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Class S0 11-16 A overload relay is a protective device for electric motors, used in industrial switchboards together with the contactor. It is used to interrupt the circuit when the motor draws too much current for too long, preventing overheating, winding damage, and faults also due to phase failure. In the case of S0 models from 11 to 16 A, the trip threshold is adjustable in that range, so the relay can be calibrated according to the rated current of the motor.