The VBA Series offers protection
to single phase equipment that is
required to operate between two
Supply voltage is monitored for a
preselected UNDER and OVER voltage
With normal operating voltage applied,
the internal relay will energize
When the voltage falls outside the
preset Over/Under trip points for
longer than the release delay, the relay will de-energize (DROPOUT).
When line conditions return to normal, the VBA Series automatically
resets and the internal relay energizes. The HYSTERESIS
in each unit on the Under and Over limits provides a differential
between the PICK-UP and DROP-OUT trip points.