Allen-Bradley 1746-P1 SLC 500 Power Supply | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-P1 is a standard AC power supply designed for the SLC 500 modular chassis family. It delivers regulated DC power to the backplane, supporting a wide range of I/O and specialty modules. This page provides full technical specifications, compatible replacement options, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 1746-P1 |
| Series | SLC 500 Modular |
| Input Voltage | 85–265 VAC, 47–63 Hz (universal AC) |
| Output – 5 VDC Bus | 5 VDC @ 5 A |
| Output – 24 VDC User | 24 VDC @ 0.96 A |
| Total Output Power | 25 W (backplane) |
| Compatible Chassis | 1746-A4, 1746-A7, 1746-A10, 1746-A13 |
| Operating Temperature | 0 °C to 60 °C |
| Dimensions (H × W × D) | Occupies 1 slot in SLC 500 chassis |
| Weight | ~900 g |
| Certifications | UL, CE, CSA |
| Country of Origin | USA |
Compatible Replacement & Equivalent Models
When the original 1746-P1 is unavailable or cost-prohibitive, the following models are commonly evaluated as replacements. Always verify electrical ratings and chassis compatibility before substitution.
| Model | Brand | Input | 5 VDC Output | 24 VDC Output | Notes |
|---|---|---|---|---|---|
| 1746-P1 | Allen-Bradley | 85–265 VAC | 5 A | 0.96 A | Original — recommended |
| 1746-P2 | Allen-Bradley | 85–265 VAC | 10 A | 0.96 A | Higher 5 V capacity; drop-in upgrade |
| 1746-P3 | Allen-Bradley | 85–265 VAC | 16 A | 0.96 A | High-density chassis applications |
| 1746-P4 | Allen-Bradley | 24 VDC | 10 A | 0.96 A | DC input variant; different wiring |
| 1746-P5 | Allen-Bradley | 24 VDC | 5 A | 0.96 A | DC input, same capacity as P1 |
| 1746-P6 | Allen-Bradley | 85–265 VAC | 10 A | 1.5 A | Enhanced 24 V user power |
| 1746-P7 | Allen-Bradley | 85–265 VAC | 10 A | 2.88 A | Maximum user power output |
Note: Third-party compatible power supplies may exist. Konmask.com recommends using genuine Allen-Bradley / Rockwell Automation parts for safety-critical applications.
Why Choose the Original Model
- Guaranteed Compatibility: Factory-tested to work with all SLC 500 chassis and processor combinations.
- Firmware & Diagnostics: Full integration with RSLogix 500 fault diagnostics and power-up sequencing.
- Regulatory Compliance: UL 508 / CE marked; meets industrial safety standards out of the box.
- Long-Term Support: Rockwell Automation provides extended lifecycle support and spare parts availability.
- Warranty: Covered under Rockwell Automation’s standard product warranty program.
Typical Applications
- Discrete manufacturing automation (assembly lines, conveyors, packaging)
- Process control panels with moderate I/O counts (4–10 slot chassis)
- HVAC and building automation systems
- Water/wastewater treatment control panels
- Machine tool and press control retrofits
- Legacy SLC 500 system maintenance and spare-parts stocking
System Compatibility
The 1746-P1 is compatible with the following SLC 500 system components:
- Chassis: 1746-A4 (4-slot), 1746-A7 (7-slot), 1746-A10 (10-slot), 1746-A13 (13-slot)
- Processors: 1747-L20, 1747-L30, 1747-L40, 1747-L511, 1747-L514, 1747-L524, 1747-L531, 1747-L532, 1747-L541, 1747-L542, 1747-L543, 1747-L551, 1747-L552, 1747-L553
- I/O Modules: All standard 1746-series digital and analog I/O modules
- Programming Software: RSLogix 500, RSLogix Micro
- Communication: Compatible with DH-485, DeviceNet, and EtherNet/IP adapter modules in the same chassis
⚠ Verify total backplane current draw does not exceed 5 A (5 VDC bus) before finalizing chassis configuration.
Selection Guide
Use the following decision framework to select the correct SLC 500 power supply:
| Requirement | Recommended Model |
|---|---|
| AC input, ≤5 A backplane load, standard 24 V user power | 1746-P1 ✓ |
| AC input, 5–10 A backplane load | 1746-P2 or 1746-P6 |
| AC input, >10 A backplane load (high-density chassis) | 1746-P3 |
| DC input (24 VDC plant power), ≤5 A load | 1746-P5 |
| DC input, 5–10 A load | 1746-P4 |
| AC input, high 24 VDC user power demand (>1 A) | 1746-P6 or 1746-P7 |
How to calculate backplane load: Sum the 5 VDC current draw of all installed modules (listed in each module’s datasheet). Add 10% margin. If total exceeds 5 A, upgrade to 1746-P2 or higher.
Quality Assurance & Sourcing
- Authentic Parts: Konmask.com sources 1746-P1 units from authorized distributors and verified surplus channels.
- Inspection: Each unit undergoes visual inspection and functional verification prior to shipment.
- Traceability: Lot codes and date codes documented on request for MRO and compliance records.
- Packaging: Anti-static packaging with original or equivalent protective materials.
- Lead Time: In-stock units ship within 1–3 business days; sourced units typically 5–10 business days.
How to Order
- Confirm your chassis model and current backplane load calculation.
- Select the correct power supply model from the Selection Guide above.
- Click Add to Cart or contact us for bulk/project pricing.
- Provide your PO number, delivery address, and any special requirements (e.g., date code preference, test report).
- Our team will confirm availability and issue a proforma invoice within 24 hours.
📧 Email: support@konmask.com
📞 Phone/WhatsApp: +0086 19859288691
🌐 Website: https://Konmask.com
Replacement & Compatibility FAQ
Q: Can I replace a 1746-P1 with a 1746-P2 without any configuration changes?
A: Yes. The 1746-P2 is a direct drop-in replacement with higher 5 VDC capacity. No software or wiring changes are required.
Q: Will the 1746-P1 work in a 1746-A13 (13-slot) chassis?
A: It depends on your module configuration. The 13-slot chassis can draw more than 5 A if fully populated. Calculate your backplane load first — if it exceeds 5 A, use the 1746-P2 or P3.
Q: Is the 1746-P1 compatible with SLC 5/05 (Ethernet) processors?
A: Yes. The 1746-P1 powers the backplane regardless of processor type, including the 1747-L551/552/553 (SLC 5/05) series.
Q: Can I use a third-party power supply as a replacement?
A: Third-party units may fit physically, but Konmask.com recommends genuine Allen-Bradley parts for safety-critical or regulated environments to ensure full compliance and warranty coverage.
Q: What happens if the power supply fails?
A: The SLC 500 processor will fault and halt program execution. The 1746-P1 has a built-in fault indicator LED. Replace the unit and perform a controlled restart per your site’s maintenance procedure.
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