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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

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E-mail:siwowm@siwo.com.cn

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Circuit Breaker Working Principle
Jun 12, 2017

  Circuit breaker working principle

  Circuit breakers generally by the contact system, arc system, operating mechanism, release, shell and so on.

  When the short circuit, the large current (usually 10 to 12 times) to produce the magnetic field to overcome the reaction spring,

  The trip unit pulls the operating mechanism and the switch is momentarily tripped. When the overload, the current becomes larger, heat increased, bimetallic deformation to a certain extent to promote the action of the body (the greater the current, the shorter the action time).

  Now there are electronic type, the use of the transformer to collect the current size of each phase, compared with the set value, when the current is abnormal when the microprocessor sends a signal, so that the electronic release device to drive the action.

  The role of the circuit breaker is to cut off and connected to the load circuit, and cut off the fault circuit to prevent the accident to expand and ensure safe operation. And high-voltage circuit breakers to break 1500V, current 1500-2000A of the arc, these arc can be stretched to 2m still continue to burn does not go out. So the arc is a high voltage circuit breaker must solve the problem.

  The principle of arc blowing is mainly to reduce the thermal dissipation of the cooling arc. On the other hand, the arc is reinforced by the arc-blown arc to enhance the recombination and diffusion of charged particles. At the same time, the charged particles in the gap are blown away and the dielectric strength of the medium is restored quickly.

  Low-voltage circuit breakers, also known as automatic air switches, can be used to turn on and off the load circuit, can also be used to control the motor is not frequent start. It is equivalent to the knife switch, over current relay, loss of pressure relays, thermal relays and leakage protection devices and other electrical parts of the sum of all the functions of low-voltage distribution network is an important protection of electrical appliances.

  Low-voltage circuit breaker with a variety of protection functions (overload, short circuit, under voltage protection, etc.), adjustable action value,

  High breaking capacity, easy operation, safety, etc., so it is widely used. Structure and working principle Low-voltage circuit breaker by the operating mechanism, contacts, protection devices (a variety of release), arc system and other components.