Allen-Bradley 1756-PA72 AC Power Supply Module

Allen-Bradley 1756-PA72 AC Power Supply Module powers the ControlLogix chassis backplane with a robust, standard AC input solution. It accepts 85–265 VAC (50/60 Hz) and delivers up to 75 W of DC power to the backplane, including 5 VDC at up to 10 A and 24 VDC up to 2.8 A for I/O backplane support, with additional rails for 1.2 V and 3.3 V as required by the ControlLogix backplane. The unit measures 140 x 112 x 145 mm (5.5 x 4.4 x 5.7 in) and weighs about 1.1 kg (roughly 2.5 lb), and mounts on the left side of the 1756 chassis. This makes the PA72 a standard choice for ControlLogix deployments in applications such as packaging lines, conveyors, and assembly stations that rely on reliable, cabinet-grade power to the rack. The PA72 family also includes variants like PA72K (conformally coated) for harsher environments, designed to provide stable backplane power across typical industrial mains conditions.