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Isolator is a mechanical switch which isolates a part of circuit from system as when required. Electrical isolators separate a part of the system from rest for safe maintenance works. So definition of isolator can be rewritten as Isolator is a manually operated mechanical switch which separates a part of the electrical power. Isolators are used to open a circuit under no load. Its main purpose is to isolate one portion of the circuit from the other and is not intended to be opened while current is flowing in the line.
1 A circuit breaker is a switch. 2  It performs the same function as a fuse, although a circuit breaker can be reset. 3  When the circuit breaker is thrown, the circuit is disconnected from the power source. 4  An isolator is a component that allows AC signals to pass, but stops DC signals.