CN220106410U - Auxiliary contact for circuit breaker - Google Patents

Abstract

The utility model provides an auxiliary contact for circuit breaker, includes micro-gap switch (1), thereby pivot (3) can pass through drive mechanism (2) linkage micro-gap switch (1) switch-on or break off and show the break-in state of circuit breaker, its characterized in that: in the rotation process of the rotating shaft (3), idle stroke exists relative to the transmission mechanism (2), and in the rotation process of the rotating shaft (3) relative to the transmission mechanism (2) and idle stroke, linkage action is not generated between the rotating shaft (3) and the transmission mechanism (2). Through the setting of idle stroke, when the mechanism brake-separating stroke is insufficient, the state display of auxiliary contact still can accomplish the switch, and when the moving contact brake-separating, even take place the action that kick-backs also can not trigger auxiliary contact simultaneously, micro-gap switch assembly to the housing after, micro-gap switch just can reliably fix through simple buckle, and micro-gap switch can very convenient get out, if the inside certain micro-gap switch of auxiliary switch trouble, can only change the micro-gap switch of trouble, has reduced the cost of maintaining.

Description

Auxiliary contact for circuit breaker

Technical Field

The utility model belongs to the technical field of circuit breakers, and particularly relates to an auxiliary contact for a circuit breaker.

Background

The auxiliary contact of the circuit breaker is an accessory which is used for reflecting the on-off state of the movable contact and the fixed contact of the circuit breaker, and when the main loop is opened or closed, the auxiliary contact can perform certain conversion along with the action of the main loop. The feedback of the on-off signals of the auxiliary contact is an important basis of the on-off state of the main loop, the auxiliary contact generally comprises a micro switch and a transmission assembly, the transmission assembly of the auxiliary contact is generally connected with an operating mechanism, the operating mechanism is connected with a moving contact, and the auxiliary switch can follow actions when the moving contact is in an off-state or an on-state. The action switching of the auxiliary contacts is generally embodied by the action of a micro switch, and generally, one auxiliary switch has a plurality of micro switches installed in a housing.

In the prior art, when the auxiliary contact works, the following defects exist:

firstly, in normal running condition of the circuit breaker, when the circuit breaker is closed, the stroke angle of an operating mechanism is 50 degrees, and when the circuit breaker is opened, the stroke angle of the operating mechanism is 50 degrees, but as the circuit breaker is operated and is frequently opened and closed, the soft connection in the moving contact system becomes stiff, so that the operating mechanism cannot pull the moving contact by 50 degrees, the opening stroke is reduced, in the existing structure, the auxiliary switch is switched when the circuit breaker is opened, the auxiliary switch is all relied on the opening stroke, when the circuit breaker is operated to a certain service life, the opening stroke is reduced, the condition that the circuit breaker is opened but the auxiliary switch is not completed to display an error state is caused.

And secondly, when the breaker is opened, the energy is larger, and when the breaker is opened, the moving contact and the operating mechanism rebound for a plurality of times, and the action of the auxiliary switch is related to the operating mechanism, the rebound of the operating mechanism can lead to repeated on-off of the auxiliary switch, so that the accuracy of feedback signals of the auxiliary switch is affected.

Finally, if the existing auxiliary switch fails, the whole auxiliary switch needs to be replaced, the maintenance and replacement cost of the product is high, and the replacement process is complicated.

Disclosure of Invention

The utility model aims to overcome the defects of the conventional auxiliary switch in the use process, and provides an auxiliary contact for a circuit breaker, wherein the auxiliary contact is arranged on the circuit breaker, the state display of the auxiliary contact can still finish switching when the opening stroke of a mechanism is insufficient, and meanwhile, the action of the auxiliary contact can not be triggered even if rebound occurs when a moving contact is opened, so that the whole auxiliary contact is simple and convenient to replace and maintain.

Technical proposal

In order to achieve the technical purpose, the auxiliary contact for the circuit breaker provided by the utility model comprises a micro switch, wherein the micro switch is linked with a rotating shaft of an operating mechanism of the circuit breaker through a transmission mechanism, and the rotating shaft rotates to drive a moving contact and a fixed contact of the circuit breaker to switch on and off, and the rotating shaft can be linked with the micro switch through the transmission mechanism to display the switching-on and switching-off state of the circuit breaker, and the auxiliary contact is characterized in that: and in the rotating process of the rotating shaft, idle stroke exists relative to the transmission mechanism, and in the rotating process of the rotating shaft relative to the idle stroke of the transmission mechanism, linkage action is not generated between the rotating shaft and the transmission mechanism.

In one embodiment, the microswitch is mounted in a microswitch mounting slot in the housing.

In one embodiment, the driving mechanism is arranged in a driving chute in the housing and can slide up and down, and the driving mechanism is arranged in the driving chute in the housing and can be linked with the micro switch in the process of sliding up and down.

In one embodiment, the transmission mechanism comprises a pull plate, the pull plate is arranged in a transmission chute in the housing and can slide up and down, a protrusion is arranged on the pull plate and is linked with a button of the micro switch, and the protrusion can release or trigger the button of the micro switch in the process of sliding up and down in the transmission chute in the housing;

the lower end of the pulling plate is connected with one end of a connecting rod, and the other end of the connecting rod is connected with a rotating shaft of an operating mechanism of the circuit breaker;

the pull plate is connected with a reset piece which can provide reset force for the pull plate to slide upwards in the transmission chute.

In one embodiment, a connecting table is arranged at the lower end of the pull plate, a pin penetrates through a first waist-shaped hole at one end of the connecting rod and a connecting hole at the connecting table, clamping springs are arranged at two ends of the pin to limit the pin, a second waist-shaped hole is arranged at the other end of the connecting rod, a linkage shaft is arranged on a cantilever on a rotating shaft of an operating mechanism of the circuit breaker, a first limiting groove is arranged on the linkage shaft, and the first limiting groove is positioned in the second waist-shaped hole to connect the linkage shaft with the connecting rod.

In one embodiment, the rotating shaft of the operating mechanism of the circuit breaker has a idle stroke rotating relative to the transmission mechanism in the process of rotating from the opening position to the closing position, and the connecting rod is not linked by a linkage shaft on the rotating shaft in the process of rotating the rotating shaft in the idle stroke, so that the pulling plate is not linked by the rotating shaft.

In one embodiment, when the breaker is in the opening position, the first rotation center of the rotating shaft of the operating mechanism is O1, the center of the connecting hole on the pull plate is O2, the center of the linkage shaft on the cantilever is O3, the included angle between the connecting line between the first rotation center of the rotating shaft and the center of the linkage shaft and the connecting line between the first rotation center of the rotating shaft and the center of the connecting hole is a, the idle stroke of the rotating shaft of the operating mechanism of the breaker is between 0 and 2a degrees,

preferably, the idle stroke angle is greater than 15 degrees and a is between 7.6 and 12 degrees.

In one embodiment, the reset element is a spring, one end of the spring is hung in a first U-shaped groove of the housing, and the other end of the spring is hung in a second U-shaped groove of the pull plate.

In one embodiment, the upper side of the housing is provided with an outlet for the wiring of the micro-switch wire, and the housing is mounted on an upper cover plate of the operating mechanism.

In one embodiment, the cover plate is assembled with the housing by a snap-fit arrangement.

In one embodiment, the fastening structure comprises a limiting protrusion on the housing, a limiting groove II corresponding to the limiting protrusion is formed in the cover plate, a locking protrusion is arranged on the cover plate, a locking groove matched and corresponding to the locking protrusion is formed in the housing, and an unlocking boss for pulling the locking protrusion is further arranged on the cover plate.

Advantageous effects

According to the auxiliary contact for the circuit breaker, the micro switch is linked with the rotating shaft of the operating mechanism of the circuit breaker through the transmission mechanism, an idle stroke exists in the rotating process of the rotating shaft relative to the transmission mechanism, and no linkage action is generated between the rotating shaft and the transmission mechanism in the idle stroke rotating process of the rotating shaft relative to the transmission mechanism. Through the setting of idle stroke, when the mechanism brake-separating stroke is insufficient, the state display of auxiliary contact still can accomplish the switch, and when the moving contact brake-separating, even take place the action that kick-backs also can not trigger auxiliary contact simultaneously, micro-gap switch assembly to the housing after, micro-gap switch just can reliably fix through simple buckle, and micro-gap switch can very convenient get out, if the inside certain micro-gap switch of auxiliary switch trouble, can only change the micro-gap switch of trouble, has reduced the cost of maintaining.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an auxiliary switch product in an embodiment of the utility model;

FIG. 2 is a schematic view of the positions of a housing, a cover plate and a micro switch in an embodiment of the utility model;

FIG. 3 is a schematic view of a housing structure in an embodiment of the utility model;

FIG. 4 is a schematic view of a cover plate structure according to an embodiment of the present utility model;

FIG. 5 is a front view of a cover and lid combination in an embodiment of the utility model;

FIG. 6 is a cross-sectional view in the V-direction of FIG. 5;

FIG. 7 is a schematic diagram of a transmission structure product in an embodiment of the utility model;

FIG. 8 is a schematic drawing of a pulling plate according to an embodiment of the present utility model;

FIG. 9 is a schematic view of a connecting rod structure according to an embodiment of the present utility model;

FIG. 10 is a schematic diagram of the connection relationship between auxiliary contacts and a circuit breaker in an embodiment of the utility model;

FIG. 11 is a schematic diagram of auxiliary contacts when the interrupt circuit breaker is in an open state according to an embodiment of the present utility model;

FIG. 12 is a schematic diagram of an auxiliary contact when the interrupt circuit is in a closed state according to an embodiment of the present utility model;

FIG. 13 is a schematic diagram of critical position and idle stroke angle in an embodiment of the present utility model;

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and the like are used in the description of the present utility model for the purpose of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" on a second feature may be that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through intermedial media. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of the present utility model have the same meaning as commonly understood by one of ordinary skill in the art to which this utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. The term "and/or" as used in the description of the present utility model includes any and all combinations of one or more of the associated listed items.

Examples

As shown in fig. 1, fig. 2 and fig. 10, an auxiliary contact for a circuit breaker comprises a micro switch 1, the micro switch 1 is linked with a rotating shaft 3 of an operating mechanism of the circuit breaker through a transmission mechanism 2, in the process that the rotating shaft 3 rotates to drive a moving contact 4 and a fixed contact 5 of the circuit breaker to conduct switching-on and switching-off, the rotating shaft 3 can be linked with the micro switch 1 through the transmission mechanism 2 to conduct switching-on or switching-off so as to display the switching-on and switching-off state of the circuit breaker, as shown in fig. 13, an idle stroke exists relative to the transmission mechanism 2 in the rotating process of the rotating shaft 3, and in the idle stroke rotating process of the rotating shaft 3 relative to the transmission mechanism 2, linkage action is not generated between the rotating shaft 3 and the transmission mechanism 2. Through the setting of idle stroke, when the mechanism brake-separating stroke is insufficient, the state display of auxiliary contact still can accomplish the switch, and when the moving contact brake-separating, even take place the resilience also can not trigger the action of auxiliary contact simultaneously.

The specific structure of the present embodiment will be further described with reference to the accompanying drawings, and as shown in fig. 2, the micro switch 1 is mounted in a micro switch mounting groove 601 in the housing 6. The upper side of the housing 6 is provided with an outlet for conducting wires of the micro switch 1, and the housing 6 is arranged on an upper cover plate 7 of the operating mechanism. In this embodiment, the micro-switches 3 in the housing 1 are symmetrically arranged, preferably four, and the cover plate 8 is assembled with the housing 6 by a snap-fit structure. The transmission mechanism 2 is arranged in a transmission chute 602 in the housing 6 and can slide up and down, and the transmission mechanism 2 is arranged in the transmission chute 602 in the housing 6 and can be linked with the micro switch 1 in the process of sliding up and down.

In this embodiment, as shown in fig. 3,4,5 and 6 in combination, the fastening structure includes a limiting protrusion 604 on the housing 6, a limiting groove 801 corresponding to the limiting protrusion 604 is provided on the cover plate 8, a locking protrusion 802 is provided on the cover plate 8, a locking groove 605 corresponding to the locking protrusion 802 is provided on the housing 6, and an unlocking boss 803 for pulling the locking protrusion 802 is further provided on the cover plate 8. When the cover plate 8 is mounted, the cover plate 8 and the housing 6 can be attached first, then the second limiting groove 801 corresponding to the corresponding limiting protrusion 604 of the cover plate 8 and the housing 6 is aligned, and the cover plate 8 is slid downwards, so that the locking protrusion 802 of the cover plate 8 can be smoothly clamped into the locking groove 605 of the housing 6. When the cover plate 8 and the cover plate 8 are to be combined together are detached, the cover plate 6 and the cover plate 8 can be unlocked by pulling the unlocking boss 803 of the cover plate 8 laterally and sliding upwards. After the micro switch is assembled to the housing, the micro switch can be reliably fixed through a simple buckle, the micro switch can be conveniently taken out, and if one micro switch in the auxiliary switch fails, only the failed micro switch can be replaced, so that the maintenance cost is reduced.

As shown in fig. 7, further, the transmission mechanism 2 includes a pull plate 201, where the pull plate 201 is installed in a transmission chute 602 in the housing 6 and can slide up and down, as shown in fig. 8, a protrusion 201a is provided on the pull plate 201, and the protrusion 201a is linked with the button 101 of the micro switch 1, and the protrusion 201a can release or trigger the button 101 of the micro switch 1 during the up and down sliding process of the pull plate 201 installed in the transmission chute 602 in the housing 6; the lower end of the pull plate 201 is connected with one end of a connecting rod 202, and the other end of the connecting rod 202 is connected with a rotating shaft 3 of an operating mechanism of the circuit breaker; the pull plate 201 is connected with a restoring member 203 capable of providing a restoring force for the pull plate to slide upward in the driving chute 602. In this embodiment, as shown in fig. 1, the restoring member 203 is a spring, one end of the spring is hung in the U-shaped groove one 603 of the housing 6, and the other end of the spring is hung in the U-shaped groove two 201c on the pull plate 201. As shown in fig. 8, a connection table 201b is disposed at the lower end of the pull plate 201, a pin 204 passes through a first waist-shaped hole 202a at one end of the connecting rod 202 and a connection hole 201b01 at the connection table 201b, two ends of the pin 204 are provided with a clamp spring 205 for limiting, as shown in fig. 9, the other end of the connecting rod 202 is provided with a second waist-shaped hole 202b, as shown in fig. 10, a cantilever 301 on a rotating shaft 3 of an operating mechanism of the circuit breaker is provided with a linkage shaft 302, the linkage shaft 302 is provided with a first limiting groove 302a, and the first limiting groove 302a is located in the second waist-shaped hole 202b to realize connection between the linkage shaft 302 and the connecting rod 202.

As shown in fig. 11, in the opening position, the operating mechanism of the circuit breaker is in the opening position, the moving contact 4 is disconnected from the fixed contact 5, the button 101 of the micro switch 1 is located under the protrusion 201a of the pull plate 201, the micro switch 1 is in a released state, and the distance between the center of the connecting hole 201b01 of the pull plate 201 and the cover plate is H1. The first rotation center of the rotating shaft 3 of the operating mechanism is O1, the center of the connecting hole 201b01 on the pull plate 201 is O2, the center of the linkage shaft 302 on the cantilever 301 is O3, and the included angle between the connecting line between the first rotation center of the rotating shaft 3 and the center of the linkage shaft 302 and the connecting line between the first rotation center of the rotating shaft 3 and the center of the connecting hole 201b01 is a.

As shown in fig. 12, when the operating mechanism of the circuit breaker is in the closing position, the moving contact 4 is connected with the fixed contact 5, the button 101 of the micro switch 1 is pressed by the protrusion 201a of the pull plate 201, the micro switch 1 is in the triggering state, and the distance between the center of the connecting hole 201b01 of the pull plate 201 and the cover plate is H2.

The working principle of the embodiment is as follows: the switching-on process, i.e. the movement of the circuit breaker from the starting switching-off position to the switching-on position, takes place. The switching process of the operating mechanism and the auxiliary switch of the specific breaker is as follows: the rotating shaft 3 of the operating mechanism rotates 50 degrees anticlockwise, the cantilever 301 synchronously rotates 50 degrees, the linkage shaft 302 connected with the cantilever drives the pull plate 201 to move downwards in the transmission chute 602 of the housing 6, the protrusion 201a of the pull plate 201 also slides downwards gradually, the micro switch 1 is pressed into a triggering state, and the auxiliary switch completes one state conversion.

The breaking process, i.e. the movement of the circuit breaker from the starting closing position to the breaking position. The switching process of the operating mechanism and the auxiliary switch of the specific breaker is as follows: the rotating shaft 3 of the operating mechanism rotates clockwise by 50 degrees, the operating mechanism rotates fast, the cantilever 301 rotates synchronously, the linkage shaft 302 moves fast in the waist-shaped hole II 202b at the other end of the connecting rod 202, a certain gap is further generated in the waist-shaped hole II 202b, the linkage shaft 302 is temporarily not pulling the connecting rod 202, meanwhile, the pull plate 201 can be pulled to slide upwards because the spring can provide upward pulling force, the bulge 201a of the pull plate 201 gradually cancels pressing on the micro switch 1, the micro switch 1 restores the released (free) state, the auxiliary switch completes one-time state conversion,

in the opening position, the position where the cantilever 301 rotates clockwise by 2a ° is referred to as a critical operation position, and the center of the coupling shaft 302 on the cantilever 301 that moves to the critical operation position is set to O3'. The included angle between the O1O3 'connecting line and the O1O2 connecting line is a, the included angle between the O1O3 (indicated by the dotted line) connecting line at the opening position and the O1O3' connecting line at the critical action position is 2a degrees, as shown in figure 13,

in general, in the prior art, when the cantilever rotates clockwise by 50 ° and rotates within 0 ° to 2a °, the pull plate 201 can be kept in place without being affected by the rotation of the cantilever 301, so that the micro switch 1 is kept in a released (natural) state continuously, and therefore, the stroke of the rotating shaft at the section of 0 ° to 2a ° is an idle stroke.

In the following, it is further explained how the extent of the idle stroke is determined, in the prior art, the rebound of the operating mechanism is generally not more than 15 ° when opening the brake; with the stiffness of the soft connection of the moving contact of the circuit breaker, the opening angle of the operating mechanism is reduced, but not reduced to below 40 degrees, and the two points are combined, only the idle stroke angle is designed to be more than 15 degrees, so that the cantilever is equivalent to idling in the rotating process of 0-2 a degrees, the pull plate 201 does not move downwards, the distance between the center of the connecting hole 201b01 of the pull plate 201 and the cover plate 8 is continuously kept at H1, so that the micro switch 1 is continuously kept in a release state, and the problem that the switching can still be completed when the opening stroke of the operating mechanism is insufficient can be solved; the problem that the action of the auxiliary contact is not triggered even if rebound when the movable contact is opened can be solved, and in the embodiment, the size of a is preferably 7.6-12 degrees. However, the above description does not represent that the idle stroke angle can be designed to be more than 15 °, the size of a is only 7.6 ° to 12 °, and the idle stroke and the size of a can be adjusted and valued according to the technical principle of the present embodiment according to the actual situation of the circuit breaker product by a person skilled in the art, but the adjustment and the valued should be considered to fall within the protection scope of the present utility model.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the utility model and are described in detail herein without thereby limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.

Claims (10)

1. The utility model provides an auxiliary contact for circuit breaker, includes micro-gap switch (1), micro-gap switch (1) is linked through actuating mechanism (2) and operating mechanism's of circuit breaker pivot (3), pivot (3) rotate and drive moving contact (4) and fixed contact (5) of circuit breaker and carry out the in-process of closing and breaking brake, pivot (3) can pass through actuating mechanism (2) linkage micro-gap switch (1) switch-on or break off thereby show the on-off state of circuit breaker, its characterized in that: in the rotation process of the rotating shaft (3), idle stroke exists relative to the transmission mechanism (2), and in the rotation process of the rotating shaft (3) relative to the transmission mechanism (2) and idle stroke, linkage action is not generated between the rotating shaft (3) and the transmission mechanism (2).

2. An auxiliary contact for a circuit breaker as claimed in claim 1, wherein: the micro switch (1) is arranged in a micro switch mounting groove (601) in the housing (6).

3. An auxiliary contact for a circuit breaker as claimed in claim 2, wherein: the transmission mechanism (2) is arranged in a transmission chute (602) in the housing (6) and can slide up and down, and the transmission mechanism (2) is arranged in the transmission chute (602) in the housing (6) and can be linked with the micro switch (1) in the process of sliding up and down.

4. An auxiliary contact for a circuit breaker as claimed in claim 3, wherein: the transmission mechanism (2) comprises a pull plate (201), wherein the pull plate (201) is arranged in a transmission chute (602) in the housing (6) and can slide up and down, a protrusion (201 a) is arranged on the pull plate (201), the protrusion (201 a) is linked with a button (101) of the micro switch (1), and the protrusion (201 a) can release or trigger the button (101) of the micro switch (1) in the process of sliding up and down in the transmission chute (602) in the housing (6);

the lower end of the pull plate (201) is connected with one end of a connecting rod (202), and the other end of the connecting rod (202) is connected with a rotating shaft (3) of an operating mechanism of the circuit breaker;

the pull plate (201) is connected with a reset piece (203) which can provide a reset force for the pull plate to slide upwards in the transmission chute (602).

5. The auxiliary contact for a circuit breaker according to claim 4, wherein: the lower extreme of arm-tie (201) is provided with connecting bench (201 b), and pin (204) pass waist hole one (202 a) on connecting bench (201 b) on connecting rod (202) one end and connecting hole (201 b 01), jump ring (205) are spacing is equipped with at pin (204) both ends, the other end of connecting rod (202) is provided with waist hole two (202 b), is equipped with on cantilever (301) on operating mechanism's of circuit breaker pivot (3) linkage shaft (302), be provided with spacing groove one (302 a) on linkage shaft (302), spacing groove one (302 a) are located waist hole two (202 b) and are realized linkage shaft (302) with the connection of connecting rod (202).

6. The auxiliary contact for a circuit breaker according to claim 5, wherein: a rotating shaft (3) of an operating mechanism of the circuit breaker has a idle stroke rotating relative to the transmission mechanism (2) in the process of rotating from a switching-off position to a switching-on position, and the connecting rod (202) is not linked by a linkage shaft (302) on the rotating shaft (3) in the process of rotating the rotating shaft (3) in the idle stroke, so that the pull plate (201) is not linked by the rotating shaft (3);

when the breaker is in the opening position, the first rotation center of the rotating shaft (3) of the operating mechanism is O1, the center of the connecting hole (201 b 01) on the pulling plate (201) is O2, the center of the linkage shaft (302) on the cantilever (301) is O3, the included angle between the connecting line between the first rotation center of the rotating shaft (3) and the center of the linkage shaft (302) and the connecting line between the first rotation center of the rotating shaft (3) and the center of the connecting hole (201 b 01) is a, and the idle stroke of the rotating shaft (3) of the operating mechanism of the breaker is between 0 and 2a degrees.

7. The auxiliary contact for a circuit breaker according to claim 6, wherein: the idle stroke angle is more than 15 degrees, and a is between 7.6 and 12 degrees.

8. The auxiliary contact for a circuit breaker according to claim 4, wherein: the reset piece (203) is a spring, one end of the spring is hung in a first U-shaped groove (603) of the housing (6), and the other end of the spring is hung in a second U-shaped groove (201 c) on the pull plate (201).

9. An auxiliary contact for a circuit breaker as claimed in claim 2, wherein: an outlet for conducting wires of the micro switch (1) is formed in the upper side of the housing (6), and the housing (6) is arranged on an upper cover plate (7) of the operating mechanism.

10. An auxiliary contact for a circuit breaker as claimed in claim 1, wherein: the cover plate (8) is assembled with the housing (6) through a fastening structure;

the buckle structure comprises a limiting protrusion (604) on a cover shell (6), a limiting groove II (801) corresponding to the limiting protrusion (604) is arranged on a cover plate (8), a locking protrusion (802) is arranged on the cover plate (8), a locking groove (605) corresponding to the locking protrusion (802) in a matching mode is arranged on the cover shell (6), and an unlocking boss (803) for pulling the locking protrusion (802) is further arranged on the cover plate (8).