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Shenyang SIWO Electrical Equipment Co., Ltd.

Add:No.22, Puyu Road, Dadong District, Shenyang City, Liaoning Province, China

Contact us:Gu Yu

Tel:+86-24-86413321-8057

Fax:+86-24-86413323

Mob:+86 13840234106

E-mail:siwowm@siwo.com.cn

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What Is The Choice Of Circuit Breakers?
Jul 20, 2017

  What is the choice of circuit breakers?

  1) Select the type and number of poles of the circuit breaker according to the application;

  Select the rated current of the circuit breaker according to the maximum operating current; select the type of the release, the type and specification of the accessories as needed. The specific requirements are:

  ① rated working voltage of circuit breaker ≥ line rated voltage;

  ② the rated short circuit breaking capacity of the circuit breaker ≥ line calculation load current;

  ③ the rated short circuit breaking capacity of the circuit breaker ≥ The maximum short circuit current (usually calculated according to the effective value) in the line;

  ④ line single-phase short-circuit current ≥ 1.25 times the circuit breaker instantaneous (or short delay) trip set current;

  ⑤ circuit breaker undervoltage release rated voltage equal to the line rated voltage;

  ⑥ circuit breaker shunt release rated voltage equal to the control power supply voltage;

  ⑦ electric drive mechanism rated voltage is equal to control the power supply voltage;

  ⑧ circuit breaker for the lighting circuit, the electromagnetic tripter instantaneous setting current generally take the load current 6 times.