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Circuit breaker shock absorber apparatus, assembly and method of operation

A technology for absorbers and circuit breakers, which is applied in circuits, electrical components, parts of protection switches, etc., can solve problems such as defects in absorber equipment

Inactive Publication Date: 2017-09-01
SIEMENS AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, existing absorber devices are deficient for several reasons

Method used

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  • Circuit breaker shock absorber apparatus, assembly and method of operation
  • Circuit breaker shock absorber apparatus, assembly and method of operation
  • Circuit breaker shock absorber apparatus, assembly and method of operation

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Embodiment Construction

[0022] Certain conventional circuit breakers may have a tendency for the electrical contacts to separate under substantial force when subjected to a short circuit event. This causes one or more contact arms to rotate rapidly. At the end of its rotational travel, the contact arm can come into contact with a part of the circuit breaker housing. In order to absorb shock and limit damage to the circuit breaker housing, prior art circuit breakers included shock absorbers contacted by contact arms in an attempt to absorb the shock of one or more of the contact arms being blown away. However, existing shock absorber designs have been inefficient. In particular, some designs do not act directly on the contact arms, but on eg crossbars. Therefore, damping is not applied directly to the moving contact arm, thereby applying stress to other system components. In other systems, the contact arms contact the shield and a thin layer of absorbing material is provided on the back of the insu...

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PUM

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Abstract

Embodiments disclose a circuit breaker shock absorber apparatus configured to absorb shock due to blown off of one or more circuit breaker contact arms. A circuit breaker shock absorber apparatus having a base coupled directly or indirectly to a circuit breaker enclosure and an absorber body comprising a damping material having a tan delta greater than about 0.45 at 10% strain and 10 Hz and room temperature, and a Type A hardness according to ASTM D2240 of less than about 60. A circuit breaker shock absorber assembly and method of operating the circuit breaker shock absorber assembly are provided, as in the other aspects.

Description

technical field [0001] The present invention relates generally to circuit breakers for interrupting electrical current from a source of electrical power, and more particularly to circuit breaker shock absorbers. Background technique [0002] Circuit breakers are used in some electrical systems to protect circuits coupled to sources of electrical power. Such circuit breakers may include open, closed and trip configurations. Some circuit breakers may experience a magnetic repulsion force when tripped which causes the contact arms carrying the movable electrical contacts to move very violently. Prior art circuit breakers have included shock absorber elements to lessen the severity of tip impacts to some extent. However, existing absorber devices are deficient for several reasons. [0003] Accordingly, there is a need for circuit breakers that include improved shock absorbers. Contents of the invention [0004] In a first aspect, a circuit breaker shock absorber apparatus ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H3/60H01H71/02
CPCH01H3/60H01H71/025H01H71/121H01H71/504H01H71/02
Inventor J.罗吉科
Owner SIEMENS AG