Inrush Restraint Summary

Inrush Restraint helps to prevent the ACR from tripping unnecessarily due to short lived inrush current such as magnetizing current associated with energizing a transformer.

Pickup and Max Current events are still logged according to the Fault Detect setting for each element even though the Inrush Multiplier is being applied.

Inrush Restraint affects Phase, Earth, and NPS protection but does not apply to Definite Time or SEF protection.

Inrush Restraint is triggered by currents going from zero to non-zero. So if normal load currents are expected to drop below 2.5 A Inrush cannot be used and must be left off.