What is the operating principle of a magnetic starter?

The operating principle of a magnetic starter is centered around the use of an electromagnetic coil. When electrical energy is applied to the coil, it generates a magnetic field that pulls in the armature, thereby closing the contact points. This action allows the power to flow through the connected motor or load, enabling its operation. The magnetic starter allows for remote control of the motor and provides protection features, such as overload relays to prevent overheating.

The electromagnetic coil's ability to open and close contacts efficiently makes it ideal for controlling larger loads in a safe manner. Moreover, once the coil is energized, the magnetic field will sustain the closed state of the contacts even if the energizing button is released, maintaining power to the motor until the circuit is interrupted. This design allows for quick and effective operation of electrical motors.