Movable contact of low-voltage circuit breaker
A low-voltage circuit breaker and moving contact technology, which is applied in the direction of circuit breaker contacts, circuit breaker components, circuits, etc., can solve the problems of unfavorable promotion of arc, downward flow of air flow, weakening of arc driving effect, etc., and achieve improved short-circuit breaking capacity , increase the gas production area, improve the effect of gas production capacity
Active Publication Date: 2009-07-15
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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Problems solved by technology
[0002] As low-voltage circuit breakers, especially frame-type circuit breakers, develop toward miniaturization and high performance, domestic and foreign companies have introduced frame-type low-voltage circuit breakers with a frame current of 1600A. The common disadvantages of type circuit breakers are: the short-circuit breaking capacity is low, generally below 50kA, and it is difficult to meet the requirements of some occasions.
[0008] In addition, due to the well known and image 3 There is a large gap between the inner wall of the flange vertical plate 22 of the comb seat 2 of the moving contact shown in the structure and a group of parallel conductors 11 of the moving contact body 1, so when the circuit breaker breaks the short-circuit current, Part of the air flow will go down to the lower space of the moving contact, so that the gas released by the comb holder 2 will be weakened, which is not conducive to promoting the arc
[0009] In addition, since there are gaps between the inner surfaces of the first and second walls 23, 24 of the comb holder 2 and the outermost conductors in a group of parallel conductors 11 of the contact body 1, when the circuit breaker is disconnected At the moment of short-circuit current, part of the air flow will also flow down to the lower space of the moving contact, so that the gas released by the comb holder 2 will weaken the driving effect of the arc.
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[0026] In order to enable the examiners of the patent office and the public to further understand the technical essence and beneficial effects of the present invention, the applicant describes in detail the following specific but not exclusive embodiments.
[0027] see figure 1 , provides the contact body 1 as the movable contact which is the same as the prior art, a group of parallel conductors 11 of the contact body 1 whose number is not limited to the figure is pivoted on the rotary support shaft, and the rotary support shaft The two ends of the two ends are positioned on a pair of fixed plates 12, and the upper end of the fixed plate 12 is fixed to the insulating support 13, the lower end of the insulating support 13 is connected to the conductive block 14, and the lower end of a group of parallel conductors 11 is connected to the flexible conductive connecting wire 15. One end is electrically connected, and the other end of the flexible conductive connecting wire 15 is f...
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The utility model relates to a moving contact of a low-voltage circuit breaker, which is used for breaking short-circuit current and belongs to the technical field of low-voltage electrical appliances. The low-voltage circuit breaker includes a moving contact, a static contact, a mounting base, an operating mechanism, and a mounting base. The moving contact is installed in the moving contact cavity of the mounting base, and the static contact is fixed on the mounting base. , the operating mechanism is fixed on the installation base; the moving contact includes a contact body with a set of parallel conductors and a comb for mounting on the contact body and covering the parallel conductors The seat, the comb seat includes a flange, a flange vertical plate, first and second walls and a group of combs extending on the inner wall of the flange vertical plate, characterized in that: the upper surface of the flange Concave-convex bodies for increasing the area are formed. Advantages: The short-circuit breaking capacity of the circuit breaker is improved; the gas released from the comb seat is guaranteed not to be weakened; the strength of the gas released from the comb seat is consolidated.
Description
technical field [0001] The invention relates to a moving contact of a low-voltage circuit breaker, which is used for breaking short-circuit current and belongs to the technical field of low-voltage electrical appliances. Background technique [0002] As low-voltage circuit breakers, especially frame-type circuit breakers, develop towards miniaturization and high performance, domestic and foreign companies have launched frame-type low-voltage circuit breakers with a frame current of 1600A. However, this miniaturized frame The common disadvantages of type circuit breakers are: the short-circuit breaking capacity is low, generally below 50kA, which is difficult to meet the requirements of some occasions. [0003] For known technical applications, an effective way to improve the short-circuit breaking capacity is to design a current-limiting circuit breaker. The moving contact is quickly pushed away and then the mechanism is unlocked to open the circuit breaker, or the short-ci...
Claims
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IPC IPC(8): H01H73/04H01H11/04
Inventor周敏琛管瑞良俞晓峰
OwnerCHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)