Patent ID: 8786998

Claim:
An electro-magnetic contactor for supplying or cutting off power to a load, the electro-magnetic contactor comprising: a status monitoring circuit configured to determine a status of input power, and display the status of the input power based on an input voltage of the input power that supplies electric energy to the electro-magnetic contactor; and a magnetic switching circuit connected to the input power in parallel to the status monitoring circuit, the magnetic switching circuit configured to receive the input voltage from the input power, and provided with an electromagnetic coil to supply power to a load while repeating a conducting state and a cut-off state wherein the status monitoring circuit comprises: an input voltage detection circuit connected to the input power and configured to detect the input voltage; a comparison circuit connected to an output of the input voltage detection circuit and configured to compare the detected input voltage with one or more preset reference voltages, and output the status of the input power according to a corresponding comparison result; a display connected to an output of the comparison circuit and configured to display the status of the input power outputted from the comparison circuit; a surge absorption circuit connected to the input power in parallel to the input voltage detection circuit, the surge absorption circuit configured to absorb a surge contained in the input voltage when the input voltage is an over voltage; and a constant voltage circuit having an input connected to an output of the surge absorption circuit, the constant voltage having an output connected to each of the input voltage detection circuit and the comparison circuit, the constant voltage circuit configured to rectify the input voltage to output a constant voltage, wherein the voltage detection circuit and the comparison circuit are each configured to operate in accordance with a signal from the constant voltage circuit.