Explain Contactor Coil Operation and Voltage

What happens here

The presenter elaborates on the function of the contactor's coil. He explains that when electrical current is supplied to the coil, it generates a magnetic field. This magnetic force then causes an internal steel component to move, effectively closing or opening the contactor's main contacts. This allows for the simultaneous control of multiple circuits, such as 12 single-pole circuits for the larger lighting contactor shown. A crucial point emphasized is the necessity of identifying the coil's specific operating voltage, as contactors are manufactured with various coil voltages (e.g., 12V, 24V, 120V, 208V, 480V). He states that the demonstrated Square D contactor has a 120-volt coil.

Goal: Comprehend the electromagnetic principle behind contactor activation and the importance of matching coil voltage.