Belimo came with a new actuator (Belimo AFBUP) which has same torque rating as the previous AF-24 and AF-120. This would works across 24V to 240V AC or DC power supply. This takes away any error in ordering, and specifying. This is a universal actuator which shall meet most HVAC systems needs. It has power running time of 75 seconds and spring operation time of leas than 20 seconds. For faster acting application, we need to look at other actuators.