What is fuse? On what principle does it work ? Explain MCB. plz tell the answer fast if anyone knows.....
Answers
Answer:
FUSE: The material used to make the fuse wire is of a low melting point. As the current flowing through the fuse wire exceeds the designed value, the wire in the fuse melts and thus opening the circuit.
MCB: There are two types of operations of an MCB. The first depends on the thermal effect of over - current. The other depends on the electromagnetic effect of the over - current.
Thermal effect: When over - current flows, the bimetallic strip, owing to the thermal expansion of metals, is heated and deflects by bending. The deflection in the strip, releases a mechanical latch which is also connected with the MCB circuit opening mechanism and this opens the contacts of the MCB, disconnecting the faulty circuit.
Explanation:
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