Answer / tamil

CB has a relay or contactors in it, which works on the
principal of electro-mechanical(which means when Voltage is
applied to the coil contact will change its position from NO
to NC)

Answer / shinde kv

basic principle of circuit breaker is contact make and
break in load condition without with arc quenching.yes it
has electro-mechanical principle

Answer / jairaj shetty

a circuit breaker , in its simplest form is a thermo
electric device . when the rated current is exceeded , the
thermal device , made up of bimetallic strip heats up and
bends , thus tripping the mechanically spring loaded
switch .
the other form of electro magnetic circuit works by
activating a magnetic relay instead of a bi metallic trip
device .

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