CN215933475U

CN215933475U - Double-breakpoint contact electric switch

Info

Publication number: CN215933475U
Application number: CN202122655593.3U
Authority: CN
Inventors: 郑春开; 李子平; 金海勇
Original assignee: Kedu Electric Co Ltd
Current assignee: Kedu Electric Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-03-01
Anticipated expiration: 2031-10-29

Abstract

The utility model provides a double-breakpoint contact electric switch, belonging to the technical field of electric switches, comprising: the double-breakpoint contact device comprises a shell, a first connecting rod, a second connecting rod and a first connecting rod, wherein an operating mechanism and a double-breakpoint contact mechanism are arranged in the shell; at least one row of arc extinguishing chambers are respectively arranged on two sides of the double-breakpoint contact mechanism; the operating mechanism includes: the driving piece is connected with a movable contact frame of the double-breakpoint contact mechanism through a connecting rod, and a kick structure is connected onto the driving piece and has an elastic force for enabling the driving piece to perform quick action when the driving piece moves from a switching-on position to a switching-off position or from the switching-off position to the switching-on position; according to the double-breakpoint contact electric switch, the operating mechanism is matched with the double arc-extinguishing chambers, so that direct-current high voltage can be quickly cut off, and electric arcs are quickly cut and extinguished through the double grid pieces, so that the arc-extinguishing performance of the electric switch is improved, and the service life of the electric switch is prolonged.

Description

Double-breakpoint contact electric switch

Technical Field

The utility model relates to the technical field of electric switches, in particular to a double-breakpoint contact electric switch.

Background

In the prior art, a product for breaking a direct current high voltage is generally in a single-break contact structure, and more grid pieces are ensured to be cut by electric arcs by adopting a multi-stage series connection mode.

However, in the process of breaking the direct current circuit of the common electric switch, the electric arc is not easy to extinguish, especially when the voltage is higher, such as 1500Vdc, the generated electric arc has serious burning loss to electric shock, the service life of the electric switch is greatly reduced, and certain safety risk exists.

The arc extinguishing system and the quick action mechanism of the electric switch are used as core components, the breaking performance and the service life of the electric switch are directly influenced by cutting and extinguishing of electric arcs, and in order to improve the arc extinguishing performance of the electric switch, the design of an arc extinguishing chamber and the quick action mechanism needs to be improved.

SUMMERY OF THE UTILITY MODEL

Therefore, the technical problem to be solved by the utility model is to overcome the defect that an electric arc is not easy to extinguish when the electric switch in the prior art cuts off the direct-current high voltage, thereby providing the double-breakpoint contact electric switch.

In order to solve the above technical problem, the present invention provides a double break point contact electric switch, including: the double-breakpoint contact device comprises a shell, a first connecting rod, a second connecting rod and a first connecting rod, wherein an operating mechanism and a double-breakpoint contact mechanism are arranged in the shell;

the double-breakpoint contact mechanism is positioned in an accommodating cavity of the shell, and at least one row of arc extinguishing chambers are respectively arranged on two sides of the double-breakpoint contact mechanism in the shell;

the double-breakpoint contact mechanism comprises two fixed contacts and two moving contacts, the two moving contacts are connected to a moving contact frame, and the moving contact frame is arranged in the shell in a vertically sliding mode;

the operating mechanism includes: the double-breakpoint contact mechanism comprises an operating handle and a driving piece connected with the operating handle, wherein the driving piece is connected with a movable contact head frame of the double-breakpoint contact mechanism through a connecting rod, a kick structure is connected onto the driving piece, and the kick structure has elastic force for enabling the driving piece to perform quick action when the driving piece moves from a switch-on position to a switch-off position or from the switch-off position to the switch-on position.

Optionally, the housing includes an upper housing and a lower housing, the operating mechanism is disposed in the upper housing, and the upper housing and the lower housing are detachably connected.

Optionally, a plurality of arc striking plates are arranged in the arc extinguishing chamber at intervals along the height direction, each arc striking plate comprises an upper arc striking plate and a lower arc striking plate, and the upper arc striking plates are electrically connected with the static contact in an equipotential manner.

Optionally, a supporting structure matched with the moving contact frame is arranged in the casing, when the moving contact frame moves downwards to the brake separating position, the supporting structure is supported at the bottom end of the moving contact frame, and the supporting structure is electrically connected with the lower lead piece in an equipotential manner.

Optionally, both sides of the lower end of the shell are respectively provided with at least one exhaust port communicated with the arc extinguishing chamber.

Optionally, an arc-shaped chute for connecting the connecting rod is arranged on a driving piece of the operating mechanism, a release piece is further rotatably connected to the driving piece, a clasp is arranged on the release piece, and the driving piece is connected with the connecting rod through the clasp of the release piece.

Optionally, a first elastic member is connected to the release fastener, and the first elastic member has an elastic force that drives the hook of the release fastener to rotate toward the arc chute;

the release member further has: the release shaft, have the release piece that rotates the connection in the casing, work as when the driving piece is located the branch floodgate position, the release piece through rotate can with the cooperation of release shaft, so that the release piece overcomes the elastic force of first elastic component removes rightly the connection of connecting rod.

Optionally, a second elastic element is connected to the bottom of the moving contact frame, and the second elastic element has an elastic force for pulling the moving contact frame downward to disconnect the moving contact and the fixed contact.

Optionally, the housing is provided with: the first limiting assembly and the second limiting assembly are movably connected in the shell respectively; when the driving piece is located at a brake opening position, the first limiting assembly locks the driving piece, and when the driving piece is located at a brake closing position, the second limiting assembly locks the driving piece;

the operating handle is provided with a rotating body sleeved on the rotating shaft, and the rotating body is provided with: a first unlocking part and a second unlocking part protrude outwards in the radial direction, the first unlocking part is provided with an inclined surface or an arc-shaped surface used for shifting the first limiting assembly, and the second unlocking part is provided with an inclined surface or an arc-shaped surface used for shifting the second limiting assembly;

the second spacing subassembly includes: the second locking piece, the second locking piece rotates to be connected in the casing, have on the second locking piece be used for with driving piece complex ka tai, still have on the second locking piece be used for with second tripping member complex second lets the face, the second lets the face for inclined plane or arcwall face.

Optionally, a transmission member is rotatably disposed in the housing, the transmission member has a first end engaged with the second locking member and a second end engaged with the bimetallic strip, the bimetallic strip is connected to the stationary contact, and when the current on the stationary contact is overloaded, the bimetallic strip is heated and deformed to drive the transmission member to rotate, so that the second locking member unlocks the driving member, and the driving member rotates toward the opening position.

Optionally, a linkage member and an electromagnetic mechanism cooperating with the linkage member are rotatably disposed in the housing, one end of the linkage member cooperates with the second end of the transmission member, the linkage member further has a third end facing the electromagnetic mechanism, and the electromagnetic mechanism includes: the iron block is fixedly arranged, and the turning plate is arranged at an interval with the iron block and is movably arranged in the shell; when the current of the electric switch is short-circuited, an electromagnetic field is generated between the turning plate and the iron block, the turning plate and the iron block are attracted, the turning plate turns towards the third end of the linkage piece, so that the linkage piece is driven to be matched with the transmission piece, and the transmission piece enables the second locking piece to unlock the driving piece and enables the driving piece to rotate towards the opening position.

The technical scheme of the utility model has the following advantages:

1. according to the double-breakpoint contact electric switch provided by the utility model, through the cooperation of the operating mechanism and the double arc extinguishing chambers, the direct-current high voltage can be quickly cut off, and meanwhile, the electric arc is quickly cut and extinguished through the double grid pieces, so that the arc extinguishing performance of the electric switch is improved, and the service life of the electric switch is prolonged.

2. According to the double-breakpoint contact electric switch provided by the utility model, the operating mechanism is integrated in the upper shell, the upper shell and the lower shell are detachably connected, and the operating mechanism is more convenient and faster to install through a modular design.

3. The utility model provides a double-breakpoint contact electric switch.A striking plate in an arc extinguish chamber is provided with an upper striking plate and a lower striking plate, a moving contact is separated from a static contact when the switch is switched off, an arc root at one side of an electric arc moves from the static contact to the upper striking plate, an arc root at the other side of the electric arc moves from the moving contact to the lower striking plate, the whole section of elongated electric arc completely enters the arc extinguish chamber under the action of electromagnetic force, a metal grid plate in the arc extinguish chamber divides the long electric arc into short arcs to extinguish, and high temperature generated by the electric arc is exhausted through an exhaust port, so that the temperature in a containing cavity of a shell is reduced.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Figure 1 is a perspective view of one embodiment of a dual break contact electrical switch of the present invention.

Fig. 2 is a front sectional view of fig. 1.

Fig. 3 is a perspective view of the operating mechanism of fig. 2.

Fig. 4 is a front view of the drive member of fig. 3.

Fig. 5 is a perspective view of the release member of fig. 3 attached to the driving member.

Fig. 6 is a schematic view of the operating mechanism in fig. 3 operating from the on position to the off position.

Fig. 7 is a front view of the operating handle.

Fig. 8 is a front view of the second locking member.

Fig. 9 is an enlarged view of the area a in fig. 2.

FIG. 10 is a perspective view of the transmission member of FIG. 9.

Fig. 11 is a perspective view of the linkage of fig. 9.

Description of reference numerals:

1. an upper housing; 2. a lower housing; 3. an operating handle; 4. a drive member; 5. static contact; 6. a moving contact; 7. a first limit component; 8. a second limiting component; 9. a swivel; 10. a first unfastening member; 11. a second unfastening member; 12. a first locking member; 13. a movable contact head frame; 14. a limiting shaft; 15. a horizontal chute; 16. a second locking member; 17. clamping a platform; 18. a connecting rod; 19. an arc striking sheet; 20. a support structure; 21. an exhaust port; 22. a yielding pin; 23. an arc-shaped chute; 24. a through hole; 25. releasing the fastener; 26. a clasp; 27. a trip shaft; 28. unlocking the lock; 29. a test button; 30. a second elastic member; 31. a second concession surface; 32. a transmission member; 33. a first end; 34. a second end; 35. honeysuckle flower and honeysuckle flower; 36. a linkage member; 37. a third end; 38. turning over a plate; 39. and (4) iron blocks.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only 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 specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

The present embodiment provides an electric switch for switching on and off, and specifically, may be a circuit breaker switch.

As shown in fig. 1, a specific embodiment of the electric switch provided for this embodiment includes: the device comprises a shell, wherein the shell comprises an upper shell 1 and a lower shell 2, an operating mechanism is arranged in the upper shell 1, and an accommodating cavity for arranging a double-breakpoint contact mechanism is arranged in the lower shell 2; go up casing 1 with detachably connect between the casing 2 down, specifically, can be for joint, bonding and/or fastener are connected.

As shown in fig. 2, in the housing, the double break contact mechanism includes: the moving contact device comprises two fixed contacts 5 and two moving contacts 6, wherein the two moving contacts 6 are connected to a moving contact frame 13, the moving contact frame 13 is arranged in the shell in a vertically sliding mode, and the operating mechanism is connected to the upper portion of the moving contact frame 13 through a connecting rod 18, so that the moving contact frame 13 moves vertically under the driving of the operating mechanism.

As shown in fig. 1 and 2, two rows of arc extinguishing chambers are respectively disposed on two sides of the double-breakpoint contact mechanism, a plurality of arc striking plates 19 are disposed in the arc extinguishing chambers at intervals along a height direction, each arc striking plate 19 includes an upper arc striking plate and a lower arc striking plate, the upper arc striking plate is equipotentially electrically connected to the static contact 5, the lower arc striking plate is equipotentially electrically connected to a supporting structure 20, and the supporting structure 20 is disposed at the bottom of an accommodating cavity of a housing and is used for being matched with the moving contact holder 13; when the moving contact frame 13 moves downward to the opening position, the supporting structure 20 is supported at the bottom end of the moving contact frame 13, so that the moving contact 6 is electrically connected with the lower contact piece at the same potential. Outside the shell, two exhaust ports 21 communicated with the arc extinguish chamber are respectively arranged on two sides of the lower end of the shell.

As shown in fig. 3, the operating mechanism includes: the brake device comprises an operating handle 3 and a driving piece 4 connected with the operating handle 3, wherein a kick structure is connected between the driving piece 4 and the operating handle 3, and the kick structure has an elastic force for enabling the driving piece 4 to perform quick action when the driving piece 4 moves from a switching-on position to a switching-off position or from the switching-off position to the switching-on position; specifically, it may be set such that: operating handle 3 and driving piece 4 are connected through the third elastic component between, when driving piece 4 is locked in separating brake position or closing position, at this moment, carry out pivoted initial stage at drive operating handle 3, driving piece 4 can not rotate along with operating handle 3 to make the third elastic component carry out the energy storage, work as operating handle 3 rotates certain angle back, and the locking of driving piece 4 is removed to the fastener 25 that takes off on the operating handle 3, thereby makes the energy of third elastic component obtain releasing in the twinkling of an eye, in order to reach the effect of rapid action.

As shown in fig. 4 and 5, the driving member 4 has an arc-shaped sliding slot 23 for connecting with the connecting rod 18, and the driving member 4 also has a through hole 24 for connecting with a release member 25. The release member 25 is rotatably connected to the through hole 24 of the driving member 4, the release member 25 is connected to a first elastic member, and the first elastic member has an elastic force for driving the hook 26 of the release member 25 to rotate toward the arc chute 23, so as to be connected to the connecting rod 18 through the hook 26. The release fastener 25 further has thereon: a trip shaft 27, in which a rotationally connected trip member 28 is provided, and when the driving member 4 is located at the trip position, the trip member 28 can be engaged with the trip shaft 27 by rotation, so that the trip member 25 overcomes the elastic force of the first elastic member to release the connection with the link 18; the first elastic member may be a torsion spring.

As shown in fig. 1 and 2, the housing has a test button 29, the test button 29 is engaged with the unlocking member 28, when the driving member 4 is located at the opening position, the test button 29 is pressed to operate the unlocking member 28, the unlocking member 28 is engaged with the unlocking shaft 27 to rotate the unlocking member 25, the unlocking member 25 overcomes the elastic force of the first elastic member to release the hook on the connecting rod 18, and when the driving member 4 is rotated toward the closing position, the connecting rod 18 slides downward along the arc chute 23 of the driving member 4, so that the driving member 4 cannot drive the connecting rod 18 to close, thereby protecting the connecting rod from being closed by mistake.

As shown in fig. 2, a second elastic member 30 is connected between the moving contact holder 13 and the housing, and the second elastic member 30 has an elastic force that pulls the moving contact holder 13 downward to separate the moving contact 6 and the fixed contact 5. Specifically, the second elastic element 30 may be disposed on the back of the moving contact frame 13, one end of the second elastic element 30 is connected to a rotating shaft rotatably connected to the moving contact frame 13 and the connecting rod 18, and the other end of the second elastic element 30 is connected to the housing. When the movable contact frame 13 moves downward under the action of the second elastic element 30, the connecting rod 18 is driven to move downward, that is, after the release element 25 releases the hook on the connecting rod 18, the movable contact frame 13 drives the connecting rod 18 to move downward under the action of the second elastic element 30, so that the movable contact 6 and the static contact 5 are disconnected and cannot be closed.

As shown in fig. 3 and 6, the housing is provided with: the first limiting component 7 and the second limiting component 8 are respectively movably connected in the shell; when the driving piece 4 is located at a brake opening position, the first limiting assembly 7 locks the driving piece 4, and when the driving piece 4 is located at a brake closing position, the second limiting assembly 8 locks the driving piece 4; the first stop block 7 comprises: one end of the first locking piece 12 is rotatably connected to the driving piece 4, and the other end of the first locking piece 12 is slidably arranged in the shell; the first locking member 12 has a yielding pin 22 thereon, and the yielding pin 22 may be of a cylindrical configuration. The first locking member 12 is provided with a limiting shaft 14, a horizontal sliding groove 15 for accommodating the limiting shaft 14 is formed in the housing, and when the first locking member 12 is driven by the driving member 4 to move, the limiting shaft 14 slides in the housing, so that the first locking member 12 can be driven to reach a dead point position for locking the driving member 4.

As shown in fig. 7, the operating handle 3 has a swivel 9 fitted around the rotating shaft, and the swivel 9 has: a first fastening releasing piece 10 and a second fastening releasing piece 11 are protruded outwards in the radial direction, an inclined plane or an arc-shaped surface used for shifting the first limiting component 7 is arranged on the first fastening releasing piece 10, and an inclined plane or an arc-shaped surface used for shifting the second limiting component 8 is arranged on the second fastening releasing piece 11; when the operating handle 3 is switched off, the operating handle 3 rotates, and the first tripping piece 10 is firstly contacted with the first limiting component 7, so that the first limiting component 7 releases the limit of the driving piece 4; when the operating handle 3 is switched on, the operating handle 3 rotates, and first, the second fastening component 11 contacts the second limiting component 8, so that the second limiting component 8 releases the locking of the driving component 4.

As shown in fig. 8, the second limiting member 8 includes: the second locking piece 16 is rotatably connected in the shell, a clamping table 17 matched with the driving piece 4 is arranged on the second locking piece 16, a second yielding surface 31 matched with the second unfastening piece 11 is also arranged on the second locking piece 16, and the second yielding surface 31 is an inclined surface or an arc-shaped surface.

As shown in fig. 9 and 10, a transmission member 32 is rotatably disposed in the housing, the transmission member 32 has a first end 33 engaged with the second locking member 16 and a second end 34 engaged with a bimetal 35, the bimetal 35 is connected to the stationary contact 5, when the current on the stationary contact 5 is overloaded, the bimetal 35 is heated and deformed to drive the transmission member 32 to rotate, so that the second locking member 16 unlocks the driving member 4, and the driving member 4 rotates toward the opening position; through two gold 35's setting, when the electric switch was long-time when passing through great electric current, two gold 35 will generate heat and produce the deformation to cut off electric switch guarantees circuit stability.

As shown in fig. 9 and 11, a link member 36 and an electromagnetic mechanism cooperating with the link member 36 are rotatably disposed in the housing, one end of the link member 36 cooperates with the second end 34 of the transmission member 32, the link member 36 further has a third end 37 facing the electromagnetic mechanism, and the electromagnetic mechanism includes: the iron block 39 and the turning plate 38 are fixedly arranged, the turning plate 38 is arranged at intervals with the iron block 39, and the turning plate 38 is movably arranged in the shell; when the current of the electric switch is short-circuited, a large short-circuit current is generated, the short-circuit current enables an electromagnetic field to be generated between the turning plate 38 and the iron block 39, the turning plate 38 and the iron block 39 are attracted, the turning plate 38 is turned towards the third end 37 of the linkage piece 36, the linkage piece 36 is driven to be matched with the transmission piece 32, and the transmission piece 32 enables the second locking piece 16 to unlock the driving piece 4, so that the driving piece 4 rotates towards the opening position. Specifically, the iron blocks 39 are arranged on the opposite surfaces of the turning plate 38 at intervals, the iron blocks 39 are influenced by electromagnetism generated by current passing through the electric switch, when the current passing through the electric switch exceeds the limit, the electromagnetism generated by the current can enable the iron blocks 39 to generate magnetism, so that the turning plate 38 is attracted to approach towards the iron blocks 39, and the turning plate 38 drives the linkage piece 36 to move in the process of moving towards the iron blocks 39; through the arrangement of the linkage 36 and the electromagnetic mechanism, when the current passing through the electric switch instantaneously is overloaded, the electromagnetic mechanism rapidly reacts and can instantaneously cut off the electric switch so as to ensure the safety of the circuit.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the utility model may be made without departing from the scope of the utility model.

Claims

1. A dual break contact electrical switch comprising: the double-breakpoint contact device comprises a shell, a first connecting rod, a second connecting rod and a first connecting rod, wherein an operating mechanism and a double-breakpoint contact mechanism are arranged in the shell;

the double-breakpoint contact mechanism comprises two fixed contacts (5) and two moving contacts (6), the two moving contacts (6) are connected to a moving contact frame (13), and the moving contact frame (13) is arranged in the shell in a vertically sliding mode;

the operating mechanism includes: the double-breakpoint contact mechanism comprises an operating handle (3) and a driving piece (4) connected with the operating handle (3), wherein the driving piece (4) is connected with a movable contact frame (13) of the double-breakpoint contact mechanism through a connecting rod (18), the driving piece (4) is connected with a kick structure, and the kick structure has elastic force for enabling the driving piece (4) to perform quick action when the driving piece (4) moves from a switch-on position to a switch-off position or from the switch-off position to the switch-on position.

2. The double break point contact electrical switch of claim 1, wherein the housing comprises an upper housing (1) and a lower housing (2), the operating mechanism being disposed within the upper housing (1), the upper housing (1) being removably connected to the lower housing (2).

3. The double-breakpoint contact electric switch according to claim 1, wherein a plurality of arc striking plates (19) are arranged in the arc extinguishing chamber at intervals along the height direction, the arc striking plates (19) comprise an upper arc striking plate and a lower arc striking plate, and the upper arc striking plate is in equipotential electrical connection with the static contact (5).

4. A double break point contact electric switch according to claim 3, characterized in that a supporting structure (20) is provided in the housing for cooperating with the moving contact frame (13), when the moving contact frame (13) moves down to the opening position, the supporting structure (20) is supported at the bottom end of the moving contact frame (13), and the supporting structure (20) is in equipotential electric connection with the lower lead piece.

5. Double break contact electrical switch according to claim 1, characterized in that the housing has at least one exhaust opening (21) on each side of its lower end communicating with the arc extinguishing chamber.

6. The double break point contact electric switch according to claim 1, characterized in that the driving member (4) of the operating mechanism has an arc-shaped sliding slot (23) for connecting the connecting rod (18), the driving member (4) is also rotatably connected with a release member (25), the release member (25) has a hook (26), and the driving member (4) is connected with the connecting rod (18) through the hook (26) of the release member (25).

7. The double break point contact electric switch according to claim 6, characterized in that a first elastic member is connected to the trip member (25), and the first elastic member has an elastic force for driving the hook (26) of the trip member (25) to rotate toward the arc chute (23);

the release member (25) further comprises: trip shaft (27), have unlocking piece (28) of rotating the connection in the casing, work as driving piece (4) are located when separating the floodgate position, unlocking piece (28) through rotate can with trip shaft (27) cooperation, so that trip spare (25) overcome the elastic force of first elastic component, it is right to remove the connection of connecting rod (18).

8. A double break contact electric switch according to claim 7, characterized in that a second elastic member (30) is connected between the moving contact frame (13) and the housing, the second elastic member (30) having an elastic force pulling the moving contact frame (13) downward to break the moving contact (6) and the stationary contact (5).

9. The double break contact electrical switch of any of claims 1-8, wherein disposed within the housing are: the first limiting assembly (7) and the second limiting assembly (8) are movably connected in the shell respectively; when the driving piece (4) is located at a brake opening position, the first limiting assembly (7) locks the driving piece (4), and when the driving piece (4) is located at a brake closing position, the second limiting assembly (8) locks the driving piece (4);

operating handle (3) have the cover establish in the epaxial rotation (9) of pivot, have on rotation (9): a first release part (10) and a second release part (11) protrude outwards in the radial direction, an inclined plane or an arc-shaped surface used for shifting the first limiting assembly (7) is arranged on the first release part (10), and an inclined plane or an arc-shaped surface used for shifting the second limiting assembly (8) is arranged on the second release part (11);

the second stop assembly (8) comprises: second locking piece (16), second locking piece (16) rotate to be connected in the casing, have on second locking piece (16) be used for with driving piece (4) complex ka tai (17), still have on second locking piece (16) be used for with second lets off fastener (11) complex second and lets off face (31), second lets off face (31) be inclined plane or arcwall face.

10. The double-breakpoint contact electric switch according to claim 9, wherein a transmission member (32) is rotatably disposed in the housing, the transmission member (32) has a first end (33) engaged with the second locking member (16) and a second end (34) engaged with a bimetallic strip (35), the bimetallic strip (35) is connected to the stationary contact (5), and when a current on the stationary contact (5) is overloaded, the bimetallic strip (35) is deformed due to heat to drive the transmission member (32) to rotate, so that the second locking member (16) unlocks the driving member (4) and the driving member (4) rotates toward the opening position.

11. A double break point contact electrical switch according to claim 10, wherein a link member (36) and an electromagnetic mechanism cooperating with the link member (36) are rotatably disposed in the housing, one end of the link member (36) cooperating with the second end (34) of the transmission member (32), the link member (36) further having a third end (37) facing the electromagnetic mechanism, the electromagnetic mechanism comprising: the iron block (39) is fixedly arranged, the turning plate (38) is arranged at intervals with the iron block (39), and the turning plate (38) is movably arranged in the shell;

when the current of the electric switch is short-circuited, an electromagnetic field is generated between the turning plate (38) and the iron block (39), the turning plate (38) and the iron block (39) are attracted, the turning plate (38) turns towards the third end (37) of the linkage piece (36) so as to drive the linkage piece (36) to be matched with the transmission piece (32), and the transmission piece (32) enables the second locking piece (16) to unlock the driving piece (4) so as to enable the driving piece (4) to rotate towards the opening position.