Voltage Monitoring Relay Circuit Diagram. The 50r single phase voltage monitor has a voltage sensing circuit which constantly monitors the sin. When the output from the comparator is low the transistor is in off state and the relay is in de energized state.
Relay switch circuit diagram working of the basic 5v relay circuit. Circuit diagram in this a relay 12v 500 ohms is connected to the collector of npn transistor. The out put voltage from the comparator is applied to the base of npn transistor through a resistance r1.
Operating mode the voltage monitoring relay cm ess 1 has 1 c o contact.
The 50r single phase voltage monitor has a voltage sensing circuit which constantly monitors the sin. Voltage monitoring relays. The circuit is based on the rc time delay and zener controlled switch. Abb s cm mps n three phase monitoring relays for rated voltage levels up to 820 v ac and 400 hz offer maximum flexibility and control.
