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Low-voltage circuit breaker

A low-voltage circuit breaker and contact technology, applied in circuit breaker parts, circuits, electrical components, etc., can solve the problem that the upper contact does not play a protective role, and achieve the effect of improving breaking capacity and improving electrical life.

Active Publication Date: 2009-09-30
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

Obviously, this technical solution also only helps to protect the lower contacts, and does not play an ideal role in protecting the upper contacts.

Method used

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  • Low-voltage circuit breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] please see figure 1 and figure 2 , see first figure 1 , presents a known low-voltage circuit breaker, which includes a housing 2, a contact system 1 disposed on the housing 2, a tripping system 3, and a pair of arc extinguishing grid brackets 41, an arc extinguishing chamber 42 and a stack The arc extinguishing mechanism 4 formed by grid sheet 43. Please focus on figure 2 , the contact system 1 (also known as the contact mechanism) includes an upper contact 11 that is electrically connected to the aforementioned tripping system 3 through a flexible connecting wire 112 and is located at the bottom of the arc extinguishing chamber 42 and corresponds to the upper contact 11. The lower contact 12, as known in the industry, the upper contact 11 is connected with the operating mechanism of the low-voltage circuit breaker through the rotating shaft 113.

[0024] As the technical gist of the technical solution of the present invention, the arc extinguishing mechanism 4 ...

Embodiment 2

[0028] please see image 3 , in this embodiment, the insulating varnish 46 is selected as the insulating device, and the position of the insulating varnish 46 on the body of the arc striking plate 44 is the position corresponding to the arc extinguishing chamber 42 on the body of the arc striking plate 44, namely A pair of support arms 443 and a portion of transition plate 444 are shown. According to professional knowledge, the first and second arc striking surfaces 441, 442 are not allowed to be covered with insulating varnish 46, otherwise the arc striking function will be lost. Again, if the remaining parts of the arc running plate 44 are covered with insulating varnish 46 except the first and second arc running surfaces 441, 442, it is certainly feasible. The rest of the positions mentioned here include a pair of support arms 443, transition All of the board 444 and the electrical connector 4441, but considering the principle of economy, since a pair of support arms 443 c...

Embodiment 3

[0030] please see Figure 4 , the insulating film 47 is selected to take on the role of the insulating device. In this embodiment, a flame-retardant insulating tape is used as the insulating film 47, wrapped around a pair of supporting arms 443 and the transition plate 444 (a part of the transition plate 444) of the arc striker 44 )superior. Same Example This embodiment does not need to use the insulating support 45 composed of the insulating support body 451 and the support sleeve 452 as the insulating device like the first embodiment, and the rest are the same as the description of the second embodiment.

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Abstract

The invention relates to a low-voltage circuit breaker belonging to the technical field of low-voltage apparatus and comprising a shell and a contact system, a release system and an arc extinguishing mechanism, wherein the arc extinguishing mechanism comprises a pair of arc extinguishing grating sheet brackets and a stack grating sheet; and the contact system comprises an upper contact and a lower contact. The low-voltage circuit breaker is characterized in that the arc extinguishing mechanism also comprises an arc striking plate and an insulation device, one end of the arc striking plate extends above an explosion chamber and corresponds to the outer side of the movement locus of the upper contact, and the other end is electrically connected with the release system; and the insulation device is directly combined on the arc striking plate or is arranged on the lower contact. The invention has the advantages that the upper contact can be protected, thereby the electrical endurance of the breaker is improved obviously; the arc striking plate extends above the explosion chamber, thereby being convenient for voltaic arc to enter the explosion chamber and enabling the breaking capacity of the breaker to be improved.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a current-limiting low-voltage circuit breaker with an arc-starting component. Background technique [0002] The aforementioned low-voltage circuit breaker with current-limiting type and arc-starting parts is used to break and connect the circuit in the distribution line, more specifically, through the closing or closing of a pair of separable contact pairs of the contact system. Separation realizes the connection or disconnection of the line to protect the line and equipment. When an abnormal fault occurs in the line, such as a short circuit, the contact pair is separated to quickly break the line to avoid equipment damage. As is well known in the industry, when the contacts are separated under the condition of current carrying, an arc will be generated, especially when breaking the short circuit and high current, the energy of the arc is l...

Claims

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Application Information

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IPC IPC(8): H01H73/18H01H9/34
Inventor 刘洪武谢心意王云峰王铖管瑞良
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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