L&T TYPE CONTACTOR-[40-AMP]4P

A contactor is an electrically operated, heavy-duty switch used to control high-power circuits for loads like motors, lighting, and heating, functioning like a remote-controlled relay but built for frequent switching and higher currents, using an electromagnet to open or close contacts when energized by a control signal

Common for single-phase motors (DOL/Semi Auto), providing 18V/100mA for starters.

 Larger units that automatically switch between 3-phase supplies, often with voltage protection.

Used to manually vary output voltage for testing, not typically for automatic switching.