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Small breaker

A small circuit breaker and moving contact technology, which is applied in the direction of circuit breaker components, circuits, electrical components, etc., can solve problems such as burning of circuit breaker moving contacts, long distance for arc ignition, and difficulty in arc ignition. The effect of enhancing the arc striking ability, increasing the resistance of the arc column, and shortening the arc burning time

Active Publication Date: 2009-12-02
环宇集团(南京)有限公司
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

The above-mentioned arc ignition and arc extinguishing structure has the following disadvantages: the distance between the moving contact (2) and the arc extinguishing chamber (6) is relatively large, the distance for arc ignition is long, and the medium for arc induction is air; due to the above two reasons, As a result, it is difficult for the arc to strike the arc to the arc extinguishing chamber, the breaking capacity is poor, and the moving contact of the circuit breaker is easily burned by the arc.

Method used

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Embodiment 1

[0039] Figure 2 to Figure 15 A specific embodiment of the invention is shown in which figure 2 It is a schematic diagram of a three-dimensional structure of the present invention; image 3 yes figure 2 A front view of the shown miniature circuit breaker; Figure 4 yes image 3 A-direction view; Figure 5 yes image 3 B direction view; Figure 6 yes image 3 The internal structure schematic diagram of the shown miniature circuit breaker after part of the housing is removed; Figure 7 yes figure 2 A schematic diagram of a three-dimensional structure after the yoke and the arc guide plate are welded into one body in the miniature circuit breaker shown; Figure 8 yes figure 2 A schematic diagram of a three-dimensional structure of the arc guide plate in the miniature circuit breaker shown; Figure 9 yes figure 2 A schematic diagram of a three-dimensional structure of the upper gas-generating plate in the miniature circuit breaker shown; Figure 10 yes figure 2...

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Abstract

The invention discloses a small breaker. The breaker comprises a plastic shell, a movable contact, a static contact, an operation mechanism, an electromagnetic tripping mechanism, an arc extinguish chamber and a run-on tab, wherein the electromagnetic tripping mechanism comprises a magnetic yoke; one end of the run-on tab is electrically connected with the static contact, while the other end of the run-on tab extends into the arc extinguish chamber; and the arc extinguish chamber is positioned under the magnetic yoke. The small breaker is characterized by comprising an iron arc guide plate; one end of the arc guide plate, namely a fixed end, is fixed on the bottom of the magnetic yoke, while the other end of the arc guide plate, namely an arc guide end, is bent downwards and close to the movable contact. The small breaker has the advantages of effectively improving the capability of short circuit disjunction of the breaker, easily achieving the level of 6,000A energy level 3, and has short arcing time less than 6 milliseconds.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and in particular relates to a small circuit breaker. Background technique [0002] For the arc striking and extinguishing mechanism of existing miniature circuit breakers, see figure 1 , which is mainly composed of a moving contact (2), a static contact (3), an arc strike angle plate (7), a magnetic yoke (51) and an arc extinguishing chamber (6). When the circuit breaker works normally, the moving contact (2) and the static contact (3) are closed. When the outgoing current is short-circuited, the moving and static contacts are disconnected. The arc generated when disconnected is introduced into the arc extinguishing chamber (6) through the arc strike angle plate (7) and extinguished. The above-mentioned arc ignition and arc extinguishing structure has the following disadvantages: the distance between the moving contact (2) and the arc extinguishing chamber (6) is rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H73/18H01H9/44H01H73/20
Inventor 李丽芳魏荣玲林道静
Owner 环宇集团(南京)有限公司
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