Current-limiting small-sized breaker

A technology of small circuit breakers and current limiting coils, applied in circuit breaker parts and other directions, can solve problems such as poor breaking capacity and current limiting performance, and achieve the effect of improving breaking capacity, high arc voltage, and high current limiting performance

Active Publication Date: 2015-02-04
徐浩清
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of poor breaking capacity and current limiting performance of existing miniature ci

Method used

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  • Current-limiting small-sized breaker
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  • Current-limiting small-sized breaker

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0037] Example 1: Reference attachment Figure 1-6 , When there is a short-circuit current on the load side, the miniature circuit breaker will act, and the moving contact and the static contact will separate to produce an arc 9; at this time, the circuit current flows from the incoming terminal 21 through the trip system 4 (the trip system of the miniature circuit breaker includes Excitation release), static contact 32, arc 9, moving contact 31, internal conductor of the circuit breaker, bimetallic strip 5 (referring to the tripping piece formed by two different metal parts), wire, outlet terminal 22 flows to the load; the arc 9 generates steam under the action of magnetic blowing and the arc 9 contacts the insulator 62. A pressure difference is formed before and after the arc 9 to make the arc 9 move quickly to the arc-igniting piece 61. When the arc root at one end of the arc moves to the arc-igniting piece 61 , The circuit current flows from the incoming terminal 21 through ...

Example Embodiment

[0038] Example 2: Reference attachment Figure 7 with 8 , The second embodiment is opposite to the current direction of the first embodiment.

Example Embodiment

[0039] Example 3: Reference attachment Figure 9-13 , The third embodiment is the same as the first embodiment in the current direction, but the shape of the current limiting coil and the arc-initiating member are different.

[0040] Specifically, the current-limiting coils and arc-igniting pieces in the examples of all implementations can be of any shape, and the material can be any conductive material. The current-limiting coils should preferably be provided with a certain resistance to achieve better limiting. Flow effect. The bimetallic strip is connected with the terminal by a wire, the wire can be of any shape, the material can be any conductive material, it can be a plate, a strip, a profile, a hard material, a soft material.

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Abstract

The invention discloses a current-limiting small-sized breaker, and aims to solve the problems of poor breaking capacity and current limiting performance of the existing small-sized breaker. The breaker comprises a shell, wherein a contact system, a bimetallic strip, an arc striking system and an arc extinguishing system are arranged in the shell; the arc extinguishing system comprises an arc extinguishing chamber; the contact system comprises a movable contact and a fixed contact; the arc striking system comprises an arc striking sheet and an insulating member; the insulating member is provided with an accommodating cavity; the movable contact and the fixed contact are arranged in the accommodating cavity; the outer surface of the insulating member is provided with at least one annular current limiting coil; the two ends of the current limiting coil are connected with the arc striking sheet and the bimetallic strip respectively; the arc striking sheet is separated from the current limiting coil by the insulating member. According to the breaker, the breaking performance of the breaker is irrelative to a contact material on the premise of not changing the size of the shell, extremely high arc voltage can be quickly obtained, and the impedance of the breaker is improved to quickly extinguish electric arc, so that the breaker achieves higher breaking capacity and current limiting performance.

Description

technical field [0001] The invention relates to a circuit breaker, in particular to a current-limiting miniature circuit breaker. Background technique [0002] Miniature circuit breakers are protective devices used to protect circuits and electrical equipment from damage caused by overload or short circuit. Today's miniature circuit breakers not only protect circuit wires and electrical devices, but also have an important function of limiting short-circuit current during short-circuit. The performance of the miniature circuit breaker is mainly the breaking capacity and current limiting capacity. In order to improve the breaking capacity and current limiting capacity of the miniature circuit breaker, the arc generated during the breaking process should be quickly extinguished. At present, the following methods are used: 1. Moving contact and static contact 2. Under the guidance of the arc striker, the arc enters the arc extinguishing chamber; 3. The arc extinguishing gr...

Claims

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Application Information

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IPC IPC(8): H01H73/18
CPCH01H73/18
Inventor 徐浩清
Owner 徐浩清
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