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Definition Elect Thermal-overload Protector

A protective device specifically designed to prevent damage to an electrical motor due to failure of the motor to start, severe overloading of short duration, too frequent starting, high ambient temperature, high or low circuit voltages, failure of ventilation or any combination thereof. It is designed to be either automatically or manually reset. Excludes circuit breakey; switch (1), thermostatic; heater, thermal release; and relay (1), thermal.