What is the difference between 2 way and 1 way switch
the 1 way switch has two contacts and the 2 way switch has three contacts in a 2 way switch there are two 1way switches combined in one one of the terminals can be connected to either of the two but not both at the same time.
what is magnetic contactor
Magnetic contactors are used for high power applications they allow a lower voltage and current to switch a much higher power circuit so they are generally larger and more heavy duty than control relays enabling them to switch higher power loads on and off for many thousands of cycles.

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