Low-voltage breaker tripper

Abstract

The invention relates to a triggering part of a tripping protection system of a low-voltage breaker, in particular to a low-voltage breaker tripper, belonging to low-voltage power transmission and distribution equipment. The low-voltage breaker tripper comprises a pair of conductor wiring terminals, i.e. a first wiring terminal and a second wiring terminal. The first wiring terminal and the second wiring terminal are respectively connected with a heating element and a double plate which is used as a magnetic field generating element; the heating element and the double plate are both arranged on a plastic support; the heating element is connected with the lower end of a bimetallic strip; the upper end of the bimetallic strip is connected with the double plate through flexible connection; and the double plate is provided with two elongated slots; the low-voltage breaker tripper also comprises a magnet yoke with two arms; the two arms of the magnet yoke pass through the two elongated slots on the double plate; a sheet armature which can be picked up by the magnet yoke is arranged in front of the two arms of the magnet yoke; and the armature can swing around the jointed shaft of the root of the armature. The invention has compact structure and high operating reliability, is convenient to manufacture and install and is easy to adjust in operating parameters.

Description

technical field [0001] The invention belongs to low-voltage power transmission and distribution equipment, and relates to a trigger component of a tripping protection system of a low-voltage circuit breaker, in particular to a low-voltage circuit breaker tripper. Background technique [0002] Thermal magnetic releases are widely used in low-voltage circuit breakers, and they are usually required to have two protection functions, namely, instantaneous short-circuit protection and delayed overload protection. However, due to the special characteristics of small load current and small frame size, it has brought great difficulties to the design. At present, solenoids are generally used to increase the magnetic field to meet the characteristics of instantaneous tripping; high-resistance alloy materials are used to increase the calorific value to adapt to delayed tripping. Its main disadvantage is: under the condition of high current short circuit, the solenoid coil is easy to bu...

AI Technical Summary

Problems solved by technology

Its main disadvantage is: under the condition of high current short circuit, the solenoid coil is easy to burn out

However, there are still defects in this structure: 1. Since the heating element is directly provided with a return-shaped groove that cooperates with the magnetic yoke, in fact the heating element simultaneously undertakes the two functions of heating and generating the required magnetic field. Its heating parameters and magnetic field The parameters must meet the requirements of their corresponding institutions, which brings great difficulties to its structural design and installation adjustment. It is difficult to adjust the parameters to the best in actual manufacturing and installation, thereby reducing the reliability of operation; 2. Its moving parts The structure is still relatively complicated, and it is difficult to manufacture and install, which increases the cost and reduces the reliability

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