This is the scheduled clock time (HH:MM) on Saturday at which load bank 3 disconnects as part of the plant's time-of-day load-shed schedule, independent of the voltage- and temperature-based disconnects for that bank, per the description. Because bank 3 typically carries the site's most essential load, its schedule for this day is usually configured to shed for the shortest window of the three banks, if it is shed on a time schedule at all. Having a separate setpoint for every individual day rather than one blanket daily time lets the site follow a non-uniform weekly shed pattern, such as demand-charge avoidance windows that differ between weekdays and weekends. A value of '21:00' would shed load bank 3 every Saturday at that time, reconnecting later per the matching reconnect3LoadShedSaturdayOn setpoint.