Allen-Bradley 1746-P3 – SLC 500 Rack Mounting Power Supply | Rockwell Automation SLC Platform
Engineering Background
The Allen-Bradley 1746-P3 is a rack-mounted power supply module designed specifically for the SLC 500 modular chassis family. Engineered by Rockwell Automation, it delivers regulated DC power to the SLC 500 backplane, supporting mixed I/O configurations in demanding industrial environments. The 1746-P3 is the preferred choice for applications requiring a wide-range AC input with higher current capacity on the 24 VDC user power bus.
Product Positioning
Targeted at procurement engineers and MRO buyers maintaining legacy SLC 500 control systems, the 1746-P3 provides a direct OEM-equivalent replacement without requiring chassis or program modifications. Konmask.com supplies verified surplus and new-surplus units with full traceability documentation, enabling rapid line restoration and planned maintenance cycles.
Complete Technical Specifications
| Parameter | Specification |
|---|---|
| Catalog Number | 1746-P3 |
| Series | SLC 500 Modular (1746 Chassis) |
| Input Voltage (AC) | 85–265 VAC, 47–63 Hz (universal range) |
| Input Current | 3.0 A max @ 120 VAC / 1.5 A max @ 240 VAC |
| Output – Backplane +5 VDC | 5 A continuous |
| Output – User Power +24 VDC | 0.96 A continuous |
| Output – User Power –5 VDC | 0.5 A continuous |
| Output – User Power +24 VDC (aux) | Shared with user power bus |
| Power Dissipation | ≤ 30 W typical |
| Operating Temperature | 0 °C to +60 °C (32 °F to 140 °F) |
| Storage Temperature | –40 °C to +85 °C |
| Relative Humidity | 5–95% non-condensing |
| Chassis Compatibility | 1746-A4, A7, A10, A13 (all SLC 500 modular chassis) |
| Slot Occupancy | Leftmost slot (dedicated power supply slot) |
| Certifications | UL Listed, CE Marked, CSA Certified |
| Weight | Approx. 800 g |
| Dimensions (H × W × D) | Per SLC 500 chassis form factor |
Proven Application Environments
- Discrete Manufacturing: Automotive assembly lines, stamping presses, and conveyor control panels running SLC 5/03, 5/04, or 5/05 processors.
- Food & Beverage: Packaging machinery and filling lines where wide-range AC input accommodates variable plant power quality.
- Water & Wastewater: Pump station and SCADA remote I/O panels requiring reliable 24 VDC user power for field transmitters.
- Oil & Gas: Wellhead and pipeline control panels in Class I, Division 2 enclosures (with appropriate barrier wiring).
- Building Automation: Legacy HVAC and chiller plant controllers scheduled for extended service life.
- MRO / Emergency Replacement: Direct swap for failed 1746-P2 or 1746-P3 units to minimize unplanned downtime.
Engineering Advantages
- Universal AC Input: 85–265 VAC range eliminates the need for external step-down transformers in 220/240 VAC facilities.
- Higher 24 VDC User Power: 0.96 A on the user power bus supports more field devices (sensors, solenoids) compared to the 1746-P2 (0.46 A).
- Backplane Protection: Built-in over-current and over-voltage protection prevents cascade failures across I/O modules.
- Hot-swap Compatible Chassis: When used with appropriate chassis, allows module replacement without full system shutdown.
- Proven Longevity: MTBF data supports multi-decade service life in controlled environments, reducing total cost of ownership.
- Drop-in Replacement: Identical form factor and connector pinout to all 1746-P series supplies — no wiring changes required.
System Architecture & Signal Flow
The 1746-P3 occupies the dedicated power supply slot at the far left of any SLC 500 modular chassis. AC mains connect to the terminal block on the module face. The internal switching regulator converts AC input to regulated +5 VDC (backplane logic power) and +24 VDC / –5 VDC (user power bus). The backplane distributes +5 VDC to the processor and all I/O modules. The user power bus is accessible via the chassis backplane connector and the front-panel user power terminals, providing 24 VDC for field device excitation. A status LED on the front panel indicates power-good state; loss of LED indicates input undervoltage, overload, or internal fault.
AC Mains (85–265 VAC)
│
▼
[1746-P3 Switching Regulator]
├──► +5 VDC Backplane Bus ──► SLC Processor + All I/O Modules
├──► +24 VDC User Power ──► Field Sensors / Solenoids
└──► –5 VDC User Power ──► Analog I/O Reference
Sourcing & Quality Verification
All 1746-P3 units supplied by Konmask.com undergo the following verification process before shipment:
- Visual Inspection: Housing integrity, label legibility, connector pin condition, and absence of burn marks or corrosion.
- Functional Power-On Test: Output voltage verification on all rails under representative load.
- Firmware / Revision Check: Series letter and date code recorded and disclosed in the shipment documentation.
- ESD-Safe Packaging: Anti-static bag + foam insert + double-wall carton for international transit.
- Traceability Documentation: Test report and inspection checklist included with each unit on request.
Procurement Process
- Confirm Quantity & Revision: Contact us with your required quantity and any series/revision preference.
- Receive Quotation: We respond within 1 business day with price, lead time, and stock confirmation.
- Place Order: Secure checkout via Konmask.com or by proforma invoice for B2B accounts.
- Inspection & Dispatch: Units are tested, documented, and dispatched within 1–3 business days.
- Delivery: DHL / FedEx / UPS express options available; estimated 3–7 business days to most destinations.
- After-Sales Support: 30-day return window for DOA units; technical support available via email and phone.
Technical FAQ
- Q: Is the 1746-P3 compatible with the SLC 5/05 Ethernet processor?
- A: Yes. The 1746-P3 is compatible with all SLC 500 processors (5/01 through 5/05) in any 1746 modular chassis.
- Q: Can the 1746-P3 replace a 1746-P2?
- A: Yes, it is a direct form-fit-function replacement. The P3 provides higher 24 VDC user power (0.96 A vs. 0.46 A), which is always backward compatible.
- Q: What happens if the user power bus is overloaded?
- A: The supply enters current-limit mode and may shut down to protect the backplane. Remove excess field device load and cycle AC power to restore operation.
- Q: Do you supply units with a warranty?
- A: All units carry a 30-day DOA guarantee. Extended warranty options are available for volume orders — contact us for details.
- Q: Can I order a single unit?
- A: Yes. Konmask.com accepts single-unit orders with no minimum order quantity.
- Q: What documentation is available?
- A: We can provide the Rockwell Automation publication 1746-UM005 (SLC 500 Modular Hardware Style User Manual) reference and our internal inspection report upon request.
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