Allen‑Bradley 1756‑PA75B ControlLogix AC Power Supply Module

Allen‑Bradley 1756‑PA75B is an AC input rack power supply module for Rockwell ControlLogix chassis. It converts AC mains input into multiple DC rail voltages, providing stable operating power for CPU, communication adapters and various I/O modules installed on the 1756 backplane.

This B‑revision power supply accepts 85‑264V wide‑range AC input and delivers sufficient backplane current for medium‑density I/O configuration. It is equipped with power status LED indicators and built‑in protection circuits, widely deployed as replacement spare part for factory, energy and process automation cabinet maintenance projects.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation)
• Model: 1756‑PA75B
• Product Type: ControlLogix Chassis AC Power Supply Module
• AC Input: 85‑264 VAC, 47‑63Hz universal input
• Backplane Output: Multiple DC rails for 1756 chassis
• Backplane Current Capacity: Suitable for medium‑density I/O racks
• Indicator: Power OK and fault status LED indicators
• Installation: Direct plug‑in to ControlLogix 1756 chassis
• Certification: UL, CE industrial compliance certification
• Operating Temperature Range: 0°C ~ +60°C

Core Functions

• Convert wide‑range AC input into regulated DC power for ControlLogix chassis backplane
• Supply operating power for CPU controllers, communication modules and I/O cards on the rack
• Built‑in over‑voltage, over‑current and short‑circuit protection protects rack‑mounted hardware
• Front‑panel LED quickly displays power normal or fault condition for on‑site troubleshooting
• Direct chassis plug‑in design enables fast installation and spare‑part replacement during maintenance
• Support medium‑density I/O configuration to satisfy most standard automation rack power demands
• Industrial power conversion hardware adapts to temperature fluctuation inside control cabinet environment
• Work as primary rack power source for standard ControlLogix local chassis configuration
• Stable power output reduces abnormal reset risk caused by power fluctuation of automation system
• Provide reliable backplane power foundation for logic operation and field signal acquisition of PLC system

Application Scenarios

• Automotive manufacturing workshop ControlLogix PLC automation control cabinets
• Water supply and sewage treatment plant process monitoring and interlock control racks
• Petrochemical and chemical plant continuous‑production PLC control systems
• Energy plant auxiliary equipment and station automatic control electrical cabinets
• Metallurgy, cement and heavy‑duty machinery sequential control equipment
• Packaging machinery and material handling equipment automation projects
• Automation system upgrade, power‑supply replacement and cabinet reconstruction projects
• ControlLogix chassis maintenance and spare‑parts backup for legacy production facilities
• Rockwell Allen‑Bradley spare‑parts inventory and on‑site maintenance supporting projects