PH-102 Voltage Monitoring Relay

The PH-102 voltage monitoring relay is designed to de-energize an industrial/appliance single-phase 220V/50Hz load in case of inadmissible voltage variations in the mains with subsequent automatic re-energizing after the circuit parameters recovery. Load is connected to the relay either directly via relay terminals or through a magnetic starter, depending on the wattage.

The relay can operate in four independent modes:

Voltage monitoring relay
Minimum voltage monitoring relay
Maximum voltage monitoring relay
Time relay with a restart delay.

The device front panel features load status indicator (on/off) and three-digit, seven-segment display, which displays (depending on the device status):

Actual RMS voltage;
Accurate value of the set-up parameter;
Time remaining till automatic load re-energizing;
Emergency de-energizing the load (RMS voltage flashing).

The variable pot knobs on the front panel allow for setting:

The maximum allowable voltage tripping threshold;
The minimum allowable voltage tripping threshold;
Time delay for load re-energizing after the circuit parameters recovery.

The PH-102 equipment includes a surge protector which protects the switched load against high-frequency and high–voltage impulse interference.