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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 circuit breakers in the background technology, the present invention provides a current limiting miniature circuit breaker

Method used

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  • Current-limiting small-sized breaker

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment one: refer to attached Figure 1-6 , when a short-circuit current occurs on the load side, the miniature circuit breaker operates, and the moving contact and the static contact separate to generate an arc 9; at this time, the circuit current passes through the tripping system 4 from the incoming terminal 21 (the tripping system of the miniature circuit breaker includes Excitation release), static contact 32, arc 9, moving contact 31, internal conductor of circuit breaker, bimetal sheet 5 (referring to the tripping piece formed by two different metal parts), wire, and outlet terminal 22 flows to the load; the arc 9 generates steam under the action of magnetic blowing and the contact between the arc 9 and the insulator 62, forming a pressure difference before and after the arc 9, so that the arc 9 moves quickly to the arc striker 61, when the arc root at one end of the arc moves to the arc striker 61 , The circuit current flows from the incoming terminal 21 thr...

Embodiment 2

[0038] Embodiment two: refer to attached Figure 7 with 8 , the current direction of the second embodiment is opposite to that of the first embodiment.

Embodiment 3

[0039] Embodiment three: refer to attached Figure 9-13 , Embodiment 3 has the same current direction as Embodiment 1, but the shapes of the current-limiting coil and the arc striker are different.

[0040] Specifically, the current-limiting coils and arc-leading pieces in the examples of all embodiments can be in any shape, and the material can be any conductive material. The current-limiting coil is preferably provided with a certain resistance, which can better limit flow effect. The bimetal sheet and the terminal are connected by wires, the wires can be in any shape, and the material can be any conductive material, such as plate, strip, profile, hard material or 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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