The residual current is monitored by the P632 to detect when it exceeds the set thresholds. Alternatively, two different thresholds can be active. The “dynamic” threshold is active for the set hold time for the “dynamic parameters” (see Chapter “Activation of “Dynamic Parameters””) and the “normal” threshold is active when no hold time is running. The IDMT protection will trigger when the 1.05-fold of the set reference current value is exceeded by the residual current. Dependent on the characteristic selected and the residual current magnitude the P632 will determine the tripping time. Moreover the tripping time will under no circumstances fall below a settable minimum time threshold irrespective of the residual current flow magnitude.

The inverse-time stage can be blocked by an appropriately configured binary signal input. In addition the inverse-time stage can also be automatically blocked by singlepole or multi-pole starting (depending on the setting).