Small circuit breaker

A technology of small circuit breakers and moving contacts, which is applied in the direction of switches with electric heating and electromagnetic release, and can solve the problems of weakening magnetic blowing force, shortening geometric dimensions of magnetic blowing circuits, and difficulties

Inactive Publication Date: 2005-02-23
LEGRAND LOW VOLTAGE ELECTRICAL APPLIANCES WUXI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In traditional miniature circuit breakers, the role of the soft connection part and other effects caused by the magnetic blowing circuit in series are generally not considered, because the current carried by the soft connection part is different from the current value carried by the conductive part of other rigid structures. are the same, and the influence of its magnetic field effect on the arc blowing effect should not be ignored
[0010] In addition, in the series magnetic blowing circuit of the traditional miniature circuit breaker, when the arc generated between the moving and static contacts due to breaking the short-circuit current enters the arc extinguishing chamber, the transfer of the arc from the moving (static) contact to the arc plate must be

Method used

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Examples

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Embodiment Construction

[0025] figure 1 , figure 2 , Figure 3 shows a unit of miniature circuit breaker. A contact arc extinguishing system consisting of arc guide plate 1, moving contact 3, static contact 21, magnet guide sheet 26, arc isolation sheet 25 and arc extinguishing chamber 23 is installed in the plastic insulating shell; An operating mechanism and a free release mechanism composed of fasteners 18, springs 16, connecting rods 15 and handles 17; an overcurrent protection system composed of bimetallic strips 6, pull rods 10, adjusting screws 4 and arc guide plates 1 acting as supports ; A short-circuit protection system composed of electromagnet 20 and push rod 19.

[0026] The shell is riveted with appropriate metal rivets to form a unit (pole) structure of a miniature circuit breaker; then a miniature circuit breaker unit is combined side by side into multiple units, each unit includes a contact arc extinguishing system, an operating mechanism and a free The tripping mechanism, the ove...

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Abstract

The minitype breaker is composed of the contacting system, arc extinction system, operating apparatus, free dropout apparatus, short circuit protecting system, insulated shell and operating handle, etc. By handler transmission, the operating system drives the movable contact to make the connection and disconnectionof the minitype breaker to control the electric wiring and the electric power energy flow. By detecting the heat and magnetic effect of the electric current, the electric wiring can be protected from overloading and short circuit.

Description

technical field [0001] The invention relates to a miniature circuit breaker with overcurrent protection and short circuit protection. Background technique [0002] Within a unit size range, a small circuit breaker that includes functional units such as a contact system, an arc extinguishing system, an operating mechanism and a free tripping mechanism, an overcurrent protection system, a short circuit protection system, an insulating casing, and an operating handle is used through the handle transmission. The operating mechanism drives the moving contact in the contact system to make the small circuit breaker turn on and off, and realize the control of the power energy flow of the electrical circuit; through the sensing of the thermal and magnetic effects of the current, the electrical circuit is overloaded, Protection against faults such as short circuits. [0003] The structure of multiple unit sizes is composed of a multi-pole miniature circuit breaker by connecting the o...

Claims

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Application Information

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IPC IPC(8): H01H73/48H01H73/50
Inventor 刘国兴孔军王振宇陈翔李棣楠
Owner LEGRAND LOW VOLTAGE ELECTRICAL APPLIANCES WUXI
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