Arc isolation cover of circuit breaker

Abstract

An arc isolation cover of a circuit breaker belongs to the technical field of low-voltage electric appliances. The circuit breaker comprises a circuit breaker body. The circuit breaker body is provided with a circuit breaker arc extinguish chamber, and the circuit breaker arc extinguish chamber is provided with a circuit breaker arc extinguish chamber air outlet. The arc isolation cover comprisesan outer arc isolation cover, and the outer arc isolation cover is provided with an outer arc isolation cover cavity. The arc isolation cover is characterized by further comprising an inner arc isolation cover, the inner arc isolation cover is arranged in the outer arc isolation cover cavity, an insulation isolation board is arranged on the inner arc isolation cover, the outer arc isolation covercavity is divided into a deionization cavity positioned above the insulation isolation board and an external bus bar cavity positioned below the insulation isolation board in the height direction by the insulation isolation board, the deionization cavity is right opposite to an air outlet of the circuit breaker arc extinguish chamber and accommodates high-temperature electric arcs sprayed out fromthe air outlet of the circuit breaker arc extinguish chamber when the circuit breaker body is disconnected, and an external connecting cable penetrates through the external bus bar cavity. The influence by the electric arcs sprayed out of the arc extinguishing chamber is prevented, interphase breakdown is avoided, the structure is simple, assembling is convenient, and economy and cheapness are realized.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to an arc shield of a circuit breaker. Background technique [0002] As known in the industry, the function of a low-voltage circuit breaker is to break or cut off the fault current. Specifically, when the moving contact of the contact system of the low-voltage circuit breaker is separated from the static contact, the fault current is broken. Furthermore, as known in the industry, when the moving contact is separated from the static contact to break the fault current, an arc will be generated in the arc extinguishing chamber and the arc will be sprayed outward from the gas outlet of the arc extinguishing chamber, because the outwardly sprayed arc will cause Problems such as phase-to-phase breakdown and ablated parts, therefore, an arc hood is usually installed outside the circuit breaker to alleviate or even avoid the aforementioned problems. A...

AI Technical Summary

Problems solved by technology

Although the arc shield made of insulating material can play a good role in eliminating ionization and improving the insulation level of the circuit breaker, but whether the structure of the arc shield is reasonable or not has a great influence on the insulation protection level of the circuit breaker and the difficulty of installation. Ease of use, etc. will have a corresponding impact

[0003] The existing technology pays more attention to the insulation between phases when the circuit breaker is equipped with an arc shield, but often neglects to pay attention to the pollution of the circuit breaker terminal and external busbar caused by the arc ejected from the arc extinguishing chamber. Significantly reduce the influence of insulation and even have risks such as interphase breakdown. The external busbars or external cables required for wiring) are in the same space where the two are not isolated

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