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Answer Posted / anand shukla
a relay is a sensing device ,which sense the fault and give
signal to the circuit breaker.
relay are many types which is is used in different
conditions.
1- electromagnetic relay
2- thermal overload relay
3-directional & nondirectiobal relay.
4- distance relay
5-mho relay
6-trip circuit supervision relay
7- master trip relay.
in realy some types of contacts are fitted
like no and nc which is interchange when current exceed a
preset value it means when relay operated.
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