Overview
The Allen-Bradley 1746-P4 is an SLC 500 rack-mounted power supply module designed to provide stable, regulated power to processor and I/O modules in industrial control chassis. This unit accepts 120/240VAC input (85–132V or 170–265V AC, 47–63 Hz) and supplies dual regulated outputs: 10A maximum at 5.1VDC and 2.88A maximum at 24VDC, with 1A user-accessible output. Built-in fuse protection and hold-up time specifications ensure safe operation during brief power interruptions.
Key Features
- Dual regulated DC outputs: 5.1VDC and 24VDC for processor and I/O power
- Wide input range: 85–132VAC / 170–265VAC, 47–63 Hz
- Maximum output ratings: 10A @ 5.1VDC, 2.88A @ 24VDC
- Hold-up time: 20 ms at full load, 3000 ms at no load
- Open-style rack mount form factor for compact SLC 500 chassis integration
- Status LED indicators for operational monitoring
- UL Listed and CSA Certified for Class 1, Div 2 hazardous locations
Technical Specifications
Detailed electrical and physical performance data:
- Input Voltage: 85–132VAC @ 50Hz; 170–265VAC @ 60Hz (dual setting)
- Frequency: 47–63 Hz
- Output – 5V Channel: 10.0A maximum at 5.1VDC
- Output – 24V Channel: 2.88A maximum at 24VDC, 1A user-accessible
- Power Rating: 150VA total, 70W continuous
- Hold-up Time: 20 ms (full load), 3000 ms (no load)
- Maximum Inrush Current: 45A
- Operating Temperature: 0–60°C
- Output Voltage Nominal: 20.4V (per Crawford/NorthEast specs)
- Mounting Style: Rack mount (no chassis enclosure)
- Weight: 2.45 lbs (approx.)
- Certifications: UL Listed, CSA Certified, GOST, KC, MARINE compliance
Typical Applications
The 1746-P4 is widely used in:
- Local SLC 500 chassis backplane power distribution
- Remote I/O module installations with power consolidation
- Expansion chassis in multi-rack control systems
- Industrial automation facilities requiring dual-output regulation
- Class 1, Div 2 hazardous-location control panels (pharmaceutical, chemical, food processing)
- Legacy equipment maintenance and system upgrades where SLC 500 platform is deployed
Compatibility & Replacements
Compatible With
- SLC 500 modular chassis (local and expansion)
- SLC 500 processor modules (1747-L511, 1747-L512, 1747-L541, 1747-L543, 1747-L551)
- 1746 series I/O modules (digital, analog, specialty)
- Remote I/O adapter and remote I/O chassis
- Rockwell Automation RSLogix 500 programming software environments
Replaces / Drop-In Replacement For
- 1746-P2 (requires verification of load requirements; consult application current calculations)
- Earlier 1746 power supply variants when current capacity and voltage ratings match
- Verify compatibility with your system integrator before ordering—different -P series units have differing amperage and power outputs.
Works With
- RSLogix 500 and Studio 5000 / CompactLogix environments (for mixed legacy/modern systems)
- Hardwired control circuits using 24VDC logic
- Third-party 5VDC and 24VDC peripheral modules and sensor interfaces
- No network protocol dependencies; operates as a standalone passive power module
