit position of the trigger reed 21 of the micro switch 20; for example, in the initial state, attention should be paid to designing the positions of the contact support 30 and the micro switch 20, and the trigger surface 312 should be designed according to the position of the trigger reed 21; the reserved length of the first main section 32 placed outside the housing 10 is designed according to the triggering degree of the trigger reed 21 by the trigger surface 312, so as to ensure that when the armature 4 claps the first main section 32 until the top of the first main section 32 is flush with the housing 10, the trigger reed 21 does not reach the working limit position.

[0059] Obviously, the above embodiments of the present invention are only examples for clearly explaining the present invention, and are not limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. Auxiliary switch, used on vacuum contactor, characterized in that: include: Housing (10); A micro switch (20) is disposed in the housing (10) and has a trigger reed (21); A contact support (30) is slidably connected to the housing (10), one end of the contact support (30) is placed outside the housing (10), and the other end is placed inside the housing (10), and a trigger portion (31) is provided at the other end of the contact support (30), and the trigger portion (31) is configured to trigger the trigger reed (21) when the contact support (30) slides inside the housing (10); An elastic member (40) is located between the other end of the contact support (30) and the housing (10) and is used to provide a reset force for the contact support (30).

2. The auxiliary switch according to claim 1, characterized in that: The trigger spring (21) has a triggered inclined surface, and the trigger portion (31) includes a trigger surface (312) arranged on the contact support (30), the trigger surface (312) is an arc surface that contacts and cooperates with the triggered inclined surface, and the trigger surface (312) is configured to trigger the trigger spring (21) when the contact support (30) slides in the housing (10).

3. The auxiliary switch according to claim 2, characterized in that: The trigger portion (31) further comprises a main plane (311) and an avoidance slope (314); two ends of the trigger surface (312) are respectively connected to the main plane (311) and the avoidance slope (314); and the avoidance slope (314) extends radially inwardly toward the contact support (30).

4. The auxiliary switch according to claim 3, characterized in that: The contact support (30) extends along a first direction, and an acute angle θ between the avoidance slope (314) and the first direction is greater than an acute angle α between the triggered slope and the first direction.

5. The auxiliary switch according to claim 2, characterized in that: Two micro switches (20) are provided, and the two micro switches (20) are respectively located on two sides of the contact support (30). The trigger portion (31) is provided with two trigger surfaces (312), and the two trigger surfaces (312) can respectively trigger the trigger reeds (21) of the two micro switches (20) at the same time.

6. The auxiliary switch according to claim 1, characterized in that: The contact support (30) further comprises: A first main section (32) is slidably disposed in the housing (10) and partially disposed outside the housing (10); The second main section (33) is located in the housing (10); the first main section (32) and the second main section (33) are respectively connected to two ends of the trigger portion (31); one end of the trigger portion (31) radially protrudes from the first main section (32); and the other end of the trigger portion (31) radially protrudes from the second main section (33).

7. The auxiliary switch according to any one of claims 1 to 6, characterized in that: The end of the trigger portion (31) is provided with a pressing surface, the elastic member (40) is sleeved on the contact support (30), and the two ends of the elastic member (40) respectively abut against the pressing surface and the housing (10).

8. The auxiliary switch according to any one of claims 1 to 6, characterized in that: The auxiliary switch comprises at least two connection terminals (11), wherein the connection terminals (11) are partially arranged outside the housing (10), and the connection terminals (11) are all placed on the same side of the housing (10).

9. The auxiliary switch according to any one of claims 1 to 6, characterized in that: A positioning portion (12) is provided in the housing (10), a through hole is provided on the micro switch (20), and the positioning portion (12) is rod-shaped and penetrates the through hole.

10. A vacuum contactor, characterized in that: The invention comprises an armature (4) and an auxiliary switch according to any one of claims 1 to 9, wherein the armature (4) is capable of pressing against the contact support (30).

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