The Allen-Bradley 1756-PB75R is a ControlLogix DC redundant power supply that provides the 5V logic power required by the chassis backplane and its modules. It accepts 19–32 VDC input (nominal 24 V) and delivers 5 V DC at up to 13 A (75 W total), with an input current of about 2.80 A on 24 V, designed for use in a hot-swappable redundant pair powering a single ControlLogix chassis. In typical ControlLogix redundancy configurations, two identical PB75R units are used to maintain uninterrupted operation, with related variants including the conformally coated 1756-PB75RK and revisions such as 1756-PB75R/A.
