Isolator

Isolator Points : What is Isolator, Definition The purpose of isolator is that it totally disconnects the motor, and its controller from the supply circuit. This becomes necessary; when working on the motor or the machinery that it drives, to guard against accidental starting, which would be most dangerous. It is always installed near the motor starter. It must plainly indicate whether it is in the open or closed position. It must open all the motor circuit wires simultaneously. The isolator must be manually operated. Any kind of circuit may be used for isolator. If a switch is used, it may be to stand the circuit current but larger switches are suitable for larger motors.

These switches do not need to be fused. However, if properly fused, they may also serve as the running over current protection. The isolator switch must be capable of being locked in the open position. If a machine has many motors, then we install only one isolator for all motors, but this isolator switch is essentially installed near the motor starters.