A switch is a component that opens (turn off) & close (turn on) an electrical circuit. whereas, a relay is an electrical switch that control (switch on & off) a high voltage circuit using a low voltage source. A relay completely isolates the low voltage circuit from the high voltage circuit.
Control Input or Coil Terminals:
Control input terminals are two input terminals of a relay that controls its switching mechanism.
A low power source is connected to these terminals to activate & deactivate the relay. The source can be AC or DC depending on the type of the relay.
COM or Common Terminal:
COM refers to the common terminal of the relay.
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