CN213816013U - Current-limiting molded case circuit breaker - Google Patents
Current-limiting molded case circuit breaker Download PDFInfo
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- CN213816013U CN213816013U CN202023161930.5U CN202023161930U CN213816013U CN 213816013 U CN213816013 U CN 213816013U CN 202023161930 U CN202023161930 U CN 202023161930U CN 213816013 U CN213816013 U CN 213816013U
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- current
- circuit breaker
- shell
- wiring board
- conducting plate
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Abstract
The utility model relates to a current-limiting molded case circuit breaker, which comprises a circuit breaker body, wherein a current-limiting device is arranged on an inlet wire wiring board of the circuit breaker body, the current-limiting device comprises a shell and a plurality of groups of current-limiting components, each current-limiting component comprises a bracket, a current-conducting plate, a wiring board, two moving contacts which are arranged in the shell, an arc extinguish chamber which is arranged in the shell corresponding to the two moving contacts, a copper braided belt which is arranged between the two moving contacts, and a contact spring which is arranged between the bracket and the two moving contacts, one end of the conducting plate is provided with a first fixed contact communicated with one of the moving contacts, the other end of the conducting plate extends out of the shell and is connected with an inlet wire wiring board of the breaker body, one end of the wiring board is provided with a second fixed contact communicated with the other moving contact, and the other end of the wiring board is provided with a wiring terminal exposed outside the shell. The utility model has the advantages of simple structure, stable and reliable performance and high safety.
Description
Technical Field
The utility model relates to a circuit breaker technical field, concretely relates to current-limiting moulded case circuit breaker.
Background
The molded case circuit breaker is widely applied to the departments of industry and agriculture, traffic, mines, civil buildings, national defense and the like, plays a great role in the transmission and distribution of electric power and the protection of motors, and is a product with large use amount and wide use range in low-voltage electric appliances. A molded case circuit breaker is a switching device capable of closing, carrying, and opening a current under a normal circuit condition, and closing, carrying, and opening a current under an abnormal circuit condition (including a short-circuit condition) within a prescribed time. The molded case circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power supply circuit, the motor and the like, and automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur. The current moulded case circuit breaker's structural design is unreasonable, and this circuit breaker's current-limiting capacity is relatively weak, when having super large current in the circuit, this circuit breaker's contact burns out easily, and product life is short, causes the incident even to this moulded case circuit breaker has the defect that the performance is unreliable, the security is low.
Disclosure of Invention
An object of the utility model is to overcome prior art's defect, provide a current-limiting moulded case circuit breaker of simple structure, stable performance are reliable, high security.
In order to achieve the above purpose, the utility model adopts a current-limiting molded case circuit breaker, which comprises a circuit breaker body, wherein a current-limiting device is arranged on an inlet wire wiring board of the circuit breaker body, the current-limiting device comprises a shell connected with a shell of the circuit breaker body and a plurality of groups of current-limiting assemblies respectively arranged in the shell, the current-limiting assemblies comprise a bracket arranged in the shell, a current-conducting plate arranged on the bracket, a wiring board arranged at one side of the current-conducting plate, two moving contacts rotatably arranged on the bracket, an arc-extinguishing chamber arranged in the shell corresponding to the two moving contacts, a copper braid arranged between the two moving contacts, and a contact spring arranged between the bracket and the two moving contacts, a first stationary contact communicated with one of the moving contacts is arranged at one end of the current-conducting plate, the other end of the current-conducting plate extends out of the shell and is connected with the inlet wire wiring board of the circuit breaker body, one end of the wiring board is provided with a second fixed contact communicated with the other moving contact, and the other end of the wiring board is provided with a wiring terminal exposed outside the shell.
The beneficial effect of above-mentioned structure does: be provided with current limiting device on the circuit breaker body, current limiting device can play the effect of protection circuit breaker body, at the during operation, the power is inserted from the wiring board, wiring board and current conducting plate are put through two moving contacts, the current conducting plate is put through with the inlet wire terminal board of circuit breaker body, when the circuit has super large current, current limiting device's moving contact is pushed open by electric repulsion, the disconnection of moving contact and static contact, the power of circuit breaker body is cut off, thereby play the effect of protection circuit breaker body, be favorable to prolonging the life-span of circuit breaker, thereby this moulded case circuit breaker has simple structure, stable performance is reliable, high security, long service life's advantage.
Particularly, arc isolating pieces are respectively arranged on one sides of the two movable contacts corresponding to the movable contacts. The arc isolating piece can isolate the electric arc, and can avoid the electric arc from burning the moving contact, thereby being beneficial to prolonging the service life of the moving contact.
Particularly, the conducting plate is provided with an arc isolating sleeve corresponding to the first static contact, the arc isolating sleeve is wrapped on one end of the conducting plate, and the first static contact is exposed out of the arc isolating sleeve and can be in contact with one of the moving contacts. The arc isolating sleeve can isolate electric arcs, so that the first stationary contact is prevented from being burnt by the electric arcs, and the service life of the first stationary contact is prolonged.
Drawings
Fig. 1 is a perspective view of an embodiment of the present invention.
Fig. 2 is a cross-sectional view of an embodiment of the present invention.
Fig. 3 is an exploded view of a current limiting device according to an embodiment of the present invention.
Fig. 4 is an assembly view of the moving contact, the conductive plate and the wiring board according to the embodiment of the present invention.
Detailed Description
As shown in fig. 1, 2, 3, and 4, an embodiment of the present invention is a current-limiting molded case circuit breaker, including a circuit breaker body 30, a current-limiting device 10 is disposed on an incoming line terminal block 31 of the circuit breaker body 30, the current-limiting device 10 includes a housing 11 connected to a housing 31 of the circuit breaker body 30, and a plurality of sets of current-limiting assemblies 20 respectively disposed in the housing 11, the current-limiting assemblies 20 include a support 21 disposed in the housing 11, a conductive plate 22 disposed on the support 21, a terminal block 23 disposed on one side of the conductive plate 22, two movable contacts 24 rotatably disposed on the support 21, an arc extinguish chamber 26 disposed in the housing 11 corresponding to the two movable contacts 24, a copper braid 25 disposed between the two movable contacts 24, and a contact spring disposed between the support 21 and the two movable contacts 24, one end of the conductive plate 22 is provided with a first stationary contact 221 connected to one of the movable contacts 24, the other end of the conductive plate 22 extends outside the housing 11 and is connected to an incoming line terminal block 32 of the circuit breaker body 30, one end of the terminal block 23 is provided with a second stationary contact 231 communicated with the other movable contact 24, and the other end of the terminal block 23 is provided with a terminal 232 exposed outside the housing 11. Arc isolating pieces 242 are respectively arranged on one sides of the two movable contacts 24 corresponding to the movable contact 241. The arc isolating piece can isolate the electric arc, and can avoid the electric arc from burning the moving contact, thereby being beneficial to prolonging the service life of the moving contact. The conducting plate 22 is provided with an arc isolating sleeve 222 corresponding to the first stationary contact 221, the arc isolating sleeve 222 is wrapped on one end of the conducting plate 22, and the first stationary contact 221 is exposed out of the arc isolating sleeve 222 and can be in contact with one of the movable contacts 24. The arc isolating sleeve can isolate electric arcs, so that the first stationary contact is prevented from being burnt by the electric arcs, and the service life of the first stationary contact is prolonged.
Be provided with current limiting device on the circuit breaker body, current limiting device can play the effect of protection circuit breaker body, at the during operation, the power is inserted from the wiring board, wiring board and current conducting plate are put through two moving contacts, the current conducting plate is put through with the inlet wire terminal board of circuit breaker body, when the circuit has super large current, current limiting device's moving contact is pushed open by electric repulsion, the disconnection of moving contact and static contact, the power of circuit breaker body is cut off, thereby play the effect of protection circuit breaker body, be favorable to prolonging the life-span of circuit breaker, thereby this moulded case circuit breaker has simple structure, stable performance is reliable, high security, long service life's advantage.
Claims (3)
1. The utility model provides a current-limiting moulded case circuit breaker, includes the circuit breaker body, its characterized in that: the incoming line wiring board of the circuit breaker body is provided with a current limiting device, the current limiting device comprises a shell connected with a shell of the circuit breaker body and a plurality of groups of current limiting assemblies respectively arranged in the shell, each current limiting assembly comprises a bracket arranged in the shell, a current conducting plate arranged on the bracket, a wiring board arranged on one side of the current conducting plate, two moving contacts rotatably arranged on the bracket, an arc extinguish chamber arranged in the shell corresponding to the two moving contacts, a copper braided belt arranged between the two moving contacts and a contact spring arranged between the bracket and the two moving contacts, one end of the current conducting plate is provided with a first static contact communicated with one of the moving contacts, the other end of the current conducting plate extends out of the shell and is connected with the incoming line wiring board of the circuit breaker body, one end of the wiring board is provided with a second static contact communicated with the other moving contact, and the other end of the wiring board is provided with a wiring terminal exposed outside the shell.
2. The current-limiting molded case circuit breaker according to claim 1, wherein: and arc isolating pieces are respectively arranged at one side of the two movable contacts corresponding to the movable contacts.
3. The current-limiting molded case circuit breaker according to claim 1 or 2, wherein: the conducting plate is provided with an arc isolating sleeve corresponding to the first static contact, the arc isolating sleeve is wrapped on one end of the conducting plate, and the first static contact is exposed out of the arc isolating sleeve and can be contacted with one of the moving contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023161930.5U CN213816013U (en) | 2020-12-24 | 2020-12-24 | Current-limiting molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023161930.5U CN213816013U (en) | 2020-12-24 | 2020-12-24 | Current-limiting molded case circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213816013U true CN213816013U (en) | 2021-07-27 |
Family
ID=76948047
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202023161930.5U Active CN213816013U (en) | 2020-12-24 | 2020-12-24 | Current-limiting molded case circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213816013U (en) |
-
2020
- 2020-12-24 CN CN202023161930.5U patent/CN213816013U/en active Active
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| GR01 | Patent grant |