The P632 checks the voltage to determine whether it exceeds or falls below a set threshold. The triggers are followed by timer stages that can be blocked via appropriately configured binary signal inputs.

If undervoltage monitoring decisions are to be included in the trip commands, then it is recommended that transient signals be used. Otherwise the trip command would always be present when the system voltage was disconnected, and it would therefore not be possible to close the circuit breaker again.

Furthermore, time-voltage protection provides a time-window for each timer stage. The windows are defined by the setting V<>: Vmin> PSx as lower threshold for both timer stages and by the set operate value V< or V<< of the relevant timer stage and parameter subset as upper threshold. With an appropriate setting of the successive timer stages, this provision can be used to bridge short periods of voltage failure as encountered in switching operations.