1746-P3 is a rack-mount power supply for the Allen‑Bradley SLC 500 modular PLC chassis, manufactured by Rockwell Automation. Unlike the AC-input 1746-P1 and 1746-P2 variants, this model accepts a 24 VDC field power source and converts it to regulated +5 VDC and auxiliary +24 VDC for the SLC backplane, feeding the processor and all I/O modules installed within the rack. It is widely specified for control cabinets where a plant-wide 24 VDC distribution system is already available, eliminating the need for an upstream AC-DC converter for the SLC chassis.

This power supply installs in the dedicated leftmost power slot of a standard SLC 500 chassis and provides continuous backplane power while monitoring internal voltage rails. Front panel status LEDs indicate normal operation and fault conditions to simplify on-site troubleshooting. Integrated overvoltage, overcurrent and short-circuit protection safeguard the SLC processor and connected I/O cards against field wiring faults. Rockwell marked the 1746-P3 as discontinued with the last sale date September 30, 2024; there is no direct factory replacement, making verified pre-tested spare units critical for plants maintaining legacy SLC automation racks.

We supply inspected and functionally validated 1746-P3 stock, including new old stock and tested surplus. Each unit undergoes load testing, output rail verification, LED and protection circuit checks before dispatch, ready for direct drop-in replacement during shutdown maintenance and spare part stocking.

Key Features

Allen‑Bradley 1746-P3, dedicated 24 VDC input power supply for SLC 500 chassis Input range: 19.2 VDC to 28.8 VDC, compatible with standard industrial 24 VDC power networks Backplane output: 3.6 A at +5 VDC, 0.87 A auxiliary +24 VDC Rack-mount design, occupies the dedicated power slot of SLC 500 modular chassis Status LED indicators for power OK and fault alarm Built-in overcurrent, short-circuit and overvoltage protection Supports full SLC 500 processor range including 5/01, 5/02, 5/03, 5/04 and 5/05 Works with digital, analog, RTD and specialty SLC I/O modules Removable screw terminal block for field 24 VDC wiring ISA-S71.04 G3 industrial environmental rating UL, CSA and CE certified Discontinued end-of-life spare, no direct Rockwell drop-in replacement Optimised for cabinets with existing 24 VDC plant power infrastructure

Product Specifications

Part number: 1746-P3 Manufacturer: Allen‑Bradley / Rockwell Automation Platform: SLC 500 PLC Product type: Chassis power supply Input voltage: 19.2–28.8 VDC +5 VDC backplane output: 3.6 A Auxiliary 24 VDC output: 0.87 A Typical power draw: 90 VA Mounting: Left power slot of SLC 500 modular chassis Operating temperature: 0 °C to +60 °C Humidity: 5%–95%, non-condensing Status indicators: Power OK, fault LED Protection: Electronic overcurrent, short-circuit, overvoltage Termination: Screw terminal block Lifecycle status: Discontinued, last sale Sep 30, 2024 Certifications: UL, CSA, CE

Typical Applications

SLC 500 racks in 24 VDC centralised control cabinets Water and wastewater treatment legacy control panels Chemical plant and refinery SLC system spare replacement Packaging, material handling and conveyor automation Power station auxiliary control and boiler auxiliary racks Food & beverage thermal and batch process control Mining and heavy industry remote control skids Field control cabinets powered by 24 VDC UPS systems Legacy SLC maintenance outage and spare inventory build-up

Why Choose Our 1746-P3 Power Supply

We focus on hard-to-source discontinued Rockwell SLC 500 spares for plant maintenance teams, system integrators and automation contractors. Since there is no direct factory equivalent for the 1746-P3, power supply failure can shut down an entire SLC rack. Every unit is load-tested to confirm stable 5 VDC backplane delivery and protection circuit functionality before shipment.

We consolidate shipments with matching SLC chassis, processors, digital and analog I/O such as 1746-OA16, 1746-NR8 and other SLC modules. Commercial invoices, packing lists and optional test reports are available. Tiered pricing and long-term plant spare frame agreements are supported for bulk procurement. Submit your complete part list and target lead time for a formal quotation.

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FAQ

What is the difference between 1746-P3 and 1746-P1 / 1746-P2? 1746-P1 and 1746-P2 accept AC mains input. 1746-P3 is a DC-only power supply for 19.2–28.8 VDC input, with its own unique current rating. They are not interchangeable without cabinet wiring redesign.

Can 1746-P3 run a full 10-slot SLC chassis? It depends on the total backplane current consumption of your CPU and I/O modules. Always sum the 5 VDC load of all installed modules; 1746-P3 provides up to 3.6 A on the 5 V rail.

Is there a direct replacement for 1746-P3 from Rockwell? No. Rockwell has not released a pin-for-pin direct replacement. System migration generally moves toward CompactLogix and Compact 5000 I/O, which requires full panel re-engineering.

Does the auxiliary 24 VDC output power field sensors? The 0.87 A auxiliary rail is intended for low-current system use. For large sensor loads, use a separate dedicated 24 VDC field power supply.

Is this compatible with SLC 5/05 Ethernet processors? Yes, the 1746-P3 works with all standard modular SLC 500 processors, including the SLC 5/05.

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1746-P3