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Motor management relays are used for the protection of Motor from many factors/faults like, Thermal Overloads
Relay is used for switching the winding to get reliable start, e.g first it turn on the starting winding with running winding to the main supply after that it switched to the running winding.
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this relay is control high voltage in motor and is operated by key lock switch the relay itself may have up to 24 contact points with in unit itself. this allows the control power for multiple machine to be locked out by the turn of single key switch.
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You can find the same trick at work in all kinds of machines and electrical appliances, where sensors are ready to switch things on or off in a fraction of a second using clever magnetic switches called relays.