Allen-Bradley 1746-P4 Power Supply Module
Allen-Bradley 1746-P4
SLC 500 Power Supply
120/240V AC Input
Place of Origin:
USA
Brand Name:
Allen-Bradley
Allen-Bradley 1746-P4
,SLC 500 Power Supply
,120/240V AC Input
Allen-Bradley 1746-P4 Power Supply
Designed for SLC 500 modular control systems, the 1746-P4 supplies chassis backplane power and a separate 24V DC user-power output.
Manufacturer Discontinued No Planned Direct ReplacementApplication & System Fit
The 1746-P4 supports power distribution within an existing Allen-Bradley SLC 500 modular control system.
Technical Specifications
| Catalog number | 1746-P4 |
|---|---|
| Product type | SLC 500 rack-mount power supply |
| Nominal input | 120/240V AC |
| Input voltage range | 85–132V AC / 170–250V AC |
| Input frequency | 47–63Hz |
| Typical line power requirement | 150VA |
| Maximum inrush current | 45A |
| 5V DC backplane current | 10.0A |
| 24V DC backplane current | 2.88A |
| 24V DC user-power current | 1.0A |
| User-power voltage range | 20.4–27.6V DC |
| Maximum combined output power | 70W, including user output |
| Mounting location | Left side of the 1746 chassis |
Additional Technical Data
| Dimensions (H × W × D) | 140 × 110 × 145mm |
|---|---|
| Depth | 145mm (5.70in) |
| Ambient operating temperature | 0–60°C; no temperature derating specified for this model in the cited installation instructions |
| Isolation test | 2600V DC for 1 second |
| CPU hold-up time | 20ms at full load; 3000ms at no load |
Installation & Electrical Notes
| Input-voltage selection | Set the input-voltage jumper to match the incoming supply before applying power. |
|---|---|
| Grounding conductor | 14 AWG copper wire; connect the power-supply ground screw to the nearest ground or ground bus. |
| Terminal screw torque | 0.8 N·m (7 lb-in) |
| Chassis mounting torque | Maximum 1.2 N·m (11 lb-in) |
| Installation precautions | Remove power before connecting or disconnecting wiring or installing/removing the supply. Follow the manufacturer's grounding, enclosure and handling instructions. |
| Inductive-load protection | The manufacturer recommends an isolation transformer where inductive switching loads could produce harmful voltage surges. |
Manufacturer Documentation
For model-specific installation and maintenance information, refer to these Rockwell Automation documents:
- Official 1746-P4 product page and lifecycle information
- SLC 500 Power Supplies Installation Instructions — Publication 1746-IN004
Search the exact catalog number together with “1746-P4 manual PDF” to identify the appropriate product documentation.
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Frequently Asked Questions
1. What input voltage does the 1746-P4 support?
It supports nominal 120V or 240V AC input. The input-voltage selection must match the supply being used.
2. What are the 1746-P4 output current ratings?
The rated outputs are 10A at 5V DC and 2.88A at 24V DC for the backplane, plus 1A at 24V DC for user power.
3. Is the Allen-Bradley 1746-P4 discontinued?
Yes. Rockwell Automation lists the product as discontinued effective September 30, 2024.
4. Is there an official replacement for the 1746-P4?
The manufacturer lists no planned direct replacement. Verify the complete chassis and power requirements before selecting another model.
5. Where can I find the 1746-P4 installation manual?
Look for Rockwell Automation publication 1746-IN004, SLC 500 Power Supplies Installation Instructions, using the exact publication number.
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