Contact assembly of miniature circuit breaker

Abstract

The utility model discloses a miniature circuit breaker contact assembly, which comprises a static contact and a moving contact, and is characterized in that the moving contact is provided with a first hinge hole, hemispherical conductive parts are arranged on the moving contact, the static contact is provided with a second hinge hole, the static contact is provided with an arc-shaped groove for the hemispherical conductive parts to be clamped in, and the arc-shaped groove is communicated with the first hinge hole and the second hinge hole. The hemispherical conductive part can be attached to the inner side wall of the arc-shaped groove, and an elastic conductive piece is arranged between the static contact and the magnet yoke. The contact assembly is simple in structure and reasonable in design, can effectively increase the contact area between the moving contact and the static contact, avoids local overheating, can reduce the voltage of the contact end when the contacts are broken, reduces the possibility that the contacts are burnt out, improves the working stability of the contact assembly, and prolongs the service life of the contact assembly.

Description

Technical Field

[0001] This utility model relates to circuit breaker accessories, specifically to a miniature circuit breaker contact assembly. Background Technology

[0002] A miniature circuit breaker (MCB) is a specialized device used for safe circuit detection and disconnection. The contact assembly is a crucial component of a MCB, typically consisting of a moving contact and a stationary contact. The moving contact is hinged inside the circuit breaker and connected to a latching assembly, while the stationary contact is fixed inside the circuit breaker and connected to a magnetic yoke. A drawback of this type of contact assembly is that when the moving contact swings to contact the stationary contact, the contact is usually point or line contact. Assembly errors and contact wear during use can lead to poor contact, causing localized overheating and burnout. Furthermore, this contact method can result in excessively high disconnection voltage during disconnection, easily causing contact burnout. Utility Model Content

[0003] In view of the deficiencies in the prior art, the technical problem to be solved by this utility model is to provide a miniature circuit breaker contact assembly for solving the above-mentioned problems.

[0004] Therefore, this utility model is implemented using the following solution:

[0005] A miniature circuit breaker contact assembly includes a stationary contact and a moving contact, characterized in that: a first hinge hole is provided on the moving contact, and hemispherical conductive parts are arranged on the moving contact; a second hinge hole is provided on the stationary contact, and an arc-shaped groove is provided on the stationary contact for the hemispherical conductive parts to be inserted into, the hemispherical conductive parts being able to fit against the inner sidewall of the arc-shaped groove; and an elastic conductive element is provided between the stationary contact and the magnetic yoke.

[0006] The elastic conductive element is made of PEDOT material.

[0007] The stationary contact head is integrally provided with a contact portion, which is block-shaped, and the arc-shaped groove is provided on the contact portion.

[0008] The stationary contact is bent into a connecting section and a connecting section. The elastic conductive element is disposed between the connecting section and the magnetic yoke. The contact portion is located on the front side of the connecting section. The rear side of the connecting section has a hinge portion. The second hinge hole is disposed on the hinge portion. The contact portion is disposed lower than the hinge portion.

[0009] The bottom of the moving contact is integrally formed with a contact plate, and the hemispherical conductive part is disposed on the contact plate.

[0010] The aforementioned technical solution provides a miniature circuit breaker contact assembly. By changing the stationary contact to a movable one, when the moving contact presses against the stationary contact, a hemispherical conductive part on the moving contact contacts an arc-shaped groove on the stationary contact to achieve conductivity. This enables surface contact conductivity between the moving and stationary contacts, replacing traditional point or line contact methods. This effectively increases the conductive contact area and avoids localized overheating due to poor contact. Furthermore, since multiple hemispherical conductive parts are used, they can achieve voltage division, reducing the voltage when the moving and stationary contacts break, lowering the possibility of contact burnout, and thus improving the stability and service life of the contact assembly. Attached Figure Description

[0011] The present invention includes the following figures:

[0012] Figure 1 This is a structural diagram of the stationary contact and magnetic yoke of this utility model;

[0013] Figure 2 This is a structural diagram of the moving contact of this utility model. Detailed Implementation

[0014] As shown in the figure, this utility model discloses a miniature circuit breaker contact assembly, including a stationary contact and a moving contact 9. The moving contact 9 has a first hinge hole 12 and hemispherical conductive parts 11 arranged on it. The stationary contact has a second hinge hole 8 and an arc-shaped groove 6 for the hemispherical conductive parts 11 to fit into. The hemispherical conductive parts 11 can fit against the inner wall of the arc-shaped groove 6. An elastic conductive element 2 is provided between the stationary contact and the magnetic yoke 1. In this embodiment, the elastic conductive element 2 is made of PEDOT material, which has good conductivity and a certain degree of elasticity. The elastic conductive element 2 can be connected to the stationary contact and the magnetic yoke by conductive adhesive, or by more advanced methods such as laser welding. Furthermore, a contact portion 5 is integrally provided on the stationary contact. The contact portion 5 is block-shaped, and the arc-shaped groove 6 is provided on the contact portion 5. The stationary contact is bent into a connecting section 3 and a connecting section 4. An elastic conductive element 2 is disposed between the connecting section 3 and the magnetic yoke 1. The contact portion 5 is located on the front side of the connecting section 4. The rear side of the connecting section 4 has a hinge portion 7. A second hinge hole 8 is disposed on the hinge portion 7. The contact portion 5 is disposed lower than the hinge portion 7. The bottom of the moving contact 9 is integrally formed with a contact plate 10, and a hemispherical conductive portion 11 is disposed on the contact plate 10.

[0015] When this contact assembly is installed inside a circuit breaker, and the circuit breaker is moved to the closed position, the locking assembly will cause the moving contact to approach the stationary contact. At this time, the hemispherical conductive part 11 on the moving contact 9 will be engaged in the arc-shaped groove 6 on the contact part 5, thereby achieving surface contact conductivity. Meanwhile, since an elastic conductive element 2 is provided between the stationary contact and the magnetic yoke 1, when the moving contact 9 squeezes the stationary contact, the stationary contact will adaptively swing slightly, thereby ensuring that the hemispherical conductive part 11 and the arc-shaped groove 6 can fit together and make contact, eliminating the effects of assembly errors and contact wear.

[0016] This invention, by changing the stationary contact to a movable one, allows the moving contact to press against the stationary contact. A hemispherical conductive part on the moving contact contacts the arc-shaped groove on the stationary contact, achieving electrical conductivity. This surface contact conductivity between the moving and stationary contacts replaces traditional point or line contact methods, effectively increasing the conductive contact area and preventing localized overheating due to poor contact. Furthermore, the multiple hemispherical conductive parts enable voltage division, reducing the voltage at which the moving and stationary contacts break, lowering the likelihood of contact burnout, and thus improving the stability and lifespan of the contact assembly.

Claims

1. A miniature circuit breaker contact assembly, comprising a stationary contact and a moving contact (9), characterized in that: The moving contact (9) is provided with a first hinge hole (12), and a hemispherical conductive part (11) is arranged on the moving contact (9). The stationary contact is provided with a second hinge hole (8), and the stationary contact has an arc groove (6) for the hemispherical conductive part (11) to be inserted into. The hemispherical conductive part (11) can fit against the inner wall of the arc groove (6). An elastic conductive element (2) is provided between the stationary contact and the magnetic yoke (1).

2. The miniature circuit breaker contact assembly according to claim 1, characterized in that: The elastic conductive element (2) is made of PEDOT material.

3. The miniature circuit breaker contact assembly according to claim 1, characterized in that: The stationary contact head is integrally provided with a contact portion (5), the contact portion (5) is block-shaped, and the arc-shaped groove (6) is provided on the contact portion (5).

4. A miniature circuit breaker contact assembly according to claim 3, characterized in that: The stationary contact is bent into a connecting section (3) and a connecting section (4). The elastic conductive element (2) is disposed between the connecting section (3) and the magnetic yoke (1). The contact part (5) is located on the front side of the connecting section (4). The rear side of the connecting section (4) has a hinge part (7). The second hinge hole (8) is disposed on the hinge part (7). The contact part (5) is disposed lower than the hinge part (7).

5. A miniature circuit breaker contact assembly according to claim 1, characterized in that: The bottom of the moving contact (9) is integrally formed with a contact plate (10), and the hemispherical conductive part (11) is disposed on the contact plate (10).

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