Protek Failsafe Battery Pack Series 92 Protek Battery Pack Applications:Locations requiring both an electric actuator and a power-loss open/close backup. Size:S92, A92, B92, C92 Torque:400 in/lbs – 2000 in/lbs Voltage:120 VAC, 1-phase, 50/60Hz Series 94 Protek Battery Pack Applications:Locations requiring both an electric actuator and a power-loss open/close backup. Size:A94, B94 Torque:150 in/lbs – 300 in/lbs Voltage:120 VAC, 1-phase, 50/60Hz