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The 1756-PA72 is standard nonredundant ac chassis power supply for ControlLogix chassis-based control systems. It accepts 85...265 V AC and provides the regulated backplane power rails required by the ControlLogix chassis.
Confirm the ControlLogix chassis, total backplane power demand, input branch circuit, enclosure, and required redundancy strategy. The complete 1756-PA72 marking and nameplate data should be compared with the installed item before a purchase order is released.
Follow the manufacturer instructions and verify branch protection, AC wiring, protective earth, chassis mounting, and backplane power budget. Accessories, connectors, cables, sockets, or terminal blocks must be ordered separately unless the quotation lists them.
85...265 V AC, 47...63 Hz input, 75 W maximum output, with 24 V, 5.1 V, 3.3 V and 1.2 V DC backplane outputs. Use the official ordering information to confirm every suffix, revision, and option that applies to the required unit.
1756-PA72 is a standard AC power supply that mounts on the left side of a compatible 1756 chassis and provides 1.2 V, 3.3 V, 5.1 V and 24 V DC power directly to the backplane. Chassis series determines compatibility. The current Rockwell Automation table lists 1756-PA72/C for 1756-A4, 1756-A7, 1756-A10, 1756-A13 and 1756-A17 chassis Series A, B or C. Match the power-supply series and chassis series before installation.
The 1756-PA72 accepts 120/240 V AC at 50/60 Hz with an input rating of 100 VA / 100 W. It supplies the ControlLogix chassis backplane with up to 2.8 A at 24 V DC, 10.0 A at 5.1 V DC, 4.0 A at 3.3 V DC and 1.5 A at 1.2 V DC. Maximum total output is 75 W and maximum inrush current is 20 A. Calculate the complete installed backplane load and confirm the required branch protection before wiring the power supply.