Allen-Bradley 1756-PA75R ControlLogix AC Redundant Power Supply

The Allen-Bradley 1756-PA75R ControlLogix AC Redundant Power Supply powers ControlLogix backplanes in 1756 chassis with redundancy, delivering a 5V DC output up to 13 A to the system from an AC input. The unit accepts standard industrial AC power and is offered in two AC configurations: 1756-PA75R/A and 1756-PAXTR, with DC variants available as 1756-PB75R/A and 1756-PBXTR for DC input setups. In a typical redundancy arrangement, two supplies feed the same chassis power connector via a passive adapter such as the 1756-PSCA2, providing uptime protection against a single power-supply failure. This PA75R family is documented in Rockwell’s ControlLogix power supplies specifications and installation guides, confirming its role as an upstream power source for the ControlLogix backplane and its compatibility with common 1756 chassis backplanes. Installation guidance also covers configuring dual supplies to maintain system availability in industrial automation environments.