An operating mechanism and a circuit breaker

Abstract

This application provides an operating mechanism and a circuit breaker, relating to the field of low-voltage electrical equipment technology. The operating mechanism includes an operating element, a connecting rod, a locking element, and a moving contact mechanism. The first end of the connecting rod is driven to the operating element, and the second end is driven to the moving contact mechanism. The first end of the locking element is driven to the operating element, and the second end, in the closed state, abuts against the second end of the connecting rod to keep the moving contact mechanism in the closed position. In this operating mechanism, the operating element is directly connected to the moving contact mechanism via the connecting rod, and the movement of the moving contact mechanism is restricted by the locking element. The operating element has no idle stroke, a large stroke, and a large contact opening distance, which improves dielectric, electrical life, and short-circuit breaking performance. It has a simple structure and occupies little space.

Description

Technical Field

[0001] This application relates to the field of low-voltage electrical technology, and more specifically, to an operating mechanism and a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. It has short-circuit, overload, or leakage protection functions.

[0003] Chinese patent CN116246914A discloses an operating mechanism and a circuit breaker. The operating mechanism includes a button, a linkage, and a mechanism base. One end of the linkage is rotatably connected to the button, and the other end is rotatably connected to the mechanism base. A moving contact is fixed on the mechanism base. The button drives the mechanism base to rotate via the linkage, causing the moving contact to move and contact or separate from the stationary contact. However, this operating mechanism requires the linkage to pass through a dead point to keep the moving contact in the closed position. The button requires a large free stroke to lock the moving contact, occupies a large space, has a complex structure, and a small contact opening distance, which is not conducive to improving the performance parameters of the circuit breaker. Summary of the Invention

[0004] The purpose of this application is to address the shortcomings of the prior art by providing an operating mechanism and circuit breaker with a large contact opening distance and a small footprint.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In one aspect of this application, an operating mechanism is provided, which is disposed within a housing and includes: an operating member, a connecting rod, a locking member, and a moving contact mechanism. The first end of the connecting rod is driven to be connected to the operating member, and the second end is driven to be connected to the moving contact mechanism. The first end of the locking member is driven to be connected to the operating member, and the second end abuts against the second end of the connecting rod in the closed state, so that the moving contact mechanism is kept in the closed position.

[0007] Optionally, the locking element is rotatably disposed within the housing, and a locking spring is provided on the locking element. The locking spring causes the locking element to maintain a tendency to rotate in the first direction, so that the locking element presses the connecting rod in the closed state, thereby causing the connecting rod to press the moving contact mechanism.

[0008] Optionally, the first end of the locking member is provided with a release surface, and the operating member is provided with a first release boss. The first release boss is used to drive the release surface to rotate in a second direction opposite to the first direction, so as to separate the locking member from the connecting rod.

[0009] Optionally, the second end of the locking member is provided with a bearing surface, and the second end of the connecting rod is provided with a bearing boss, the bearing surface being used to abut against the bearing boss.

[0010] Optionally, the moving contact mechanism is rotatably mounted inside the housing, and a contact spring is provided on the moving contact mechanism. When the moving contact mechanism is in the closed position, the contact spring is in a deformed and energy-storing state.

[0011] Optionally, the moving contact mechanism includes a free-tripping assembly and a moving contact, the moving contact being drivenly connected to the free-tripping assembly, and the free-tripping assembly being drivenly connected to the second end of the connecting rod.

[0012] Optionally, it may also include a first trip unit and / or a second trip unit, wherein the first trip unit is used to drive the free trip assembly to trip in the event of a short-circuit fault, and the second trip unit is used to drive the free trip assembly to trip in the event of an overcurrent fault.

[0013] Optionally, the free trip assembly includes a mechanism seat and a locking element, with the moving contact elastically connected to the mechanism seat. The mechanism seat and the locking element together define the range of motion of the second end of the linkage. The first trip unit and / or the second trip unit drive the locking element to trip with the mechanism seat in the event of a current fault.

[0014] Optionally, the operating element and / or connecting rod are provided with a return spring, which is used to drive the operating element and / or connecting rod to the open position.

[0015] In another aspect of the embodiments of this application, a circuit breaker is provided, including a housing, a stationary contact disposed within the housing, and an operating mechanism as described above, wherein the moving contact mechanism of the operating mechanism cooperates with the stationary contact.

[0016] The beneficial effects of this application include:

[0017] This application provides an operating mechanism disposed within a housing, comprising: an operating element, a connecting rod, a locking element, and a moving contact mechanism. The first end of the connecting rod is driven to the operating element, and the second end is driven to the moving contact mechanism. The first end of the locking element is driven to the operating element, and the second end, in the closed state, abuts against the second end of the connecting rod to keep the moving contact mechanism in the closed position. In this operating mechanism, the operating element is directly connected to the moving contact mechanism via the connecting rod, and the movement of the moving contact mechanism is restricted by the locking element. The operating element has no idle stroke, a large stroke, and a large contact opening distance, which can improve dielectric, electrical life, and short-circuit breaking performance. The structure is simple and occupies little space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1This is a schematic diagram of the circuit breaker in the open state provided in an embodiment of this application;

[0020] Figure 2 This is one of the structural schematic diagrams of a circuit breaker in the closed state provided in the embodiments of this application;

[0021] Figure 3 This is a second schematic diagram of the circuit breaker in the closed state provided in an embodiment of this application.

[0022] Figure 4 This is a schematic diagram of the locking element in the operating mechanism provided in the embodiments of this application;

[0023] Figure 5 This is a schematic diagram of the structure of the operating component in the operating mechanism provided in the embodiments of this application;

[0024] Figure 6 This is a schematic diagram of the structure of the mechanism seat in the operating mechanism provided in the embodiments of this application;

[0025] Figure 7 This is a schematic diagram of the locking element in the operating mechanism provided in the embodiments of this application.

[0026] Icons: 110 - Operating component; 111 - First tripping boss; 112 - Clearance groove; 113 - Second slide groove; 120 - Connecting rod; 121 - Supporting boss; 130 - Moving contact mechanism; 131 - Free tripping assembly; 1311 - First slide groove; 1311a - Connecting rod supporting surface; 1312 - Mechanism seat; 1312a - First mounting platform; 1313 - Locking component; 1313a - Short circuit protection Tripping end; 1313b - Overload protection tripping end; 1313c - Mechanism seat limiting surface; 1313d - Second mounting platform; 1314 - Locking spring; 132 - Moving contact; 140 - Locking element; 141 - Tripping surface; 142 - Second tripping boss; 143 - Supporting surface; 151 - First trip unit; 152 - Second trip unit; 200 - Circuit breaker; 210 - Housing; 220 - Stationary contact. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. It should be noted that, unless otherwise specified, the various features in the embodiments of this application can be combined with each other, and the combined embodiments are still within the protection scope of this application.

[0029] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0030] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0031] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0032] Existing operating mechanisms include a button, a linkage, and a mechanism base. One end of the linkage is rotatably connected to the button, and the other end is rotatably connected to the mechanism base. A moving contact is fixed on the mechanism base. The button drives the mechanism base to rotate via the linkage, causing the moving contact to move and contact or separate from the stationary contact. However, the above operating mechanism requires the linkage to pass through a dead point to keep the moving contact in the closed position. The operating mechanism requires a large free stroke to lock the moving contact, occupying a large space, which is not conducive to the miniaturization design of circuit breakers.

[0033] To address the aforementioned technical problems, one aspect of the embodiments of this application is described below. Figure 1 and Figure 2An operating mechanism is provided, configured within a housing 210 (such as the housing 210 of a circuit breaker 200). Specifically, the operating mechanism includes an operating element 110, a connecting rod 120, and a moving contact mechanism 130. The operating element 110 is mounted on the housing 210 and can reciprocate to or reciprocate to slide relative to the housing 210, allowing the user to manually perform opening and closing operations. The connecting rod 120 has a first end and a second end, the first end of which is driven to the operating element 110, and the second end of which is driven to the moving contact mechanism 130. It is understood that the two parts being driven together means that the movement of one part can drive the movement of the other part; the movements of the two parts can be asynchronous or in different forms. For example, if the user manually drives the operating element 110 to slide, the operating element 110 can rotate the connecting rod 120; conversely, the rotation of the connecting rod 120 can also drive the operating element 110 to slide. Driven by the connecting rod 120, the moving contact mechanism 130 can move within the housing 210 to contact the stationary contact 220 disposed in the housing 210 for closing or opening the circuit. In other words, the operating member 110 directly controls the action of the moving contact mechanism 130 through the connecting rod 120.

[0034] Please refer to the reference. Figure 3 The operating mechanism also includes a locking member 140, which also has a first end and a second end. The first end of the locking member 140 is driven to connect with the operating member 110, and the second end abuts against the second end of the connecting rod 120 in the closed state, so as to keep the moving contact mechanism 130 in the closed position.

[0035] like Figure 1 As shown, the operating mechanism is in the open state at this time, and the moving contact mechanism 130 is separated from the stationary contact 220. Figure 2 and Figure 3 As shown, the driving operation member 110 (such as pushing the operation member 110 into the housing 210) drives the connecting rod 120 to move. The movement of the connecting rod 120 drives the moving contact mechanism 130 to move towards the stationary contact 220, thereby realizing the closing. In the closed state, the second end of the locking member 140 abuts against the second end of the connecting rod 120 to apply a continuous clamping force to the connecting rod 120, so that the connecting rod 120 is held in the current position, thereby keeping the moving contact mechanism 130 in the closed position.

[0036] In the above-mentioned operating mechanism, the operating member 110 is directly connected to the moving contact mechanism 130 through the connecting rod 120, and the movement of the moving contact mechanism 130 is restricted by the locking member 140. The operating member 110 has no idle stroke, a large stroke, and a large contact opening distance, which can improve dielectric, electrical life, short circuit breaking and other performance. The structure is simple and occupies little space.

[0037] Optionally, the locking member 140 is rotatably disposed within the housing 210. The locking member 140 is provided with a locking spring, which causes the locking member 140 to maintain a tendency to rotate in the first direction (the direction in which the connecting rod 120 is located). When the circuit is closed, the locking spring drives the locking member 140 to rotate in the direction in which the connecting rod 120 is located, so as to press the connecting rod 120, thereby causing the connecting rod 120 to press the moving contact mechanism 130.

[0038] For example, the locking spring is a torsion spring, with one torsion arm abutting against the housing 210 and the other torsion arm abutting against the locking member 140. The torsion arm abutting against the locking member 140 presses the locking member 140 in the direction of the connecting rod 120, thereby pressing the connecting rod 120 against the moving contact mechanism 130.

[0039] Alternatively, please refer to Figure 4 and Figure 5 The first end of the locking member 140 is provided with a release surface 141, and the operating member 110 is provided with a first release boss 111. The first release boss 111 is used to drive the release surface 141 to rotate in a second direction opposite to the first direction, so as to separate the locking member 140 from the connecting rod 120.

[0040] Please refer to the reference. Figure 1 and Figure 2 When the circuit is closed, the tripping surface 141 of the locking member 140 abuts against the side of the first tripping boss 111. When the circuit is open, the operating member 110 moves in the opposite direction to the closing position, and the side of the first tripping boss 111 pushes the tripping surface 141 of the locking member 140, thereby causing the locking member 140 to rotate in the second direction. The locking member 140 separates from the connecting rod 120 to release the restriction on the connecting rod 120, thereby allowing the moving contact mechanism 130 to separate from the stationary contact 220.

[0041] For example, the first end of the locking member 140 is provided with a second release boss 142, and the release surface 141 is the side of the second release boss 142 facing the first release boss 111. The operating member 110 is also provided with a relief groove 112, which is located on the side of the first release boss 111 and is used to avoid the second release boss 142, so that the release surface 141 can abut against the first release boss 111.

[0042] Alternatively, please refer to Figure 3 and Figure 4 The second end of the locking member 140 is provided with a bearing surface 143, and the second end of the connecting rod 120 is provided with a bearing boss 121. The bearing surface 143 is used to abut against the bearing boss 121. The locking member 140 acts on the bearing boss 121 of the connecting rod 120 through the bearing surface 143, which can make the force on the connecting rod 120 more stable, so as to ensure that the moving contact mechanism 130 can be kept in the closed position.

[0043] Alternatively, please refer to Figure 1 and Figure 2 The moving contact mechanism 130 is rotatably mounted inside the housing 210. The moving contact mechanism 130 is provided with a contact spring. When the moving contact mechanism 130 is in the closed position, the contact spring is in a deformed energy storage state.

[0044] When the locking element 140 releases its restriction on the connecting rod 120, the moving contact mechanism 130 can be reset under the action of the contact spring and separate from the stationary contact 220, thereby realizing the opening of the circuit breaker.

[0045] Optionally, the moving contact mechanism 130 includes a free trip assembly 131 and a moving contact 132, the moving contact 132 being drivenly connected to the free trip assembly 131, and the free trip assembly 131 being drivenly connected to the second end of the connecting rod 120.

[0046] When the free trip assembly 131 is not tripped, the operating member 110 drives the free trip assembly 131 to move through the connecting rod 120, thereby driving the moving contact 132 to move towards the stationary contact to achieve closing; after tripping, the free trip assembly 131 can drive the moving contact 132 to separate from the stationary contact to achieve opening.

[0047] For example, the free release assembly 131 is provided with a first slide groove 1311, and the second end of the connecting rod 120 is located in the first slide groove 1311.

[0048] The second end of the connecting rod 120 slides in the first slide groove 1311. When the second end of the connecting rod 120 abuts against the side wall of the first slide groove 1311, the connecting rod 120 and the free release assembly 131 can be relatively fixed. The connecting rod 120 can apply force to the free release assembly 131 by abutting, thereby restricting the moving contact 132 to the closed position.

[0049] For example, please refer to the reference. Figure 6 The first slide groove 1311 is provided with a connecting rod abutment surface 1311a, which is recessed inward relative to the inner wall of the first slide groove 1311. In the closed state, the second end of the connecting rod 120 abuts against the connecting rod abutment surface 1311a of the first slide groove 1311, so that the force of the connecting rod 120 acting on the moving contact mechanism 130 is more stable.

[0050] In other embodiments, the free release assembly 131 may also be a linkage structure. The linkage structure free release assembly 131 is prior art and is not limited here.

[0051] Alternatively, please refer to Figure 1 , Figure 2 and Figure 5The operating member 110 is provided with a second slide groove 113, and the first end of the connecting rod 120 is located in the second slide groove 113. The second slide groove 113 provides movable space for the first end of the connecting rod 120, thereby providing movable space for the operating member 110 while keeping the moving contact 132 stationary when the operating member 110 is tripped. This movable space allows the operating member 110 to reliably drive the locking member 140 to rotate, thereby releasing the locking member 140 from the abutting state with the connecting rod 120.

[0052] Optionally, the operating mechanism further includes a first trip unit 151 and / or a second trip unit 152, wherein the first trip unit 151 is used to drive the free trip assembly 131 to trip in the event of a short-circuit fault, and the second trip unit 152 is used to drive the free trip assembly 131 to trip in the event of an overcurrent fault.

[0053] For example, the first trip unit 151 is an electromagnetic trip unit, and the second trip unit 152 is a thermal trip unit (i.e., a thermal bimetallic strip). The structures of the electromagnetic trip unit and the thermal trip unit are existing technologies, and will not be described in detail here.

[0054] Alternatively, please refer to Figure 1 , Figure 2 , Figure 6 and Figure 7 The free trip assembly 131 includes a mechanism base 1312 and a locking member 1313. The moving contact 132 is elastically connected to the mechanism base 1312. The mechanism base 1312 and the locking member 1313 together define the range of motion of the second end of the connecting rod 120. The first trip unit 151 and / or the second trip unit 152 drive the locking member 1313 to trip with the mechanism base 1312 in the event of a current fault.

[0055] After the locking element 1313 disengages from the mechanism seat 1312, the mechanism seat 1312 and the moving contact 132 reset under the drive of the contact spring, realizing the automatic opening of the operating mechanism. At this time, the operating element 110 also needs to be driven by the reset spring to return to the open position.

[0056] Optionally, the operating element 110 and / or the connecting rod 120 are provided with a return spring, which is used to drive the operating element 110 and / or the connecting rod 120 to the open position.

[0057] For example, a return spring acts between the connecting rod 120 and the housing 210, driving the connecting rod 120 to move towards the disconnected position, and the connecting rod 120 then drives the operating member 110 to move synchronously. Alternatively, the return spring is a torsion spring, installed on the operating member 110, with one torsion arm of the return spring abutting against the connecting rod 120 and the other torsion arm abutting against the housing 210, causing the connecting rod 120 and the operating member 110 to move towards the disconnected position. Or, the return spring acts between the operating member 110 and the housing 210, directly driving the operating member 110 to move towards the disconnected position. However, in this case, the connecting rod 120 has room to move, and there is a risk that the connecting rod 120 and the free-release assembly 131 may not reset. Therefore, an additional spring can be added between the operating member 110 and the connecting rod 120 to keep the connecting rod 120 on the side of the second slide groove 113 on the operating member 110 near the disconnected position.

[0058] The connecting rod 120 enters the first slide groove 1311 and disengages from the locking member 140. Under the action of the return spring, the operating member 110 and the connecting rod 120 return to the disconnected position, and the second end of the connecting rod 120 returns to the connecting rod abutment surface 1311a of the first slide groove 1311, ready for the next closing.

[0059] Optionally, the locking member 1313 is provided with a short-circuit protection trip end 1313a and an overload protection trip end 1313b, wherein the short-circuit protection trip end 1313a is used to cooperate with the first trip unit 151, and the overload protection trip end 1313b is used to cooperate with the second trip unit 152.

[0060] When a short-circuit fault occurs, the first trip unit 151 drives the locking element 1313 to actuate through the short-circuit protection trip terminal 1313a, thereby releasing it from the mechanism base 1312. When an overcurrent fault occurs, the second trip unit 152 drives the locking element 1313 to actuate through the overload protection trip terminal 1313b, thereby releasing it from the mechanism base 1312.

[0061] Furthermore, the short-circuit protection trip end 1313a is a short-circuit protection trip boss, and the overload protection trip end 1313b is an overload protection trip mounting groove.

[0062] Optionally, the locking element 1313 is further provided with a mechanism seat limiting surface 1313c, which abuts against the mechanism seat 1312 to achieve relative fixation between them.

[0063] Optionally, the free release assembly 131 also includes a locking spring 1314, one torsion arm of which abuts against the mechanism seat 1312 and the other torsion arm of which abuts against the locking member 1313.

[0064] Furthermore, the mechanism base 1312 is provided with a first mounting platform 1312a, and the locking member 1313 is provided with a second mounting platform 1313d. The first mounting platform 1312a abuts against one torsion arm of the locking spring 1314, and the second mounting platform 1313d abuts against the other torsion arm of the locking spring 1314.

[0065] This embodiment also provides a circuit breaker 200, including a housing 210, a stationary contact 220 disposed in the housing 210, and an operating mechanism as described above, wherein the moving contact mechanism 130 of the operating mechanism cooperates with the stationary contact 220.

[0066] The circuit breaker 200 includes the same structure and beneficial effects as the operating mechanism in the foregoing embodiments. The structure and beneficial effects of the operating mechanism have been described in detail in the foregoing embodiments and will not be repeated here.

[0067] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An operating mechanism disposed within a housing (210), characterized in that, include: The device comprises an operating element (110), a connecting rod (120), a locking element (140), and a moving contact mechanism (130). The first end of the connecting rod (120) is driven to the operating element (110), and the second end is driven to the moving contact mechanism (130). The first end of the locking element (140) is driven to the operating element (110), and the second end abuts against the second end of the connecting rod (120) in the closed state, so that the moving contact mechanism (130) is kept in the closed position.

2. The operating mechanism as described in claim 1, characterized in that, The locking member (140) is rotatably disposed within the housing (210). The locking member (140) is provided with a locking spring, which causes the locking member (140) to maintain a tendency to rotate in a first direction, so that the locking member (140) presses the connecting rod (120) in the closed state, thereby causing the connecting rod (120) to press the moving contact mechanism (130).

3. The operating mechanism as described in claim 2, characterized in that, The first end of the locking member (140) is provided with a release surface (141), and the operating member (110) is provided with a first release boss (111). The first release boss (111) is used to drive the release surface (141) to rotate in a second direction opposite to the first direction so that the locking member (140) is separated from the connecting rod (120).

4. The operating mechanism as described in claim 1, characterized in that, The second end of the locking member (140) is provided with a bearing surface (143), and the second end of the connecting rod (120) is provided with a bearing boss (121). The bearing surface (143) is used to abut against the bearing boss (121).

5. The operating mechanism as described in claim 1, characterized in that, The movable contact mechanism (130) is rotatably disposed within the housing (210). The movable contact mechanism (130) is provided with a contact spring. When the movable contact mechanism (130) is in the closed position, the contact spring is in a deformable energy storage state.

6. The operating mechanism as described in claim 5, characterized in that, The moving contact mechanism (130) includes a free trip assembly (131) and a moving contact (132). The moving contact (132) is driven to the free trip assembly (131), and the free trip assembly (131) is driven to the second end of the connecting rod (120).

7. The operating mechanism as described in claim 6, characterized in that, It also includes a first trip unit (151) and / or a second trip unit (152), the first trip unit (151) being used to drive the free trip assembly (131) to trip in the event of a short-circuit fault, and the second trip unit (152) being used to drive the free trip assembly (131) to trip in the event of an overcurrent fault.

8. The operating mechanism as described in claim 7, characterized in that, The free-trip assembly (131) includes a mechanism seat (1312) and a locking member (1313). The moving contact (132) is elastically connected to the mechanism seat (1312). The mechanism seat (1312) and the locking member (1313) together define the range of motion of the second end of the connecting rod (120). The first trip unit (151) and / or the second trip unit (152) drive the locking member (1313) to trip from the mechanism seat (1312) in the event of a current fault.

9. The operating mechanism as described in claim 1, characterized in that, The operating element (110) and / or the connecting rod (120) are provided with a reset spring, which is used to drive the operating element (110) and / or the connecting rod (120) to move to the open position.

10. A circuit breaker, characterized in that, It includes a housing (210), a stationary contact (220) disposed within the housing (210), and an operating mechanism as described in any one of claims 1 to 9, wherein a moving contact mechanism (130) of the operating mechanism cooperates with the stationary contact (220).

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