Perhaps the most challenging aspect of interpreting ladder diagrams, for people more familiar with electronic schematic diagrams, is how electromechanical relays are represented. Compare these two equivalent diagrams: Also, explain the operation of this motor control circuit. What happens when someone actuates the "Run" switch What happens when t

A relay is an isolated switch, there is no connection between the switching device and the connection. Relay is often used when controlling high voltage devices so that the intricate low voltage devices will not be damaged. There are many types of relays but the most commonly used ones are electromechanical relays. They are cheap, simple and provi