The residual current is monitored by the P632 with three-stage functions to detect when it exceeds the set thresholds. One of two different threshold types can be active. The “dynamic” thresholds are active for the set hold time for the “dynamic parameters” (see Chapter “Activation of “Dynamic Parameters””) and the “normal” thresholds are active when no hold time is running. If the residual current exceeds the set thresholds, timer stages are started. Once the time delays have elapsed, a signal is issued. If the operating mode of the general starting decision is set to With start. IN/Ineg, a trip signal is issued as well. The timer stages can be blocked by appropriately configured binary signal inputs. In addition these timer stages can also be automatically blocked by single-pole or multipole starting (depending on the setting).