DC Voltage or Current Protection Relays

DC current protection relays continuously monitor DC currents (either directly or through a current shunt) and DC voltage protection relays continuously monitor DC voltages, tripping upon fault condition. The output relay trips when the monitored current or voltage is outside of the user adjustable limit and the LED illuminates indicating a fault condition. The trip point on the current model is adjustable from 20% to 120% and the voltage model 70% to 130% of the nominal rating through the front control knob. The output relay is set to de-energise in the under condition ensuring the protection relays are failsafe. The voltage relay is self powered while the current relay requires an auxiliary power supply. The current protection relays are available with either a single or double pole changeover relay output and optional built-in time delay.

Key Terms: B846-A - B846-B - F187/O - F187/U - TA846 - DC Voltage - DC Current - Protection Relay