Further information for ABB E236-US1.1D - Undervoltage relay
If the measured voltage of all phases
exceeds the switching threshold Us including hysteresis, the time delay (t) starts and the green LED U/t flashes. After the delay
time (t) has elapsed, the output relay R is energized (yellow LED lights up, green LED U/t flashes). If the
measured voltage of one of the connected phases falls below the switching threshold Us,
the output relay is no longer energized (yellow LED goes out, green LED U/t goes out).