Allen-Bradley 1746-P4 Power Supply Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1746-P4 is a high-capacity power supply module designed for the SLC 500 programmable logic controller (PLC) platform by Rockwell Automation. It delivers regulated DC power to the SLC 500 chassis backplane, supporting demanding industrial automation environments. 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-P4 |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Series | SLC 500 |
| Input Voltage | 85–265 VAC, 47–63 Hz (universal input) |
| Output – 5 VDC | 10 A |
| Output – 24 VDC | 0.96 A |
| Total Output Power | 75 W |
| Chassis Compatibility | SLC 500 modular chassis (1746-Axx series) |
| Operating Temperature | 0 °C to 60 °C |
| Storage Temperature | -40 °C to 85 °C |
| Relative Humidity | 5–95% non-condensing |
| Weight | Approx. 250 g |
| Certifications | UL 508, CE, CSA |
| Reference Publication | Rockwell 1746-IN009 |
Compatible Replacement & Equivalent Models
When the original 1746-P4 is unavailable or cost-prohibitive, the following models are commonly evaluated as replacements. Always verify electrical ratings and chassis compatibility before substitution.
| Model | Manufacturer | Input Voltage | 5 VDC Output | Notes |
|---|---|---|---|---|
| 1746-P4 (OEM) | Allen-Bradley | 85–265 VAC | 10 A | Original — highest compatibility |
| 1746-P3 | Allen-Bradley | 85–265 VAC | 5 A | Lower capacity; suitable for smaller chassis loads |
| 1746-P5 | Allen-Bradley | 85–265 VAC | 10 A | Higher output variant; verify chassis slot clearance |
| 1746-P6 | Allen-Bradley | 85–265 VAC | 10 A | Extended power; for high-load multi-module configurations |
| Third-party compatible | Various OEM | 85–265 VAC | 10 A | Verify UL/CE listing and backplane pinout before use |
⚠ Note: Third-party replacements must match backplane connector pinout, output ripple specifications, and protection features. Konmask.com supplies verified-source units only.
Why Choose the Original 1746-P4
- Full OEM compatibility — guaranteed fit with all SLC 500 chassis variants (1746-A4, A7, A10, A13)
- Rockwell firmware recognition — no configuration workarounds or driver patches required
- Proven MTBF — field-validated reliability in 24/7 continuous industrial environments
- Warranty & support eligibility — qualifies for Rockwell TechConnect support contracts
- Regulatory compliance — UL 508, CE, and CSA certified out of the box
- Drop-in replacement — no re-programming or chassis modification needed
Typical Applications
- Automotive assembly line control panels
- Food & beverage processing and packaging machinery
- Water treatment and pump station automation
- HVAC and building management systems
- Material handling, conveyor, and sortation systems
- Oil & gas field instrumentation and wellhead panels
- Retrofit and upgrade of legacy SLC 500 installations
- Batch process control in chemical and pharmaceutical plants
System Compatibility
The 1746-P4 is designed exclusively for the Allen-Bradley SLC 500 modular chassis family. It occupies the dedicated power supply slot (slot 0) and is not interchangeable with MicroLogix, ControlLogix, or CompactLogix platforms. Confirm your chassis catalog number before ordering:
- 1746-A4 (4-slot chassis) ✔
- 1746-A7 (7-slot chassis) ✔
- 1746-A10 (10-slot chassis) ✔
- 1746-A13 (13-slot chassis) ✔
- 1747-Lxx SLC 5/01–5/05 processors ✔ (when paired with above chassis)
Not compatible with: MicroLogix 1000/1100/1400, ControlLogix 1756-series, CompactLogix 1769-series.
Selection Guide
Use the following decision criteria to select the correct SLC 500 power supply for your application:
- Step 1 — Calculate total backplane current draw: Sum the 5 VDC and 24 VDC requirements of all installed I/O and processor modules (refer to each module’s data sheet).
- Step 2 — Apply a 20–25% derating margin for thermal headroom and future I/O expansion.
- Step 3 — Match input voltage: Confirm site supply is within 85–265 VAC range (1746-P4 is universal input — no tap selection required).
- Step 4 — Verify chassis slot: Power supply must occupy slot 0 of the chassis; no other module can share this position.
- Step 5 — Check certifications: Ensure UL/CE/CSA compliance matches your regional installation code requirements.
If your calculated load exceeds 10 A at 5 VDC, consider the 1746-P6 or a dual-chassis architecture with a second power supply.
Quality Assurance & Sourcing
- Verified supply chain — units sourced from authorized distributors and certified secondary-market suppliers with full traceability
- Inspection protocol — each unit undergoes visual inspection, functional power-on test, and label-authenticity verification before shipment
- Traceability — lot numbers and date codes documented; available on request for audit purposes
- Packaging — ESD-safe anti-static bags with original or equivalent protective foam packaging
- Warranty — 12-month replacement warranty on all units shipped by Konmask.com
- Export compliance — ECCN and HTS classification available for international shipments
How to Order
- Confirm your chassis model (1746-Axx) and calculate total module current load.
- Add the 1746-P4 to your cart, or contact us for bulk/project pricing and lead-time confirmation.
- Provide your shipping address and preferred freight method at checkout.
- For urgent or large-quantity requirements, email support@konmask.com with your project timeline and quantity.
- Lead time: typically 1–5 business days for in-stock units; expedited options available on request.
Replacement & Compatibility FAQ
Q: Can I use the 1746-P4 in a 1746-A13 (13-slot) chassis?
A: Yes. The 1746-P4 supports all standard SLC 500 modular chassis. Verify that total module current draw does not exceed 10 A at 5 VDC before installation.
Q: Is the 1746-P4 a direct replacement for the 1746-P3?
A: The 1746-P4 is a higher-capacity upgrade (10 A vs. 5 A at 5 VDC). It is physically and electrically compatible — a safe upgrade path with additional headroom.
Q: Can third-party power supplies replace the 1746-P4?
A: Electrically compatible units exist, but Rockwell Automation does not officially support third-party power supplies. Use OEM units for warranty-covered and safety-critical applications.
Q: What happens if the power supply is undersized?
A: The processor may fault, I/O modules may behave erratically, or the supply may enter thermal shutdown. Always size with a 20–25% derating margin.
Q: Do you supply new, refurbished, or surplus units?
A: Konmask.com supplies new and verified-surplus units. Condition is clearly stated on each listing. Contact us if you require factory-new units with full Rockwell documentation.
Q: Can I use the 1746-P4 with a 24 VDC input supply?
A: No. The 1746-P4 requires AC input (85–265 VAC). For DC-input applications, refer to the 1746-P7 (24 VDC input variant).
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