Under voltage release of low voltage circuit breaker

Abstract

The present invention relates to a low-voltage tripping mechanism of a low-voltage breaker. The tripping mechanism comprises an electromagnetic mechanism housed in front portion of a chamber of a case and an electronic module housed in rear portion of the case; the electromagnetic mechanism comprises an armature, a front yoke, a working coil, a baffle and a rear yoke, characterized in that a permanent magnet is disposed between the rear yoke and the baffle, a closed coil is disposed between the working coil and the baffle, a power storage spring is mounted in the chamber behind the armature with the spring counteracting against the baffle, the circuits of said electronic module comprises a low-voltage detecting circuit, a synthetic signal controlling circuit, a main controlling circuit and a D.C. power supply. It's advantages include such as small volume simple structure, constant holding force, the coil being not overheated in high voltage, the contacts being closed reliably in low voltage, actuating voltage being accurate, power-saving and low noise.

Description

technical field [0001] The invention relates to an undervoltage tripper of a low-voltage circuit breaker, belonging to the technical field of circuit breakers. Background technique [0002] Low-voltage circuit breakers are mainly responsible for overload, undervoltage and short-circuit protection of distribution lines and equipment. The undervoltage release is the mechanism for the above-mentioned circuit breaker to perform undervoltage protection on low-voltage lines and electrical equipment. The undervoltage release needs to be powered continuously for a long time, and its action characteristics should reach: when the power supply voltage is lower than 35% of the rated working voltage, the undervoltage release cannot be closed, preventing the circuit breaker from closing; when the power supply voltage is equal to or greater than the rated When the working voltage is 85%, it should be able to close to ensure reliable closing of the circuit breaker; when the power supply vo...

AI Technical Summary

Problems solved by technology

[0007] 1. The release coil is a parallel coil, and the voltage is applied to both ends of the coil. When the voltage rises, the current increases, and the coil will heat up and burn out after long-term operation;

[0008] 2. The number of turns of the parallel coil is large, and the inter-turn voltage is high. If the insulation of the coil is poor, it will cause a short circuit and burn the coil;

[0010] To solve the problems encountered by the above-mentioned release, the difficulty lies in: 1. It is impossible to cancel the limitation of the user's power voltage range; 2. Strengthening the inter-turn insulation will inevitably increase the volume and cost; 3. Adopt a power-assisted structure, The installation of the undervoltage release is restricted, the volume increases, and the installation, commissioning and maintenance of the release are difficult

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