Over/Under Voltage Relays provide protection to equipment where an over or under voltage condition is potentially damaging. They are designed to energize when the operating voltage reaches a preset value and drop-out when the operating voltage drops to a level below the preset value.
The pick-up voltage setting (Umax) is user-adjustable across the full range as shown in the table below. The VMP Series has a drop-out voltage setting (Umin) fixed at 95% of the pick-up voltage setting (an adjustable drop-out setting of 75- 95% of the pick-up setting is available on the VAKP Series). The relay energizes (and the LED is Red) when the monitored voltage is above the pick-up setting for a period longer than the fixed pick-up time delay of 0.5 seconds. The relay de-energizes (and the LED is Green) when the monitored voltage is below the drop-out setting for a period longer than the drop-out time delay (t), which is fixed at 0.5 seconds.
Features