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Mechanism for operating small circuit breaker

A technology of small circuit breakers and operating mechanisms, applied in the direction of protection switch operation/release mechanism, etc., can solve the problem that the tripping force is not small enough, and achieve the effect of reducing the tripping force and improving the breaking capacity

Inactive Publication Date: 2005-08-17
ZHEJIANG CHINT ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the tripping force of the existing miniature circuit breaker operating mechanism structure is not sufficiently small while improving the contact pressure. Further improve the breaking capacity and reduce the tripping force under good contact pressure conditions

Method used

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  • Mechanism for operating small circuit breaker
  • Mechanism for operating small circuit breaker
  • Mechanism for operating small circuit breaker

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Embodiment Construction

[0027] Referring to the accompanying drawings, the operating mechanism of the present invention includes an operating handle 32 and a handle return spring 34, a pair of static contacts 5 and moving contacts 6 that are arranged oppositely in the housing 31, and the static contacts 5 are fixed on the fixed arm 4. Inside the shell 31. One end of the transmission link 33 is eccentrically arranged on the handle 32 , and the other end is connected with the jumper 19 , and the jumper 19 and the lock 27 form a disconnectable mechanical interlock independent of the operating handle 32 . The groove cam 21 is composed of two sections: the lower section is a circular arc with the locking point A as the center, so that the locking point A is in a stable position during the closing operation; the upper section is a plumb line, which can better ensure that the movable contact 6 There is proper sliding friction with the static contact 5 during the overtravel action, which improves the contact...

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Abstract

A manipulating mechanism for miniature breaker is characterized by that its jumper and contact arm are two-step boosting lever. Regulating their lever ratios can conveniently regulate the moving speed between contacts and the action force between jumper and lock for optimal match. A slotted cam mechansm is used to control the movement tracings of jumper and moving arm with low friction force.

Description

technical field [0001] The invention relates to an operating mechanism of a small circuit breaker. Background technique [0002] The operating mechanism of the existing miniature circuit breaker, as disclosed in the Chinese patent ZL88103427 "Operating mechanism of a miniature circuit breaker", is equipped with a pair of static contacts and moving contacts in the housing, and the moving contacts are connected to a four-point contact through the contact arm. The connecting rod operating mechanism is connected, and the closing or tripping is performed through the action of the handle. The operating mechanism is also equipped with a tripping device, which includes a thermal overload device with a bimetallic strip and / or an electromagnetic tripping device with a striker, which generates a tripping action when the line is overloaded or short-circuited to play a protective role. The structure of the miniature circuit breaker described above is well k...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H71/16H01H71/40H01H71/52
Inventor 潘祁阳
Owner ZHEJIANG CHINT ELECTRIC CO LTD
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