Power system protection and operation of the major electrical devices

Can carry, closing and breaking the normal operation of the line currents can also be carried within the stipulated time, closing and breaking currents under abnormal (such as short-circuit current) switching equipment, power system protection and  air circuit breaker  of the major  electric meter  devices. Circuit-breaker many different types, but basically the main circuit are electrically conductive, insulating support member, and the interrupter operating mechanism composed of several parts. mcb circuit breaker  include: ① a conductive main circuit, through the movable contact, static contact and separation of the contacts on the circuit implementation and isolation; ② interrupter, the circuit breaking arc generated during the sealed chamber under a high pressure in rapidly within tens of milliseconds off, cut off the circuit;