Static contact and circuit breaker with the same

Abstract

The invention discloses a static contact and a circuit breaker with the static contact. The static contact of the present invention is used in a circuit breaker that uses magnetic blowing to extinguish the arc, and it includes a static contact and an integrally formed body portion, the body portion includes a static contact bearing portion for carrying the static contact, and a static contact for carrying the static contact. The wiring part for introducing current, and the bending part used to connect the static contact bearing part and the wiring part, the static contact bearing part has a first end connected with the bending part and an opposite second end, and the static contact is located at the Between the first end and the second end of the static contact bearing part, wherein the static contact bearing part has a narrowed section near the static contact in its extending direction. When the current passes through the narrowed section, the current density near the contact increases, which increases the magnetic blowing force near the contact, so that the arc can be blown away with a greater magnetic blowing force, so that the arc burns on the static contact The time will be shortened, the static contacts will be protected and the service life will be increased.

Description

technical field [0001] The invention relates to a static contact, which is used in a circuit breaker which uses magnetic blowing to extinguish arcs, and also relates to a circuit breaker with the static contact. Background technique [0002] Plastic Case Circuit Breaker (MCCB) is a circuit breaker that uses magnetic blowing to extinguish the arc. It is widely used in power distribution systems. The degree of damage to electrical equipment and the switch itself is reduced. Plastic case circuit breakers generally include a plastic case, a contact system, an arc extinguishing system, an operating mechanism and a release. When the short-circuit current occurs, the release device of the circuit breaker will trip instantaneously to make the operating mechanism act, and the moving contact and the static contact will be separated under the drive of the operating mechanism and the action of electric repulsion. When the moving contact is separated from the static contact, an arc wil...

AI Technical Summary

Problems solved by technology

In this conventional static contact 1, the width of the static contact carrying portion 4 along its extending direction is substantially the same, so the magnetic blowing force cannot be enhanced, and the static contact 2 cannot be well protected

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