CN214848441U

CN214848441U - Operating mechanism and miniature circuit breaker

Info

Publication number: CN214848441U
Application number: CN202120697640.8U
Authority: CN
Inventors: 李强; 连云飞; 谢亚丽
Original assignee: Shanghai Liangxin Electrical Co Ltd
Current assignee: Shanghai Liangxin Electrical Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2021-11-23
Anticipated expiration: 2031-04-06

Abstract

The utility model provides an operating mechanism and miniature circuit breaker, relate to low-voltage apparatus technical field, operating mechanism includes the active part, the action spare, first elastic component and moving contact, wherein, drive the connection with the active part, the action spare rotates with the moving contact and is connected, first elastic component then is connected with the moving contact, first elastic component after being connected with the moving contact can provide the effort to the moving contact, the effort can make the moving contact have the trend of butt with the action spare, and active part and action spare syntropy rotate, thus, through active part and action spare syntropy rotation in operating mechanism, the moving contact sets up on the action spare and realizes the effect purpose of different states through first elastic component, thereby required spare part when effectual reduction operating mechanism realizes the divide-shut brake, not only be favorable to improving operating mechanism's stability, reduce the fault rate, the occupied space of the operating mechanism in the shell of the circuit breaker can be reduced, and the miniaturization of the circuit breaker is further facilitated.

Description

Operating mechanism and miniature circuit breaker

Technical Field

The utility model relates to a low-voltage apparatus switch technical field particularly, relates to an operating device and miniature circuit breaker.

Background

With the rapid development of economy, the living standard of people is rapidly improved, and the safety of household electricity utilization is required to be higher. The circuit breaker may be installed in a terminal distribution line. Meanwhile, the circuit can be connected, carried and disconnected under the condition of normal or abnormal circuit, and the circuit and the electrical equipment are effectively protected.

The existing circuit breaker is usually provided with an operating mechanism in a shell, and the operating mechanism needs to contain more transmission parts for realizing switching-on and switching-off operations, but in actual use, the more transmission parts are difficult to be matched well, so that the phenomenon of blocking is easy to occur, and the occupied space is large, so that the miniaturization of the circuit breaker is not facilitated.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a to the not enough among the above-mentioned prior art to the problem of solution.

In order to achieve the above object, the embodiment of the present invention adopts the following technical solutions:

the utility model discloses an aspect provides an operating device is applied to the circuit breaker casing, include: the device comprises a driving part, an action part, a first elastic part and a moving contact; the first elastic element is connected with the moving contact and used for providing acting force for the moving contact so that the moving contact has a tendency of abutting against the action piece; the driving part drives the action part to move in the same direction under the driving of external force so as to drive the moving contact to open or close.

Optionally, a first position on the action member is rotationally connected with the circuit breaker housing, a second position on the action member is rotationally connected with the moving contact, and a connection position of the first elastic member and the moving contact is located between the first position and the second position so that one end of the moving contact close to the first position has a tendency of abutting against the action member.

Optionally, the operating mechanism further includes a connecting rod, the driving member is rotatably disposed in the circuit breaker housing, and the driving member drives the operating member through the connecting rod and rotates in the same direction as the operating member.

Optionally, the operating mechanism further comprises a clamping piece and a releasing piece; the relative both ends of joint spare rotate respectively to be connected in action piece and connecting rod, and the fastener that takes off rotates to set up in circuit breaker casing, joint spare and the fastener joint of taking off in order when the drive piece drive connecting rod, drive joint spare drive action piece and fastener rotation respectively make the movable contact move towards the combined floodgate direction.

Optionally, the operating mechanism further comprises a second elastic part, and the second elastic part is connected with the disengaging part and used for providing resetting force for the disengaging part when the disengaging part and the clamping part are in a clamping state.

Optionally, still be provided with spacing boss on the action spare, spacing boss is used for when the moving contact moves towards the separating brake direction, and is spacing with joint spare butt.

Optionally, the second elastic element is one of a plate spring, a torsion spring and a tension spring; the second elastic piece and the tripping piece are coaxially arranged, or the second elastic piece is arranged on the shell of the circuit breaker.

Optionally, the operating mechanism further comprises a draw bar, one end of the draw bar is rotatably connected with the trip piece, and the other end of the draw bar is used for being arranged corresponding to the thermal trip piece.

Optionally, a through groove is formed in the action piece, the movable contact part is located in the through groove and is respectively connected with two groove walls opposite to the through groove in a rotating mode, and the first elastic piece is connected with the movable contact located in the through groove.

In one aspect of the embodiments of the present invention, a miniature circuit breaker is provided, which includes a circuit breaker housing, a static contact and any one of the above-mentioned operating mechanisms; the operating mechanism and the static contact are positioned in the shell of the circuit breaker, and the static contact and the moving contact of the operating mechanism are correspondingly arranged.

The beneficial effects of the utility model include:

the utility model provides an operating mechanism and miniature circuit breaker, operating mechanism includes the active part, the action spare, first elastic component and moving contact, wherein, drive the active part with the action spare and be connected, the action spare rotates with the moving contact and is connected, first elastic component then is connected with the moving contact, first elastic component after being connected with the moving contact can provide the effort to the moving contact, the effort can make the moving contact have the trend with the action spare butt, and active part and action spare syntropy rotate, so, through active part and action spare syntropy rotation in operating mechanism, the moving contact sets up on the action spare and realizes the effect purpose of different states through first elastic component, thereby the required spare part when effectively reducing operating mechanism and realizing the divide-shut brake, not only be favorable to improving operating mechanism's stability, reduce the fault rate, can also reduce operating mechanism's occupation space in the circuit breaker casing, thereby facilitating the miniaturization of the circuit breaker.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic view of an opening state of an operating mechanism according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a closing state of an operating mechanism according to an embodiment of the present invention;

fig. 3 is an exploded view of an operating mechanism according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an operating mechanism according to an embodiment of the present invention;

fig. 5 is a second schematic structural diagram of an operating mechanism according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a miniature circuit breaker according to an embodiment of the present invention.

Icon: 110-an active part; 120-connecting rod; 130-a clip; 140-an action; 141-first position; 142-a second position; 143-a limit boss; 144-a through slot; 150-a first resilient member; 160-moving contact; 170-a release fastener; 171-clamping position; 172-a trip end; 180-a second elastic member; 190-a drawbar; 200-a static contact; 300-a circuit breaker housing; 310-thermal release fasteners; 320-an electromagnetic release; 330-handle.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. It should be noted that, in the case of no conflict, various features in the embodiments of the present invention may be combined with each other, and the combined embodiments are still within the scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "first", "second", "third", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "disposed" and "connected" should be interpreted broadly, and the specific meaning of the terms in the present invention can be understood in specific situations by those skilled in the art.

An aspect of the embodiment of the present invention is to provide an operating mechanism, as shown in fig. 1, applied to a circuit breaker housing 300, and after installing it inside the circuit breaker housing 300, the operating mechanism is driven to move according to the connection relationship by the components such as the handle 330 and the motor as an external force source, so as to move the moving contact 160 at the end of the operating mechanism. When the moving contact 160 moves to the opening or closing position, the corresponding circuit breaker is in the open or closed state, so that the on/off control of the conductive loop where the circuit breaker is located can be realized.

As shown in fig. 1, the operating mechanism includes an active element 110, an action element 140, a first elastic element 150 and a movable contact 160, wherein the active element 110 is drivingly connected to the action element 140, the action element 140 is rotationally connected to the movable contact 160, the first elastic element 150 is connected to the movable contact 160, the first elastic element 150 connected to the movable contact 160 can provide an acting force to the movable contact 160, the acting force can make the movable contact 160 have a tendency of abutting against the action element 140, so that the movable contact 160 and the action element 140 have two contact positions in a process that the movable contact 160 moves in a closing direction, one of the two contact positions is a rotational connection position between the movable contact 160 and the action element 140, the other contact position between the movable contact 160 and the action element 140 has an abutting position under the action of the first elastic element 150, and the movable contact 160 and the action element 140 can move as a whole under the driving of the active element 110 in the closing process, the stability of the movable contacts 160 can be improved. Meanwhile, when the driving member 110 receives an external force, the driving member 110 may drive the actuating member 140 to move together with the driving member 110 in the same direction, for example, clockwise rotation or counterclockwise rotation, so that components required for driving may be effectively simplified, and driving efficiency and stability may be improved.

In addition, as shown in fig. 1, since the movable contact 160 is disposed on the action member 140, when the action member 140 is driven by the driving member 110, the movable contact 160 moves along with the action member 140, so as to avoid disposing an additional transmission member for driving the movable contact 160 by the action member 140, thereby further reducing the number of parts of the operating mechanism.

As shown in fig. 1, the first elastic element 150 is disposed on the basis that the movable contact 160 is rotatably disposed on the operating element 140, so that the movable contact 160 and the operating element 140 are in a butting position, and thus, in view of the purpose of the acting force provided by the first elastic element 150 to the movable contact 160, in the opening position and the closing process, the acting force of the first elastic element 150 to the movable contact 160 corresponds to the resistance of the operating mechanism during closing, so that the operating mechanism can be prevented from being closed by mistake by the acting force of the first elastic element 150, and the safety of the circuit breaker is further improved; as shown in fig. 2, when the movable contact 160 moves to the position of the fixed contact 200 and the movable contact 160 contacts the fixed contact 200, the contact position on the movable contact 160 for contacting the fixed contact 200 and the connection position of the first elastic member 150 and the movable contact 160 are respectively located on two opposite sides of the position where the movable contact 160 is rotationally connected to the operating member 140, for example, the contact position on the movable contact 160 for contacting the fixed contact 200 is located on the right side of the second position 142 in fig. 2, the connection position of the first elastic member 150 and the movable contact 160 is located on the left side of the second position 142 in fig. 2, the abutting position of the movable contact 160 and the operating member 140 and the connection position of the first elastic member 150 and the movable contact 160 are located on the same side of the second position 142, at this time, the right side of the movable contact 160 abuts against the fixed contact 200, and as the continuous movement of the active member 110, the movable contact 160 rotates reversely relative to the operating member 140 with the rotational connection position of the operating member 140 as the center, at this time, the abutting relationship between the movable contact 160 and the action member 140 is released, and the acting force of the first elastic member 150 on the movable contact 160 at this time is to improve the contact pressure between the movable contact 160 and the static contact 200, so that the movable contact 160 and the static contact can be reliably contacted with each other, and thus, the over travel of the circuit breaker during closing can be realized. Therefore, different functions can be provided by the first elastic piece 150 when the circuit breaker is in different states, and the existing arrangement of a plurality of elastic pieces to realize the functions is avoided, so that the number of parts of the operating mechanism can be further reduced.

In summary, the active member 110 and the active member 140 rotate in the same direction, the movable contact 160 is disposed on the active member 140 and the first elastic member 150 is used to achieve the action purpose of different states, so that the number of required components of the operating mechanism in opening and closing is effectively reduced, the stability of the operating mechanism is improved, the failure rate is reduced, the occupied space of the operating mechanism in the circuit breaker housing 300 is reduced, and the miniaturization of the circuit breaker is facilitated.

Alternatively, as shown in fig. 1 and fig. 2, the first position 141 on the moving member 140 is rotatably connected to the circuit breaker housing 300, the second position 142 on the moving member 140 is rotatably connected to the movable contact 160, and the connection position of the first elastic member 150 and the movable contact 160 is located between the first position 141 and the second position 142, so that the movable contact 160 can abut against the moving member 140 at one end close to the first position 141 (hidden from view and not shown) in the opening state or the closing process, and after the closing position is over-travel, the movable contact 160 still has a tendency to maintain abutment although the end close to the first position 141 is separated from the moving member 140, even if the end close to the first position 141 always has a tendency to abut against the moving member 140. Through setting up the position of first elastic component 150 between first position 141 and second position 142, moving contact 160 can the butt at the one end that is close to first position 141 and action 140 to the realization is in when different states at the circuit breaker through first elastic component 150, provides the effort of different purposes, and then makes the circuit breaker have better anti-misoperation nature when separating brake and have better contact conduction performance when closing a floodgate and target in place.

Optionally, as shown in fig. 1 and fig. 2, in order to enable the driving member 110 to drive the operating member 140 to rotate in the same direction, the operating mechanism may further include a connecting rod 120, when the connecting rod 120 is included, the driving member 110 is rotatably disposed in the circuit breaker housing 300, the operating member 140 is rotatably disposed in the circuit breaker housing 300, one end of the connecting rod 120 is rotatably connected to the driving member 110, and the other end of the connecting rod 120 is rotatably connected to the operating member 140, so that the driving member 110 can drive the operating member 140 to rotate in the same direction with the driving member 110 through the connecting rod 120, and in combination with fig. 1 and fig. 2, when the switch is switched on, the driving member 110 is driven by an external force to rotate clockwise, and the connecting rod 120 drives the operating member 140 to rotate clockwise; during opening, the movable contact 160 drives the operating member 140 to rotate counterclockwise under the action of the first elastic member 150, and synchronously drives the driving member 110 to rotate counterclockwise through the connecting rod 120 until the initial state is recovered.

Optionally, as shown in fig. 1 to fig. 3, the operating mechanism further includes a clamping member 130 and a release member 170, and when needed, the operating mechanism can be released from the abutting relationship between the release member 170 and the clamping member 130 through the clamping member 130 and the release member 170, so that the degree of freedom of the operating mechanism is increased, and then the stable state of the operating mechanism at the closing position is destroyed, thereby completing the opening and closing under the driving of the first elastic member 150, and the implementation manner is as follows:

combining the rotation setting positions of the driving part 110, the acting part 140 and the circuit breaker housing 300, on this basis, the driving part 110 rotates to connect one end of the connecting rod 120, the other end of the connecting rod 120 rotates to connect one end of the clamping part 130, the other end of the clamping part 130 rotates to connect the acting part 140, the releasing part 170 rotates to be arranged on the circuit breaker housing 300, the releasing part 170 can be arranged coaxially with or non-coaxially with the acting part 140, one end of the clamping part 130 rotatably connected with the connecting rod 120 is clamped with the releasing part 170, the clamping manner can be exemplified as shown in fig. 1 to 3, a boss is arranged at one end of the clamping part 130 rotatably connected with the connecting rod 120, another boss is arranged on the releasing part 170, and the two bosses are mutually clamped to form the clamping position 171 in fig. 1 to 5.

As shown in fig. 1 to 2, in the opening position or the closing process, one end of the clamping member 130 rotatably connected to the connecting rod 120 is clamped to the release member 170, the other end of the clamping member 130 is rotatably connected to the operating member 140, at this time, the driving member 110 is driven by an external force to rotate clockwise, the connecting rod 120 pushes the clamping member 130, so that the opposite ends of the clamping member 130 act on the operating member 140 and the release member 170, and under the continuous clockwise rotation of the driving member 110, the actuating member 140 and the release member 170 are both pushed to rotate clockwise, based on the action of the first elastic member 150, at this time, the movable contact 160 and the operating member 140 are abutted to form the integral following operating member 140 moving towards the closing direction, that is, moving towards the static contact 200. When the moving contact 160 contacts the static contact 200, the driving element 110 continues to rotate clockwise, at this time, the whole operating mechanism realizes the over travel, and after the over travel position is finished, the whole operating mechanism keeps a stable state, that is, the circuit breaker is in the switching-on position. As shown in fig. 6, the trip unit 170 rotates clockwise when the movable contact 160 moves toward the stationary contact 200 and the over travel is achieved, and when the operating mechanism is closed in place, the trip end 172 of the trip unit 170 is located at the action end of the electromagnetic trip unit 320 in the circuit breaker housing 300.

As shown in fig. 6, when the brake needs to be opened, the action end of the electromagnetic release 320 strikes the trip end 172 of the trip member 170 to drive the trip member 170 to rotate in the counterclockwise direction, at this time, because other components in the operating mechanism are in a stable state, the trip member 170 slides relative to the clamping position 171 of the clamping member 130 until the two components are released from the clamping state, at this time, the degree of freedom of the entire operating mechanism is increased, the stable state of the closing position is maintained to be destroyed, under the action of the first elastic member 150, the components of the operating mechanism such as the operating member 140 and the driving member 110 are driven by the movable contact 160 to move toward the brake opening direction, and during the brake opening process, the driving member 110, the operating member 140 and the trip member 170 all rotate in the counterclockwise direction, thereby returning to the initial brake opening position.

In addition, the operating mechanism may further include a third elastic member, and the third elastic member may act on the active member 110, and may provide an acting force moving towards the opening direction for the active member 110, so that the possibility of the operating mechanism being operated by mistake may be further reduced, and at the same time, when the opening is required, the operating mechanism may be provided with a stronger resetting force together with the first elastic member 150, so as to increase the opening speed of the operating mechanism.

Optionally, as shown in fig. 3 and fig. 4 to fig. 5, the operating mechanism may further include a second elastic member 180, the second elastic member 180 is connected to the release member 170, and a reset force can be provided to the release member 170 through the second elastic member 180, so that after the release member 170 and the fastening member 130 are released from the fastening state, the release member 170 is provided with a reset force when returning to the initial position, and thus, after the operating mechanism returns to the initial position, the fastening member 130 and the release member 170 continue to return to the fastening state, which is convenient for reducing the degree of freedom of the operating mechanism, and reestablishing the stable transmission state of the operating mechanism, so as to prepare for the next switching.

Optionally, as shown in fig. 4, a limiting boss 143 may be further disposed on the action member 140, and the limiting boss 143 is located on one side of the clamping member 130 close to the driving member 110, so that after the clamping state of the release member 170 and the clamping member 130 is released, the initial position state of the clamping member 130 is located in the whole operation mechanism reset process, so as to avoid excessive movement of the clamping member 130, and the release member 170 is convenient to reestablish the clamping relationship with the clamping member 130 under the action of the second elastic member 180.

Alternatively, as shown in fig. 3 and 4, the second elastic member 180 may be one of a plate spring, a torsion spring and a tension spring, and it should be noted that the force provided by the second elastic member 180 should be consistent regardless of the form thereof. When the second elastic member 180 is disposed, it may be disposed in the circuit breaker housing 300 as shown in fig. 4, that is, the second elastic member 180 and the release member 170 are disposed non-coaxially, so that the thickness increase of the operating mechanism in the thickness direction of the circuit breaker can be avoided, and the light and thin circuit breaker can be conveniently implemented. As shown in fig. 5, the second elastic member 180 may be disposed coaxially with the fastening member 170, so as to improve the integrity of the fastening member 170. When the trip device is arranged, one end of the second elastic member 180 abuts against the trip device 170, and the other end abuts against the boss on the circuit breaker shell 300, so that the trip device 170 can be reset accurately in the switching-off process, and the clamping relation is reestablished with the clamping device 130. Similarly, the first elastic member 150 and the third elastic member can be reasonably arranged according to the arrangement position and the arrangement form of the second elastic member 180, and are not further described here.

Optionally, as shown in fig. 6, the operating mechanism may further include a pull rod 190, one end of the pull rod 190 is rotatably connected to the release member 170, the other end of the pull rod 190 is slidably disposed in a chute on the circuit breaker housing 300, and meanwhile, the other end of the pull rod 190 should be disposed or positioned corresponding to the thermal release member 310, as shown in fig. 6, the thermal release member 310 abuts against the other end of the pull rod 190, so that the pull rod 190 is pulled to move to drive the release member 170 to rotate counterclockwise after the thermal release member 310 is heated and expanded and deformed due to abnormal load in a circuit connected to the circuit breaker, thereby releasing the clamping state with the clamping member 130, completing the opening operation, and further improving the safety performance of the circuit breaker.

Optionally, as shown in fig. 3, a through groove 144 may be further disposed on the action member 140, a portion of the movable contact 160 is disposed in the through groove 144, and the movable contact 160 is respectively connected to two groove walls opposite to the through groove 144 in a rotating manner, and the through groove 144 may also be disposed to allow the first elastic member 150 to be connected to the movable contact 160 in the through groove 144, so as to further improve the stability of the connection and the mutual action between the movable contact 160 and the action member 140.

In one aspect of the present invention, as shown in fig. 6, a miniature circuit breaker is provided, which includes a circuit breaker housing 300, a static contact 200 and any one of the above-mentioned operating mechanisms; operating device and static contact 200 are located circuit breaker casing 300, static contact 200 corresponds the setting with operating device's moving contact 160, so, active member 110 and action 140 syntropy through among the operating device rotate, moving contact 160 sets up on action 140 and realizes the effect purpose of different states through first elastic component 150, thereby required spare part when effectual reduction operating device realizes divide-shut brake, not only be favorable to improving operating device's stability, reduce the fault rate, can also reduce operating device's occupation space inside circuit breaker casing 300, and then be convenient for realize the miniaturization of circuit breaker.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An operating mechanism for a circuit breaker housing, comprising: the device comprises a driving part, an action part, a first elastic part and a moving contact; the active part is in driving connection with the action part, the action part is in rotating connection with the moving contact, and the first elastic part is connected with the moving contact and used for providing acting force for the moving contact so that the moving contact has a tendency of abutting against the action part; the driving part drives the action part to move in the same direction under the driving of external force so as to drive the moving contact to open or close.

2. The operating mechanism of claim 1 wherein a first location on said operating member is rotatably coupled to said circuit breaker housing and a second location on said operating member is rotatably coupled to said movable contact, said first resilient member being coupled to said movable contact at a location between said first location and said second location such that an end of said movable contact proximate said first location has a tendency to abut said operating member.

3. The operating mechanism according to claim 1 or 2, further comprising a connecting rod, wherein the driving member is rotatably disposed in the circuit breaker housing, the driving member drives the operating member through the connecting rod, and the driving member and the operating member rotate in the same direction.

4. The operating mechanism of claim 3, further comprising a snap-in member and a release member; the opposite ends of the clamping piece are respectively and rotatably connected to the action piece and the connecting rod, the release piece is rotatably arranged on the circuit breaker shell, and the clamping piece and the release piece are clamped to drive the clamping piece to respectively drive the action piece and the release piece to rotate so that the moving contact moves towards the closing direction when the driving piece drives the connecting rod.

5. The operating mechanism according to claim 4, further comprising a second elastic member connected to the release member for providing a restoring force to the release member when the release member is released from the engagement with the engaging member.

6. The operating mechanism as claimed in claim 4, wherein a limiting boss is further disposed on the operating member, and the limiting boss is used for abutting and limiting with the clamping member when the movable contact moves towards the opening direction.

7. The operating mechanism of claim 5, wherein the second resilient member is one of a leaf spring, a torsion spring, and a tension spring; the second elastic piece with take off the coaxial setting of fastener, or, the second elastic piece set up in circuit breaker casing.

8. The operating mechanism of claim 5, further comprising a drawbar, one end of the drawbar being pivotally connected to the trip member, the other end of the drawbar being adapted to be disposed in correspondence with the thermal trip member.

9. The operating mechanism according to claim 1, wherein a through slot is provided on the operating member, the moving contact portion is located in the through slot and is rotatably connected to two slot walls opposite to the through slot, respectively, and the first elastic member is connected to the moving contact located in the through slot.

10. A miniature circuit breaker comprising a circuit breaker housing, a stationary contact and an operating mechanism as claimed in any one of claims 1 to 9; the operating mechanism and the fixed contact are positioned in the breaker shell, and the fixed contact and the moving contact of the operating mechanism are correspondingly arranged.