Adjustable Magnetic Trip Units and Circuit Breakers

Abstract

The invention discloses an adjustable magnetic trip. The adjustable magnetic trip comprise a supporting frame (2), an iron core (3) fixedly connected with the supporting frame (2), an armature (4) rotationally arranged on the supporting frame (2) and keeping an electromagnetic attraction interval (8) with the iron core (3), a sleeve (5) connected with the supporting frame (2) in a position-adjustable mode, located on one side of the rotary axis of the armature (4) and pressing the armature (4) all the time, and a counter-force spring (6). One end of the counter-force spring (6) is connected with the supporting frame (2), and the other end of the counter-force spring (6) is located on the other side of the rotary axis of the armature (4) and is connected with the armature (4). An adjustment structure capable of adjusting the electromagnetic attraction interval (8) to adjust the electromagnetic attraction force between the iron core (3) and the armature (4) is formed on the adjustable magnetic trip. The adjustable magnetic trip can increase the adjustment range of the current of a disconnector, and is simple and compact in structure.

Description

technical field [0001] The present invention relates to the technical field of circuit breakers, in particular to an adjustable electromagnetic release, and a circuit breaker with the adjustable electromagnetic release. Background technique [0002] Circuit breakers are used as overload, undervoltage and short circuit protection devices for low-voltage power distribution systems and motor protection circuits. When the circuit is over-current, the trip unit of the circuit breaker will trip to cut off the circuit, thereby protecting the load equipment in the circuit system. and individual parts are not damaged. The electromagnetic tripping mechanism of the circuit breaker is used when a large current occurs in the line, the armature action attracts the contract and simultaneously pushes the tripping element of the circuit breaker to trip the circuit breaker to achieve the purpose of protecting the line. [0003] Existing electromagnetic trippers for circuit breakers generally...

AI Technical Summary

Problems solved by technology

[0004] However, since there are multiple current specifications under one current frame of the circuit breaker, in order to realize the stable operation of current tripping with different current specifications under the same frame, it is necessary to design multiple reaction springs with different tensions according to the magnitude of the current to ensure electromagnetic tripping. The stable action of the release makes the same electromagnetic release equipped with multiple reaction force springs, and one reaction spring only corresponds to a specific value of current specification

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