The definition and concept of relays
So-called relay is made up of electric magnet (1) (2) contact structure, "when electromagnetic stone by more than a certain value of current will produce electromagnetic attraction, using the electromagnetic attractive and can work with the driver contact structure, using the attached to the coil voltage and current (input signal) to control the open and close contact of machine".
The simple explanation is
The relay device, which receives the electrical signal from the switch, etc., which is transmitted to the output department of the motor
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