Magnetic contactor:
magnetic contactor is a device that is powered by magnetism. Used to open and close the contacts in the motor control circuit, may also be called a magnetic switch or a contactor.
Relay :
relay is an electrically operated switch. It consists of a set of input terminals for a single or multiple control signals, and a set of operating contact terminals.
Types :
Electro-mechanical, solid state and reed.
Semiconductor:
A semiconductor is a substance that has specific electrical properties that enable it to serve as a foundation for computers and other electronic devices.
Types :
Sillicon, germanium, gallium arsenide.
Diode:
diode is a two terminal electrical device. Diodes are made from a semiconductor, most often silicon but sometimes germanium.
Types :
Zener, Rectifier, Schottky, Transient Voltage Suppressor, Thyristor, Silicon Controlled Rectifier, and TRIAC.
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