Molded case miniature circuit breaker mcb generally consists of contact system, arc extinguishing system, operating mechanism, tripping device, shell and so on. When short-circuiting, the magnetic field generated by the high current (generally 10 to 12 times) overcomes the counterforce spring, the tripping device pulls the operating mechanism, and the switch trips instantaneously. When overload, the current increases, the heat increases, the deformation of the bimetal sheet to a certain extent to promote the mechanism action, it is necessary to pay attention to the greater the current, the shorter the action time. There is an electronic circuit breaker, using a transformer to collect the current size of each phase, compared with the set value, when the current is abnormal micro processor signal, so that the electronic tripping device to drive the operation mechanism. The function of the molded case circuit breaker is to cut off and connect the load circuit, and cut off the fault circuit, to prevent the expansion of the accident, to ensure safe operation. And high voltage circuit breaker to break 1500V, the current of 1500A-2000A arc, these arc can be stretched to 2m still continue to burn not extinguished. So re-arc is a big problem that high voltage circuit breaker must solve. The principle of blowing arc and extinguishing arc is mainly cooling arc to weaken thermal dissociation, on the other hand, by blowing arc to lengthen the arc to strengthen the combination and diffusion of charged particles, at the same time, the charged particles in the arc gap blowing away, quickly restore the dielectric insulation strength. Low-pressure molded case circuit breakers, also known as automatic air switches, can be used to switch on and off load circuits and to control motors that start infrequently. Its function is equivalent to the knife switch, over current relay, voltage loss relay, thermal relay and leakage protector and other electrical parts or all the functions of the sum, is an important protection of low-voltage distribution network.
Low pressure molded case miniature circuit breaker mcb has a variety of protection functions such as overload, short circuit, under-voltage protection, action value adjustable, high breaking ability, easy operation, safety and other advantages, so it is widely used. Low-voltage circuit breaker consists of operating mechanism, contact, protection device (all kinds of tripping device), arc extinguishing system, etc. The main contact of low voltage plastic circuit breaker is operated manually or electrically. After the main contact is closed, the free tripping mechanism locks the main contact on the closing position. The coil of the overcurrent release and the thermal element of the thermal release are connected in series with the main circuit, and the coil of the undervoltage release is connected in parallel with the power supply. When the circuit is short-circuited or seriously overloaded, the armature of overcurrent tripping device is closed to make the free tripping mechanism move and the main contact disconnects the main circuit. When the circuit is overloaded, the thermal element of the thermal release device heats up and bends the bimetallic sheet, which pushes the free release mechanism to act. When the circuit is undervoltage, the armature of undervoltage trip is released. Also enables free tripping mechanism action. Shunt trip is used for remote control. In normal operation, the coil is powered off. When distance control is required, press the start button to make the coil energized, and the armature drives the free trip mechanism to disconnect the main contact.
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