PURPOSE: A detachable HMI(Human Machine Interface) protection relay is provided to facilitate maintenance and repair of an HMI and a repair body by detachably combining the relay body with the HMI.;CONSTITUTION: A detachable HMI protection relay includes a relay body(320) and an HMI(350). A measuring unit and a relay are arranged on the relay body. The measuring unit measures the current of an object. A relay relays the object when the current measured by the measuring unit is abnormal. The HMI is combined with the relay body and controls the relay. The HMI displays the status of the measuring unit and the relay.;COPYRIGHT KIPO 2011
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