Miniature circuit breaker with variedly placed arc-extinguishing grid pieces

A technology for small circuit breakers and arc extinguishing grids, which is applied to circuit breaker components, circuits, electrical components, etc., can solve problems such as single structure and inconvenient processing, and achieve mutual interference, arc extinguishing system optimization, and arc extinguishing The effect of system simplification

CN107293459AInactive Publication Date: 2017-10-24ZHEJIANG CHINT ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-10-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a miniature circuit breaker with variedly placed arc-extinguishing grid pieces. The miniature circuit breaker comprises a housing with air outlets; a grid piece fixation structure for fixing arc-extinguishing grid pieces is arranged at the housing; the arc-extinguishing grid pieces and the housing are in direct and static connection by the grid piece fixation structure to form gaps communicated with the air outlets between the adjacent arc-extinguishing grid pieces. On the basis of the structure for fixing the arc-extinguishing grid pieces at the housing of the circuit breaker, the arc-extinguishing grid pieces with different numbers are selected to be installed in fixed ribs of the housing of the circuit breaker based on different current specifications.
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Description

technical field

[0001] The invention belongs to the field of low-voltage electrical appliances, in particular to a small circuit breaker with arc extinguishing grids, in particular to a small circuit breaker with multiple placed arc extinguishing grids. Background technique

[0002] The arc extinguishing system of a small circuit breaker usually includes an arc extinguishing chamber composed of arc extinguishing grids, an arc running channel and an arc blowing device that leads the arc to the arc extinguishing chamber, especially the conventionally used AC 50Hz, rated current up to 63A, rated For small circuit breakers with a voltage not exceeding 400V, the arc extinguishing capacity of the arc extinguishing system is related to the breaking capacity of the circuit breaker, and the arc extinguishing capacity involves many factors. In the existing small circuit breaker, multiple arc extinguishing grids are first made into an arc extinguishing chamber with an integrated struct...

Examples

Embodiment Construction

[0027] combine figure 1 The three-dimensional schematic diagram of the overall internal structure of the miniature circuit breaker and Figure 6 It can be seen from the perspective schematic diagram of the case cover 6 that the miniature circuit breaker with multiple placed arc extinguishing grids of the present invention includes a housing composed of a base 1 and a case cover 6, and the base 1 and the case cover 6 can be made of any known One method (such as screw, clamping, etc.) to achieve static connection, a static contact 3 and a moving contact 4 are provided in the cavity formed between the base 1 and the cover 6, and the handle drives the moving contact through the operating mechanism 7 The head 4 swings to contact and separate from the static contact 3 to realize the on-off of the circuit.

[0028]Circuit breakers are products with different sizes and current specifications according to user needs, and have different requirements for arc extinguishing systems. A ben...