The signal powered High Voltage Relay BHVR272 is used to monitor critical voltage levels (low or high) up to 490Vac / 700Vdc. Typical applications include field excitation on DC motors and over voltage monitoring on 600Vdc systems. The unit has two independent relay contact outputs which can be used for system shut-down and PLC or DCS inputs. Both the relays are energised with voltage present and can be configured for NO or NC contacts. Trip status is indicated by a red LED. Trip point and dead-band can be adjusted by a 15 turn trim pot accessible from the front of the unit. The BHVR272 is powered from the voltage being monitored.