Low voltage MCCB works

Breaker generally contact system, arc system, operating mechanism, release, shell composition.
When shorted, large current (generally 10-12 times) to overcome the magnetic field generated by the reaction force spring release mechanism is actuated pulling operation, switch instantaneous trip. When overloaded, the current becomes large, the heat intensifies, the bimetal deformed to a certain extent promote the agency action (the larger the current operating time is shorter).
E-now, the use of the phase current transformers collection size, compared with the set value, the microprocessor when the abnormal current signal, the electronic release mechanism is operated to drive operation.
The role of the circuit breaker is switched off and the load circuit, and cut off the fault circuit to prevent accident and to ensure safe operation. The high voltage circuit breakers to breaking 1500V, current 1500-2000A arc, the arc can be stretched to 2m these still continue to burn is not extinguished. It is a high voltage circuit breaker interrupter must be solved.
Arc blow-out main principle is to cool the arc heat free weakened, on the other hand to strengthen the arc by blowing the arc elongated circuit breakerscomposite and diffusion of charged particles, while the charged particles disperse the arc gap, the dielectric strength of the rapid recovery media.
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 breaker 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 mcb circuit breaker operating mechanism, contacts, protection devices (various releases), interrupter system components.
Low voltage 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.