Rockwell / Allen-Bradley 1746-P4 SLC 500 Power Supply

The Rockwell / Allen-Bradley 1746-P4 is a power supply module for SLC 500 programmable logic controller systems. It converts AC line power to regulated DC outputs that energize the SLC 500 backplane, enabling processor and I/O module operation. Designed for Class 1, Division 2 hazardous locations, this chassis-mount unit delivers stable power in industrial control environments and supports interconnection of up to three modular chassis.

Technical Specifications

• Input voltage: 85–132V AC or 170–265V AC, 47–63 Hz (jumper-selectable)


• Input frequency: 47–63 Hz


• Typical line power requirement: 150 VA


• Maximum inrush current: 45 A


• Total output power: 70 W maximum


• Backplane output: 5.1 VDC at 10.0 A, plus 24 VDC at 2.88 A


• User power output: 1.0 A at 24 VDC (20.4–27.6V DC range)


• Maximum user-supplied overcurrent protection: 15 A


• CPU hold-up time: 20 ms at full load; 3000 ms at no load


• Input-to-backplane isolation: 2600V DC for 1 second


• Fuse protection: Soldered-in, non-replaceable internal fuse Environmental & Physical


• Operating temperature: 0°C to 60°C (no derating)


• Storage temperature: −40°C to 85°C


• Relative humidity: 5% to 95%, non-condensing


• Altitude: Up to 2000 m above sea level


• Pollution degree: 2


• Dimensions: 140 mm H × 110 mm W × 145 mm D


• Weight: 1.4 kg

Key Features

• Dual-range AC input with jumper selection for 120V or 240V operation


• solid isolation rating for industrial noise immunity


• Integrated backplane and auxiliary power delivery in single module


• Non-replaceable fused design minimizes maintenance points


• Compact form factor fits standard SLC 500 chassis slots

Compatibility & Integration Designed specifically for SLC 500 modular chassis architecture. Supports interconnection of up to three chassis in distributed control configurations. UL Listed and CSA Certified for Class 1, Division 2, Groups A, B, C, D hazardous locations. CE Marked and C-Tick compliant. Lifecycle status: Discontinued as of September 30, 2024.