Electronic time relay RSTB

sequenceDIN rail mounted

This is designed to monitor 3-phase supplies and to protect motors and other loads against the faults listed below. - Monitoring of rotational direction of phases - Detection of complete failure of one or more of the phases - Undervoltage detection (-10%) - Overvoltage detection (+10%) - Detection of phase asymmetry (imbalance) (±10%) The relay operates if any of the conditions occours. The relay releases if any of the conditions fails. There is a Time Delay between the relay action and the condition occours (except rotational direction of phases error) to avoid very short interruptions or other momentary failures. A selector switch allows selection of an adjustable time delay from 0.1 s to 10 s. When the supply returns towards its rated value, the relay is re-energised according to the hysteresis value (5%)