A contactor works by using an electromagnetic coil to control electrical circuits. When the coil is energized, it creates a magnetic field that attracts the movable iron core, which in turn causes the contacts to change state. The normally closed (NC) contacts open, while the normally open (NO) contacts close, allowing current to flow through the circuit. This mechanism is essential for controlling high-power devices with low-voltage signals. When the coil is de-energized, the magnetic field disappears, and a spring returns the armature to its original position. This action restores the contacts—opening the NO contacts and closing the NC ones. Although DC contactors function similarly, they are designed differently from AC contactors because of the nature of direct current, which doesn't naturally interrupt like alternating current does. As a result, DC contactors often include additional features to manage arcing and ensure safe operation. Understanding the working principle of a contactor is crucial for anyone involved in electrical systems, as it plays a key role in automation and control applications.
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