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Tripping device of low voltage molded case circuit breaker

A technology for molded case circuit breakers and tripping devices, which is applied to emergency protection devices, circuits, and parts of protection switches, can solve problems such as difficulty in realizing self-locking, the influence of short-circuit protection characteristics, and inconvenience, so as to achieve the highest manufacturing cost. Effect

Active Publication Date: 2018-06-05
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is generally applicable to realize the cooperation between parts by adopting the rotating structure to meet the adjustment requirements for the pretightening force of the reaction force spring. It is very troublesome (that is, very inconvenient), because it is difficult for the helical surface to realize self-locking under force, and it will inevitably rotate due to force, so it will inevitably affect the short-circuit protection characteristics

Method used

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  • Tripping device of low voltage molded case circuit breaker
  • Tripping device of low voltage molded case circuit breaker
  • Tripping device of low voltage molded case circuit breaker

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Embodiment Construction

[0022] See Figure 1 to Figure 9 , shows a housing 1 of the structural system of a low-voltage molded case circuit breaker, an operating mechanism 2 and a tripping device 3 arranged in the housing 1. The aforementioned tripping device 3 includes a short-circuit instantaneous protection release and a In actuating the drawbar 32 of the aforementioned operating mechanism 2, the aforementioned short-circuit instantaneous protection release is one or more than two (three in this embodiment), including an armature 34, an adjusting rod 31, and an armature 34. The counter spring 36 providing the restoring force, the adjustment rod 31 is located between the armature 34 and the draw rod 32 , the aforementioned adjustment rod 31 is slid and pivoted on the housing 1 in the axial direction. In this embodiment, the housing 1 includes a base 15, the short-circuit instantaneous protection release is set in the base 15, and the base 15 is set in the housing 1, preferably the adjusting rod 31 i...

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Abstract

A tripping device for a low-voltage molded case circuit breaker comprises a shell, an operating mechanism arranged in the shell and a tripping device body. The tripping device body comprises a short-circuit instantaneous protection tripper and a traction rod used for driving the operating mechanism to act, the short-circuit instantaneous protection tripper comprises armatures, an adjusting rod and counter-force springs for providing restoring force for the armatures, the adjusting rod is arranged on the shell in a pivoted mode, and the counter-force springs connect the adjusting rod with the armatures; when a short-circuit current flows through the tripping device body, the armatures drive the traction rod to pivot, the traction rod unlocks the operating mechanism to drive a circuit breaker to cut off a circuit, the shell is provided with an indicating portion extending window, the adjusting rod is provided with an indicating portion, and the indicating portion extends into the indicating portion extending window and is matched with the indicating portion extending window; when axial adjustment is conducted on the indicating portion, the spring force of the counter-force springs is changed, and therefore an action current value of the short-circuit instantaneous protection tripper can be adjustable. Pushing of the adjusting rod is achieved by directly pushing the indicating portion of the adjusting rod, adjustment of the counter-force springs is achieved, and the structure is simple.

Description

technical field [0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a tripping device for a low-voltage molded case circuit breaker. Background technique [0002] The tripping device mentioned above mainly refers to the thermal tripping device, more precisely, it refers to the thermal magnetic tripping device (the industry is still used to call it "thermal magnetic tripping device"). There are two main structural forms of thermal-magnetic tripping devices: one is an overload long-time protection tripping device composed of metal thermal elements; the other is a short-circuit protection instantaneous tripping device in the form of an electromagnet. When an abnormal current in the circuit is detected, the tripping device acts and actuates the tripping of the circuit breaker to cut off the circuit. In addition, according to whether the current setting value of the circuit breaker is adjustable or not, it can generally be divide...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H71/74H01H71/02H01H71/40
CPCH01H71/02H01H71/40H01H71/7463
Inventor 顾建青王炯华唐维春
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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