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An S2 class 40-50 A overload relay is a protective device for electric motors that trips when the motor draws a current higher than the set current, preventing overheating, winding damage and sudden system shutdowns. In this size, the relay is adjustable between 40 and 50 amperes, so it is chosen for motors whose rated absorption falls within that range. It usually works together with a contactor, on which it is often mounted directly, to make a compact motor circuit protection.