Zhejiang Aokai Electric Co.,Ltd
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Molded Case Circuit Breakers Work
- Dec 24, 2016 -

Low-voltage circuit breaker main contacts is to rely on manual or electric switch. After the 

main contacts are closed, trip-free mechanism on the primary contacts are locked in the 

closing position. Overcurrent release of coil and tripping the thermal components in series 

with circuit, undervoltage release coil and power supplies in parallel.

When the circuit is shorted or severe overload, overcurrent release armature absorbs, 

trip-free mechanism main contacts disconnect the circuit.

When the circuit overload, tripping the overload on the bimetallic element bends, 

driving trip-free mechanism main contacts disconnect the circuit.

When the circuit is under voltage, undervoltage release the bit release, trip-free mechanism 

main contacts disconnect the circuit.

When the button is pressed the shunt trip and shunt release armature absorbs, trip-free 

mechanism main contacts disconnect the circuit.

Classification

Low-voltage circuit breakers are classified according to different quenching medium, using 

air as a breaker of the extinguishing medium, known as the ACB (air switch), using an inert 

gas as breakers of the extinguishing medium, known as inert gas circuit breakers (noble gas switch), 

using oil as a breaker of the extinguishing medium, called oil circuit breakers (oil switch).