JPH06111706A - Circuit breaker - Google Patents

Abstract

PURPOSE:To provide a circuit breaker with high reliability capable of discharging arc gas to a load side efficiently requiring no special arc space. CONSTITUTION:A circuit breaker is provided with a breaker case 1A composed of a base 1a and a main cover 1c fixed to the base 1a and also containing a breaking mechanism, a recess 11 formed on a face 101 opposite to the base 1a of the main cover 1c so as to contain the auxiliary device of the breaking mechanism, and an auxiliary cover 12 fitted to the main cover 1c so as to block the recess 11. Exhaust paths 14-17 are formed between the main cover 1c and the auxiliary cover 12 so as to discharge the exhaust of an arc-extinguish chamber 6 to a load side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to exhaust of a circuit breaker.

[0002]

2. Description of the Related Art A conventional general circuit breaker will be described with reference to FIG. In the figure, 1 is a circuit breaker case consisting of a base 1a and a cover 1b which is detachably fixed to the base 1a, and 2 is a mover which opens and closes in the circuit breaker case 1 and has a movable contact 2a. There is. Reference numeral 3 denotes a stator having a fixed contact 3a which comes in contact with and separates from the movable contact 2a, and 4 denotes a terminal screw on the power source side arranged on the stator 3, to which an external conductor (not shown) is connected. Reference numeral 5 denotes a shield plate provided in the circuit breaker case 1, which separates the arc-extinguishing chamber 6 from the terminal screw 4. Reference numeral 7 is an exhaust hole provided in the shield plate 5, 8 is an auxiliary device such as an alarm switch and an auxiliary switch provided in the breaker case 1, and 9 is a handle for operating the cutoff mechanism such as the mover 2 from the outside.

[0003]

In the conventional circuit breaker, as described above, the arc gas at the time of breaking is discharged from the exhaust hole 7 to the vicinity of the terminal screw 4 on the power source side as shown by the arrow 10, so that the insulation between terminals is prevented. There was a problem that destruction occurred and it spread to the short circuit between phases.

The present invention has been made to solve the above problems, and an object thereof is to obtain a highly reliable circuit breaker capable of efficiently discharging arc gas to the load side without requiring a special arc space. .

[0005]

In the circuit breaker according to the present invention, an exhaust passage is formed between a main cover and an auxiliary cover so that the exhaust gas from the arc extinguishing chamber is discharged to the load side. Is.

[0006]

According to the present invention, since the exhaust passage between the main cover and the auxiliary cover can discharge the exhaust gas of the arc extinguishing chamber to the load side, no special arc space is required.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIGS. 1 is an external perspective view, FIG. 2 is a view in which an auxiliary cover and an auxiliary device are removed from FIG. 1, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. Are denoted by the same reference numerals and description thereof will be omitted. In the figure, 1A
Is a circuit breaker case consisting of a base 1a and a main cover 1c removably fixed to the base 1a, and 11 is a recess formed on the surface 101 of the main cover 1c opposite to the base 1a for accommodating the accessory device 8. Reference numeral 12 denotes an auxiliary cover that closes the recess 11 and is detachably attached to the main cover 1c. Reference numeral 13 denotes a load side terminal portion arranged on the base 1a, 14 a concave portion formed on the main cover 1c so as to cover the arc extinguishing chamber 6 above, 15 a groove formed on the auxiliary cover 12 in the power supply load direction, and 16 a concave portion. 14 is a communication port for communicating with the groove 15, and 17 is a step portion for communicating the groove 15 formed in the main cover 1c with the load side.

The arc gas at the time of interruption cuts from the recess 14 through the communication port 16 into the groove 15 as indicated by the arrow 18, and the arc 1
5 is discharged to the load side through the step portion 17. Thus, the surplus space of the main cover 1c and both covers 1c, 1
No extra arc space is required because the surplus space of the two mating parts is used as the exhaust flow path.

Further, the groove 15 communicates with the recess 11 for accommodating the accessory device 8 as described above, and the recess 1 is formed as a part of the exhaust passage.
If 1 is used, the installation measure of the accessory device 8 and the exhaust measure on the load side can be used together, and the external size can be reduced.

[0010]

As described above, according to the present invention, there is an effect that a highly reliable gas can be efficiently discharged to the load side without requiring a special arc space.

[Brief description of drawings]

FIG. 1 is an external perspective view showing an embodiment of the present invention.

FIG. 2 is a diagram in which an auxiliary cover and an accessory device are removed from FIG.

3 is a cross-sectional view taken along the line III-III in FIG.

FIG. 4 is a side view of a cross section of a main part showing a conventional circuit breaker.

[Explanation of symbols]

 1A Circuit breaker case 1a Base 1c Main cover 101 Surface of main cover opposite to base 4 Power supply side terminal screw 6 Arc extinguishing chamber 8 Auxiliary device 9 Handle 11 Recess 12 Auxiliary cover 13 Load side terminal 14 to 17 Exhaust flow Road

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiroshi Fujii 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Toshiyuki Tanibe 1-8 Midoricho, Fukuyama City Mitsubishi Electric Fukuyama Corporation In-house (72) Inventor Shinsaku Yamasaki 1-8 Midoricho, Fukuyama-shi Fukuyama Factory (72) Inventor Tsukasa Iio 1-8 Midori-cho, Fukuyama-shi Fukuyama Factory (72) Inventor Setsuo Hosogai 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Hirohiro Fujiwara 1-8 Midoricho, Fukuyama City Mitsubishi Electric Corporation Fukuyama Works (72) Inventor Shirou Murata Fukuyama 1-8 Midoricho, Yokohama-shi Fukuyama Works, Mitsubishi Electric Corporation

Claims (2)

[Claims] 1. A circuit breaker case including a base and a main cover fixed to the base and having a built-in breaking mechanism,
A circuit breaker having a recess formed on a surface of the main cover opposite to the base and accommodating an accessory device of the cutoff mechanism, and an auxiliary cover attached to the main cover to close the recess. The circuit breaker according to claim 1, wherein an exhaust passage is formed between the main cover and the auxiliary cover so that the exhaust gas from the arc extinguishing chamber is discharged to the load side. 2. The circuit breaker according to claim 1, wherein the recess for accommodating the accessory device is used as a part of the exhaust passage.