Model 31ZY-0640 31ZY-1280 31ZY-1240 31ZY-2425 31ZY-2450 31ZY-2480 Rated Voltage 6V 12 V 12 V 24 V 24 V 24 V No-load speed 4000 RPM 8000 RPM 4000 RPM 2500 RPM 5000 RPM 8000 RPM No-load current < 180 mA < 350 mA < 110 mA < 80 mA < 100 mA < 200 mA Max. Eff. Power 2.7 W 11.3 W 3.4 W 1.7 W 7.9 W 14.8 W Max. Eff. torque 90 g.cm 190 g.cm 90 g.cm 90 g.cm 160 g.cm 190 g.cm Max. Eff. current < 0.8 A < 1.65 A < 0.55 A < 0.25 A < 0.6 A < 1.