1746-P3 | Allen Bradley | SLC 500 24V DC Chassis Power Supply

Product Overview

The Allen Bradley 1746-P3 provides regulated DC power to the SLC 500 backplane, supporting both the processor and various I/O modules within a 1746 chassis. This module converts a 24V DC nominal input into the specific voltages required for internal logic and field-side communication. Designed for high-availability environments, it fits exclusively into the leftmost slot of any 1746 chassis. We supply this unit as 100% Brand New and Factory Original, ensuring your legacy systems maintain peak electrical stability.

Technical Specifications

Engineering Advantages

• Optimized DC Grid Integration: The 1746-P3 operates on a wide 19.2–28.8V DC range, allowing direct integration into 24V DC battery-backed systems or industrial DC grids. This eliminates the need for AC/DC converters, reducing heat signatures within the enclosure.

• Superior Backplane Support: With a 3.6A capacity at 5V DC, this power supply drives high-density I/O modules and advanced communication processors without voltage sag. It maintains logic integrity even when the chassis reaches maximum module capacity.

• High-Voltage Isolation: The Version B (and later) hardware provides 600V AC RMS isolation. This shield protects sensitive SLC 500 processors from transients and ground loops common in heavy industrial switching environments.

• Thermal Resiliency: The unit operates reliably up to 60 °C. While many power supplies fail under summer peak loads, the 1746-P3 maintains 95% of its current capacity at 55 °C, ensuring continuous uptime in non-climate-controlled cabinets.

• Fail-Safe Protection: An internal 1746-F3 fuse prevents catastrophic failures during overcurrent events. The module's 5ms hold-up time filters out brief voltage dips, preventing nuisance processor trips.

FAQs

• Can I install the 1746-P3 in any slot of the SLC 500 chassis?

  No. The 1746-P3 must occupy the dedicated power supply slot located on the far left side of the 1746 chassis. It features a unique physical form factor that prevents incorrect installation into standard I/O slots.

• What should I consider when operating above 55 °C?

  The 1746-P3 requires a current capacity derating of 5% for every degree above 55 °C. If your cabinet ambient temperature reaches 60 °C, calculate your total backplane load to ensure it does not exceed the derated capacity of 3.42A at 5V DC.

• Is this unit compatible with AC-input SLC 500 systems?

  The 1746-P3 is a DC-input module. While it physically fits the same chassis as the 1746-P1 or P2 (AC units), you must provide a 24V DC source. Ensure your wiring matches the DC polarity requirements to avoid blowing the internal fuse.

• Is this a brand new Allen Bradley original?

  Yes. We guarantee this 1746-P3 is 100% Brand New in its original factory packaging. We do not sell refurbished or "New-Old-Stock" with degraded capacitors; you receive a factory-fresh unit.