How to choose low voltage breaker

Update date:2018-01-04 Source:maxge

Because electrical industry growth in China is relatively backward, the low voltage circuit breaker varieties, specifications and performance than lack, plus the imperfection of the current design code, and the user familiar with the product is not clear that the use of error, the low voltage circuit breaker in real engineering applying some unreasonable and even wrong usage, the operation and maintencircuiance of hard, failure, and left a lasting peace.

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how to choose lowvoltage breaker?

First,is to see the limits of the selected circuit breaker short circuit breaking capacity and running short circuit breaking capacity, the international electrotechnical commission IEC947-2 and the equivalent in IEC GB4048.2 \"low pressure switch equipment and control equipment of low voltage circuit breaker\" scale, limit short circuit breaking capacity and running a circuit breaker short circuit breaking capacity were clearly defined.

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Second,it is to see the clearance and creepage distance of the selected circuit breaker, electrical product clearance, certainly must do margin based on low voltage system, and edge matching is based on instantaneous over-voltage are limited to delimit the impulse withstand voltage, and the electrical appliances or equipment in the system of transient over-voltage also required under designated impulse voltage of the power supply system. Based on:

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(1) electric voltage shall be the rated as margin of power system or the rated voltage

(2) the rated impulse withstand voltage of the electrical appliances should be of the power system or the rated impulse withstand voltage

(3) electrical transient over-voltage of acuities were rated impulse withstand voltage of the power system

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