How does the miniature circuit works?
Answers
Answer:
Whenever continuous overcurrent flows through MCB, the bimetallic strip is heated and deflects by bending. ... As this mechanical latch is attached with the operating mechanism, it causes to open the miniature circuit breaker contacts, and the MCB turns off thereby stopping the current to flow in the circuit.
Answer:
Explanation:
Miniature Circuit Breaker (MCB) is generally used in low voltage applications such as domestic lighting, industrial automation panels,etc.
MCB are generally used to provide protection from over load & short circuit conditions.
It can make or break the electrical circuit under normal as well as abnormal conditions.
The MCB has various parts which consist of incoming and outgoing electrical terminals, arc chamber ,bimetallic strip(thermal protection), solenoid (electromagnetic protection), knob switch, plunger, fixed & moving contacts.
Working Principal:-
The MCB works on two principle I) Electromagnetic Effect, II) Thermal Effect.
Under normal working condition the current flow through incoming terminal, fixed & moving contacts,solenoid , bimetallic strip(bends to predefined level),outgoing terminals.
I) Electromagnetic Effect:-
Whenever the condition of SHORT CIRCUIT occurs then their is heavy current flow through solenoids.
due to sudden change electromagnetic field of solenoid the plunger is attracted upwards which in turn releases the latch mechanism and contacts get open.the arc formed is extinguished in arc chamber.
II) Thermal Effect:-
Whenever the condition of OVER LOAD occurs in the electrical circuit, then the low magnitude low current flows which leads to bimetallic strip bends further than predefined level due to which latch mechanism is released and contacts gets open. the arc formed is extinguished in arc chamber.