Voltage Band (Window) 
208-240V VWKPU Series
Voltage Band Relays provide protection to equipment that is required to operate
within an upper and lower voltage limit. As long as the operating voltage remains
within an OVER and UNDER voltage range, the internal relay stays energized. If
the operating voltage falls outside this range, the relay will drop-out.
The VWKPU can be
used to monitor any
208, 220 or 240V AC
single phase voltage.
The relay will energize
(pick-up) when the
voltage falls within the
preset OVER trip point
(adjustable 100-125% of
nominal) or UNDER trip point (adjustable 75-100% of nominal) for a period longer
than the pick-up time delay (t1). If the operating voltage falls outside the preset
OVER or UNDER trip points for a period longer than the drop-out time delay (t2),
the relay will de-energize (drop-out). When the voltage returns to normal (within
the preset OVER and UNDER trip points) for a period longer than the pick-up time
delay (t1), the unit automatically resets and the relay energizes. The pick-up time
(t1) and drop-out time (t2) are independantly adjustable.
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