What Does A PLC Relay Do? Relays are used to isolate one voltage level from another. A PLC may be used to control the operation of a medium-voltage motor, perhaps 2,300V or 4,160V. A relay is used to energize the starter, which, in turn, switches the motor voltage while the PLC controls the relay. What
Are Relays AC Or DC? General Purpose Relays are electromechanical switches, usually operated by a magnetic coil. General purpose relays operate with AC or DC current, at common voltages such as 12V, 24V, 48V, 120V and 230V, and they can control currents ranging from 2A-30A. Why is relay AC or DC? A relay is an
What Is The Symbol Of Relay? Relay circuit symbol The most widely used format shows the relay coil as a box, and the contacts are placed close by as shown below. Circuit symbol of a relay. Note that on this symbol, both normally open and normally closed contacts are shown. What is the unit of