Electromagnetic Contactor A contactor, in which the main contacts close and open through electromagnetic effect.
Electro-pneumatic Contactor This is a contactor in which force provides for opening or closing the main contact through the electrically operated pneumatic device.
Main Circuit Current flows from supply to the load through main circuit. This circuit is designed for closing or opening the conducting parts of the contactor.
Main Contact When a Contactor is in Close position, then main contacts in the main circuit are responsible to carry the load current
Control Circuit That circuit which is designed for the closing or opening operation of the contactor. This circuit is electrically energized or de-energized normally.
Auxiliary Circuit As the name indicates, this is another circuit except main and control circuit i.e. auxiliary circuit.
Make Contact That Control Contact, which closes when main contact closes.
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