breaker

Abstract

The invention relates to a circuit breaker. The circuit breaker comprises a moving contact, a static contact, an operating mechanism, an arc extinguishing system and a release. The arc extinguishing system is arranged on one side of a connection portion of the moving contact and the static contact. The moving contact is connected to the operating mechanism in a linkage mode. The operating mechanism is connected to the release through a draw bar in the linkage mode. The static contact comprises a static contact point bearing portion, a wiring portion used for introducing a current and a bending portion used for connecting the static contact point bearing portion and the wiring portion. An upper side surface of the static contact point bearing portion is provided with a static contact point. The moving contact comprises a moving contact seat, a moving contact sheet, a moving contact point and a moving contact shell. The moving contact seat is installed in the moving contact shell. A tail end of the moving contact sheet is hinged to the moving contact seat. The moving contact point is arranged on a top end of the moving contact sheet. The moving contact shell forms an opening above the connection portion of the moving contact sheet and the moving contact seat. When a heavy current passes through, the moving contact is bounced and disconnected because of a Lorentz force so that a segmentation capability of the circuit breaker is increased.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a plastic case circuit breaker. Background technique [0002] The limit breaking current is an important performance index of the plastic case circuit breaker. When the circuit breaker passes a current larger than the limit breaking current, the moving contact and the static contact will heat up rapidly. When there is no time to break, the surface of the moving contact and the static contact will melt and stick together, resulting in the failure of the circuit breaker to break normally, resulting in damage to the circuit or electrical appliances, which cannot play the original protective role, and has certain safety hazards. Contents of the invention [0003] In order to overcome the above defects, the present invention provides a circuit breaker with forced breaking capacity, the dynamic and static contacts are not easy to be welded, and the ultimate breaking capacity is high. [0004] In...

AI Technical Summary

Problems solved by technology

[0002] The limit breaking current is an important performance index of the plastic case circuit breaker. When the circuit breaker passes a current larger than the limit breaking current, the moving contact and the static contact will heat up rapidly. When there is no time to break, the surface of the moving contact and the static contact will melt and stick together, causing the circuit breaker to fail to break normally, resulting in damage to the circuit or electrical appliances, which cannot play the original protective role, and has certain safety hazards

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