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 VAKP Series has an adjustable drop-out voltage setting (Umin) of 75-95% of the pick-up setting (a fixed drop-out voltage setting of 95% of the pick-up setting is available on the VMP 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 deenergizes (and the LED is Green) when the monitored voltage is below the dropout setting for a period longer than the drop-out time delay (t), which is adjustable from 0.1-10 seconds.
Features