75 Watt Chassis Backplane Power | 1756-PA72/C Allen Bradley

Allen Bradley 1756-PA72/C ControlLogix 75W AC Power Supply Module

Product Description

The 1756-PA72 (1756-PA72/C) is a high-performance standard AC power supply engineered for the Allen-Bradley ControlLogix series. This module serves as the primary power source for the ControlLogix backplane, converting universal line voltage into the specific regulated DC potentials required by CPUs, motion modules, and I/O cards. The Series C revision represents a hardware refinement that optimizes thermal management and internal component longevity compared to earlier versions.

Designed for maximum reliability in industrial environments, the 1756-PA72 (1756-PA72/C) includes advanced hold-up time circuitry. This allows the system to remain operational during brief voltage sags and provides a signal to the controller for a graceful system shutdown if power loss is sustained. With a 75-Watt output capacity, it is capable of supporting medium-to-large chassis configurations across global power standards (85–265V AC).

Detailed Technical Specifications

The 1756-PA72/C provides stable power distribution with the following engineering parameters:

• Manufacturer: Allen-Bradley (Rockwell Automation)

• Model/Part Number: 1756-PA72/C

• Series: ControlLogix Power Supplies

• Input Voltage Range: 85–265V AC (Universal)

• Nominal Input Voltage: 120V / 240V AC

• Input Frequency Range: 47–63 Hz

• Maximum Input Power: 100 VA / 100 W

• Maximum Output Power: 75 W @ 0–60 °C (140 °F)

• Current Capacity (1.2V DC): 1.5 A

• Current Capacity (3.3V DC): 4.0 A

• Current Capacity (5.1V DC): 13.0 A @ 40 °C; 10.0 A @ 50 °C; 6.0 A @ 60 °C

• Current Capacity (24V DC): 2.8 A

• Maximum Inrush Current: 20 A

• Isolation Voltage: 250V (continuous), tested at 1500V AC for 60 s

• Hold-up Time: 5 cycles @ 85V AC; 6 cycles @ 120V AC; 25 cycles @ 240V AC

• Mounting: Dedicated left-side slot in any 1756 ControlLogix Chassis

• Weight: 0.95 kg ( 2.1 lbs)