BREAKER: A breaker is a device designed to isolate a circuit during an overcurrent . a breaker is resettable protective device that protects against two types of overcurrent situations ; overload and short circuit.
so a MCB must be able protect equipment form short circuit current and overload.
inside MCB there are two main things.
1) bimetalic strip :during over load this bimetalic strip heats up and bends this will break the circuit.
2) solenoid (electromagnet): during short circuit high amount of current flows in the solenoid which moves a plunger(rod) and breaks the circuit.
apart from this MCB can be manually switched off.
you can clearly understand this with the help of the below figure and video.
source :youtube.
so a MCB must be able protect equipment form short circuit current and overload.
inside MCB there are two main things.
1) bimetalic strip :during over load this bimetalic strip heats up and bends this will break the circuit.
2) solenoid (electromagnet): during short circuit high amount of current flows in the solenoid which moves a plunger(rod) and breaks the circuit.
apart from this MCB can be manually switched off.
you can clearly understand this with the help of the below figure and video.
single pole mcb inside parts.
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