Electromagnetic trip mechanism for low voltage circuit breaker

Abstract

The invention discloses an electromagnetic trip mechanism for a low-voltage circuit breaker. The electromagnetic trip mechanism comprises a bracket, an armature which is rotationally arranged on the bracket, a magnet yoke arranged between the bracket and the armature, a reset spring for providing resetting elastic force for the armature, and a pin shaft arranged on the bracket, wherein the bracket comprises two side walls and a connecting wall for connecting the two side walls; pivoting grooves are formed on the side walls; the armature comprises an actuating plate, two pivoting bosses which protrude out of the edges of the left and right sides of the actuating plate, and a reset rod positioned on the top of the actuating plate; each pivoting boss of the armature is positioned on a corresponding pivoting groove on the side wall of the bracket; the reset spring is a torsional spring sleeved on the pin shaft; and one end of the torsional spring is hooked on the armature, and the other end of the torsional spring and the bracket are fixedly arranged in an opposite way. The electromagnetic trip mechanism has the advantages of being compact in structure and relatively stable and relatively reliable in trip performance.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to an electromagnetic tripping mechanism for low-voltage circuit breakers. Background technique [0002] Circuit breakers are widely used products as overload, short circuit and undervoltage protection devices in low-voltage power distribution systems and motor protection circuits. The structure of a circuit breaker generally consists of a contact system, an arc extinguishing device, an operating mechanism, a tripping device, a plastic casing and optional accessories. The contact system includes dynamic and static contacts connected in pairs in the line. When the line where the circuit breaker is located is overloaded, short-circuited, under-voltage and other faults, the dynamic and static contacts will be opened within the specified time to cut off the line to protect the line and power equipment. Damaged; the arc extinguishing device is used to extinguish the...

AI Technical Summary

Problems solved by technology

In the electromagnetic tripping mechanism of this structure, the two sides of the armature need to be bent, and through holes need to be opened on it, which is not convenient for the process of the armature; The through hole corresponds to accommodate the support shaft to pass through, which is not conducive to saving parts. The assembly of the two is cumbersome and time-consuming. The installation of other devices such as bimetal components and operating mechanisms brings obstacles; when the circuit is short-circuited, the armature rotates, and its brake lever hits the drawbar in the operating mechanism, and the position of the armature should correspond to the drawbar, that is, it is specified The position of the electromagnetic tripping mechanism in the entire circuit breaker, so the position, shape, and size of the armature will affect the shape, size, and installation method of other parts of the circuit breaker, which will definitely affect the volume of the entire circuit breaker. It is difficult to realize the compact assembly of the internal components of the circuit breaker and the miniaturization of the circuit breaker itself

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