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circuit breaker

A technology for circuit breakers and circuits, applied in circuits, circuit breaker parts, electrical switches, etc., can solve the problems of reduced magnetic force of permanent magnets, reduced circuit breaking performance, resin damage, etc., and achieve the effect of preventing the reduction of circuit breaking performance.

Active Publication Date: 2016-04-13
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this state, the arc is attracted toward the permanent magnet, and there is a possibility that the resin covering the magnet may be broken due to the number of times of opening and closing. If the resin is broken, there is high heat that causes the permanent magnet to be exposed to the arc. The magnetic force is reduced and the breaking performance is reduced.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0026] figure 1 It is a longitudinal sectional view showing the overall structure of the circuit breaker in Embodiment 1 of the present invention, figure 2 yes means figure 1 The oblique enlarged view of the arc suppression device, image 3 yes means figure 1 The side enlarged view of the arc suppression device, Figure 4 means to pass through figure 1 A diagram of the magnetic field lines of the arc suppression device, Figure 5 It is a figure which shows the 2-pole circuit breaker in Embodiment 1, and the external wiring when this circuit breaker is used for a DC circuit.

[0027] Such as figure 1 As shown, the circuit breaker 101 is configured using a housing 10 formed of a base 11 and a cover 12 formed of an insulating material. Circuit breaking units 20 corresponding to the number of poles are arranged at intervals on the base 11 , and an opening and closing mechanism unit 30 having a known toggle mechanism is arranged above the circuit breaking units 20 . The co...

Embodiment approach 2

[0045] Image 6 It is a figure which shows the 3-pole circuit breaker in Embodiment 2 of this invention, and the external wiring when this circuit breaker is used for a DC circuit.

[0046] Embodiment 1 is an example of a 2-pole circuit breaker, but this embodiment is a configuration of a 3-pole circuit breaker 102 configured using three circuit breaking units 20 similar to those in Embodiment 1. In addition, since the circuit breaking means 20 is the same as Embodiment 1, description is abbreviate|omitted.

[0047] In the case of using the circuit breaker 102 for a DC circuit, as Image 6 As shown, the power-side terminal 24a is connected to the positive side of the DC circuit 60, the power-side terminal 24c is connected to the negative side of the DC circuit 60, and the load-side terminal 25a is connected to the power-side terminal 24b. The load 61 is connected to the load-side terminal 25 b on the positive side and connected to the load-side terminal 25 c on the negative ...

Embodiment approach 3

[0054] Figure 7 It is a figure which shows the 4-pole circuit breaker in Embodiment 3 of this invention, and the external wiring when this circuit breaker is used for a DC circuit.

[0055] Embodiment 1 is an example of a 2-pole circuit breaker, and Embodiment 2 is an example of a 3-pole circuit breaker. However, this embodiment is a 4-pole circuit breaker composed of four circuit breaking units 20 similar to Embodiment 1. The structure of the circuit breaker 103 . In addition, since the circuit breaking means 20 is the same as Embodiment 1, description is abbreviate|omitted.

[0056] In the case of using the circuit breaker 103 for a DC circuit, as Figure 7 As shown, the power supply side terminal 24a is connected to the positive side of the DC circuit 60, the power supply side terminal 24d is connected to the negative pole side of the DC circuit 60, and the load side terminal 25a is connected to the power supply side terminal 24b, and the load side terminal 25d is connec...

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PUM

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Abstract

In order to provide a circuit breaker such that a permanent magnet for driving an arc at the time of cutoff is not exposed to the high heat of the arc, the present invention is provided with: a base (11); power-source-side terminals (24) that are arrayed leaving spaces therebetween on the base (11); affixed terminals (27) connected to the power-source-side terminals (24) and having affixed contacts (21); mobile terminals (23) having mobile contacts (22) that contact and separate from the affixed contacts (21); an arc extinguishing device (50) that extinguishes the arc arising between the affixed contacts (21) and the mobile contacts (22); and a permanent magnet (54) provided on the power-source-side terminal (24) side of the arc extinguishing device (50).

Description

technical field [0001] The present invention relates to a circuit breaker capable of improving arc driving force by using a permanent magnet. Background technique [0002] For a circuit breaker that is used for both AC and DC circuits, compared with the case of using it for an AC circuit, when the circuit breaker is used for a DC circuit, since the DC current does not have a current zero point, it is difficult to control the high voltage is disconnected. [0003] For areas where the carrying current is large (for example, areas where the rated current exceeds 100A), the arc voltage increases due to the increase in the number of arc extinguishing plates, the magnetic driving force increases due to the decrease in reluctance, and the The insulating member that generates the arc-extinguishing gas is placed around the arc, and the gas driving force of the arc is driven to the arc-extinguishing plate side by using the pressure gradient of the gas, so that the DC rated voltage ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H73/18H01H9/44
CPCH01H9/443H01H9/40H01H73/18H01H2009/365
Inventor 三好伸郎伏见征浩小樋悠太白藤彰一
Owner MITSUBISHI ELECTRIC CORP