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How The Circuit Breaker Works

Jan 05, 2021


Circuit breaker, also known as automatic switch, is an electrical appliance that not only has the function of manual switch, but also can automatically protect against loss of voltage, undervoltage, overload, and short circuit. It is one of our essential appliances.


It can be used to distribute electric energy, start asynchronous motors infrequently, protect power lines and motors, etc., and can automatically cut off the circuit when they are seriously overloaded, short-circuited, and undervoltage. The automatic air switch is composed of operating mechanism, contacts, protection devices (various trips), arc extinguishing system, etc.


The composition includes: main contact, free trip mechanism, overcurrent trip, shunt trip, thermal trip, undervoltage trip, stop button. The main contact of the automatic air switch is manually operated or electrically closed. After the main contact is closed, the free trip mechanism locks the main contact in 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 severely overloaded, the armature of the overcurrent release pulls in to make the free trip mechanism act, and the main contact disconnects the main circuit.


When the circuit is overloaded, the heating element of the thermal trip unit will bend the bimetal and push the free trip mechanism to move. When the circuit is undervoltage, the armature of the undervoltage release is released. It also makes the free trip mechanism act. The shunt release is used for remote control. In normal operation, its coil is de-energized. When distance control is required, press the start button to energize the coil, and the armature will drive the free trip mechanism to move the main contact. Click disconnect.