Magnetic releaser of circuit breaker

Abstract

The invention relates to a magnetic releaser of a circuit breaker, belonging to the technical field of a low-voltage apparatus. The magnetic releaser comprises a shell, an armature, a yoke and an adjustment device which consists of an adjustment bracket, a torsion spring and an adjustment screw; the armature is hinged on the shell; the yoke is fixed with the shell; the adjustment screw is spirally matched on the shell and corresponds to an action part of the adjustment bracket; a pivot of the adjustment bracket is arranged on the shell; one end of the action part of the adjustment bracket in a length direction extends to form a torsion spring base; a torsion spring containing cavity is arranged on the torsion spring base and faces to one side of the torsion spring; the torsion spring is contained in the torsion spring containing cavity; a first torsion spring leg of the torsion spring extends out from the torsion spring containing cavity and is connected with the armature; and a second torsion spring leg of the torsion spring is positioned in the torsion spring containing cavity. The magnetic releaser of the circuit breaker has advantages that: an initial included angle formed by the armature and the yoke keeps unchanged, and the magnetic releasing effect of the circuit breaker is ensured; and the magnetic releaser is simple in integral structure and easy to install.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a magnetic release of a circuit breaker . Background technique [0002] The magnetic release is usually set in the low-voltage circuit breaker and connected in series with the protected circuit. When the normal current passes through the line (circuit), the electromagnetic force generated by the electromagnet of the magnetic release is smaller than that of the reaction force spring (reaction spring). Pull force, the armature cannot be attracted by the electromagnet, and the circuit breaker is in a normal working state. However, when a short-circuit fault current occurs in the line (the industry is accustomed to call it a large current), the armature is attracted by the electromagnet, and the free trip is promoted through the protection mechanism The mechanism releases the main contact, and the main contact separates under the action of the...

AI Technical Summary

Problems solved by technology

That is to say, the reduction of the included angle φ between the armature 2 and the yoke 3 and the increase of the force of the first torsion spring foot 521 of the torsion spring 52 acting on the armature 2 are opposite to the effect of adjusting the operating current of the magnetic release, thereby Make the adjustment accuracy uncertain, and finally af

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