Miniature circuit breaker

Abstract

The invention discloses a miniature circuit breaker, which mainly solves the abnormal motion caused by the interference between the ejector rod and the movable contact, and can further improve the breaking capacity of the miniature circuit breaker. The miniature circuit breaker includes a yoke secured to a housing, the right end of the yoke is fixedly provided with an iron core, an insulating sleeve is fixed on the outside of the iron core, an excitation coil is wound around the outside of the insulating sleeve, one end of the excitation coil is electrically connected with an incoming wire terminal, the other end of the excitation coil is electrically connected with the static contact, the insulating sleeve is also provided with an armature which is limited to move, the inner side of the iron core is also sleeved with an ejector rod, the iron core and the ejector rod form a sliding fit, the armature is also connected with the ejector rod to move the ejector rod attached to the armaturein the direction of the iron core, the ejector rod is located on the left side of the handle operating mechanism, the ejector rod is separated from the handle operating mechanism by means of a spring, and when an external circuit is short-circuited, the armature overcomes the resistance of the spring and pushes the ejector rod until the ejector rod touches the handle operating mechanism and is tripped.

Description

technical field [0001] The invention belongs to the technical field of small circuit breakers, and in particular relates to an operation and release mechanism, an arc extinguishing or arc extinguishing device and a connecting terminal on the small circuit breaker. Background technique [0002] The Chinese invention patent with publication number CN205016480U and publication date of February 3, 2016 discloses a small circuit breaker, which includes a small circuit breaker housing composed of a base and an upper cover, and the two ends of the base are respectively provided with incoming wire terminal terminals The installation groove and the terminal installation groove of the outlet terminal are respectively installed in the installation groove of the terminal terminal of the incoming terminal and the terminal installation groove of the outgoing terminal, and the connecting terminal of the outgoing terminal is installed respectively, and there are also incoming wires at both e...

AI Technical Summary

Problems solved by technology

Because the ejector rod is installed on the moving contact, it is very easy to change

In addition, because the depressing tongue in the terminal is relatively thin, the reliability of the connection is poor, and at the same time, when the screw in the terminal is turned, the guide of the depressing tongue is poor

In addition, in the prior art, the shell located at the bottom of the arc extinguishing chamber is closed. When an arc is produced, the gas in the shell is heated and expanded due to the influence of the high-energy arc, which greatly hinders the gas discharge, resulting in poor arc ignition effect.

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