Circuit Breakers

Circuit Breaker also known as automatic air switch, used to making and breaking load circuit can also be used to control the infrequent start motor. It functions as a

knife switch, over-current relay, voltage relay, thermal leakage protection relays and other electrical parts or all of the functions sum, low-voltage distribution

network is an important protective appliances.

With a variety of low-voltage circuit breakers protection (overload, short circuit, under voltage protection, etc.), the action is adjustable, high breaking capacity,

easy operation, safety, etc., so now is widely used. Structure and working principle by a low voltage circuit breaker operating mechanism, contacts, protection devices

(various releases), interrupter system components.

Low voltage air circuit breaker main contacts is by closing the manual or electric. Main contacts closed, trip-free mechanism will lock the main contact in the closing

position. Overcurrent release trip coil and hot thermal element in series with the main circuit, undervoltage release coil and power supply in parallel. When a short

circuit occurs or severe overload, over-current release of the armature pull, the free trip action, the main contacts disconnect the main circuit. When the circuit is

overloaded, the heat release of the heating elements heat the bimetal bent to promote free trip action. When the circuit under voltage, under-voltage release the

armature release. Also make free trip action. Shunt trip is used as a remote control, during normal operation, the coil is powered off, the need to distance control,

press the start button, so that the coil is energized, the armature driven trip-free mechanism action, so that the main contact Point disconnected.