Grässlin’s GM40 Series 40 amp auto-voltage time switch is a universal electromechanical control, which automatically detects the input voltage without the use of a DIP switch or selector pins. The time switch automatically selects any voltage between 120 VAC and 277 VAC. The time switch controls high amperage loads for lighting, HVACR, pumps, motors, fan controls, access controls, agricultural facilities and general purpose electrical circuits. Power and status LED indicators. 24-Hour timer / Skip-a-Day / 7-Day programming. Captive trippers – trippers cannot be lost. Auto-voltage selection 120 VAC through 277 VAC. Up to 48 ON/OFF operations per 24 hour period or 42 ON/OFF operations per week on W models. DPDT Switching Configuration standard (2 N.O. and 2 N.C. Contacts). Manual 3-way OFF/AUTO/ON override switch. 7 Day Carry-over on Q models.