Magnetic reserved tripping protection mechanism

Abstract

A magnetic reserved tripping protection mechanism comprises a fixed contact, a movable contact, a tripping mechanism, a magnetic tripping push rod and an operation handle, wherein the tripping mechanism comprises a lock catch, a movable contact rocker arm, a jump pin, a connection rod and a tension spring; the lock catch and the movable contact rocker arm are arranged on a support of a shell through a pin shaft A; the jump pin is hinged to the end, close to the operation handle, of the movable contact rocker arm through a pin shaft B; the jump pin and the operation handle are movably connected through the connection rod; the other end of the movable contact rocker arm is hinged to the tail end of the movable contact through a pin shaft C; the tension spring is connected between the movable contact rocker arm and a supporting shaft of the far end of the shell; a torsional spring is also arranged on the tripping mechanism and installed on the movable contact and the movable contact rocker arm through the pin shaft C; the movable contact makes electric contact with the fixed contact under the action of the torsional spring. The magnetic reserved tripping protection mechanism is applied to a breaker, so that the breaker has the selective protection function of a distribution line, and flexibility and reliability of a distribution system are improved.

Description

technical field [0001] The invention relates to the technical field of electrical equipment, in particular to a magnetic backup trip protection mechanism. Background technique [0002] Miniature circuit breakers are important electrical components in low-voltage power distribution industry and civil equipment, and are mostly used at the end of low-voltage power distribution systems. At present, small circuit breakers at home and abroad all use thermal magnetic technology principles and schemes to realize their protection characteristics against current overload and short circuit. Selective protection requirements for the system, low reliability of power supply. [0003] With the construction of smart grid and the intelligentization of power grid users, higher requirements are put forward for the reliability of the terminal power distribution system, which objectively promotes the demand for intelligent miniature circuit breakers. In order to meet the requirements of select...

AI Technical Summary

Problems solved by technology

However, its protection characteristics are single and unadjustable, and motor protection cannot be realized, and the traditional protection tripping method of sensing overload current by heating elements is still used, which fails to solve the problem of energy loss itself

In addition, the existing small leakage circuit breaker is composed of the leakage tripping module assembled by the small circuit breaker. Due to the large width of the leakage tripping module, the width modulus of the small leakage circuit breaker is greatly increased, so the volume of the distribution box is relatively small. Big

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