Static contact arc extinguishing module of circuit breaker

Abstract

The invention relates to a static contact arc extinguishing module of a circuit breaker. The static contact arc extinguishing module of the circuit breaker comprises a static contact and an arc extinguishing assembly arranged on the static contact, the arc extinguishing assembly comprises a housing with an arc extinguishing cavity, a plurality of arc extinguishing grid pieces arranged in the housing and an arc isolating piece, one side of the housing is provided with a through hole matched with the motion trail of a moving contact, the partition protection plate is arranged in the through hole, arc discharge holes are formed in the positions, corresponding to the upper ends of the arc extinguishing grid pieces, of the cover shell, a U-shaped contact part penetrating through the arc extinguishing cavity is arranged at the position, corresponding to the lower ends of the arc extinguishing grid pieces, of one end of the static contact, a static contact is arranged on the U-shaped contact part, the other end of the static contact is provided with a wiring part extending out of the housing, and a magnetic increasing sheet is arranged in the housing corresponding to the lower part of the static contact. The static contact arc extinguishing module has the advantages of being simple in structure, stable and reliable in performance, convenient to assemble and capable of effectively prolonging the service life of the circuit breaker and improving the breaking capacity of the circuit breaker.

Description

technical field [0001] The invention relates to the technical field of circuit breakers, in particular to a static contact arc extinguishing module of a circuit breaker. Background technique [0002] A circuit breaker refers to a switching device that can close, carry and break current under normal circuit conditions and can close, carry and break current under abnormal circuit conditions within a specified time. The circuit breaker has overload, short circuit and undervoltage protection functions, which can protect lines and power supply equipment from damage, and can also provide protection for fire hazards that may be caused by long-term ground faults that cannot be detected by overcurrent protection. The molded case circuit breaker includes a plastic case, an operating mechanism, a contact system, and an arc extinguishing system. The structural design of the arc extinguishing system of the existing molded case circuit breaker is unreasonable. The structural design of the...

AI Technical Summary

Problems solved by technology

The molded case circuit breaker includes a plastic case, an operating mechanism, a contact system, and an arc extinguishing system. The structural design of the arc extinguishing system of the existing molded case circuit breaker is unreasonable. The structural design of the arc extinguishing system cannot be integrated and modularized, and the assembly is not enough Convenient, and the arc extinguishing system cannot elongate the arc to achieve rapid cooling of the arc, resulting in unsatisfactory arc extinguishing effect, and the contacts are easily burned, so the breaking capacity of the circuit breaker is low

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