3.312" overall length 3.750" overall width elec ratings, ac, 115v max rated voltage, 10 amp res curr rating at max rated voltage, dc, 30v max rated voltage, 10 amp res voltage; motor 27.5 vdc; 2 terminals for motor/3 for contacts; rated operating time (adjustable) 4-22.5 sec, dial range 4-22.5 sec, w/o progress indicator; dustproof; four mtg holes on 1.750 x 2.812 in. mtg ctrs