1768-PA3 | Allen-Bradley | CompactLogix 120/220V AC Power Supply Module

Product Overview

The 1768-PA3 provides stable, regulated power to Allen-Bradley CompactLogix 1768 controller systems and adjacent I/O modules. This high-capacity power supply converts wide-range AC or DC input voltages into the specific backplane levels required for processor logic and communication. We supply this unit in 100% Brand New condition, ensuring maximum MTBF (Mean Time Between Failure) for critical control architectures that demand uninterrupted power delivery.

Technical Specifications

Engineering Advantages

• Universal Voltage Flexibility: The 1768-PA3 accepts a broad input range from 85V to 265V AC. This eliminates the need for localized transformers, allowing engineers to deploy the same control panel design across global regions with varying power grids.

• High-Shock Resilience: Rated for 30g operating shock, this module withstands the mechanical stresses of heavy industrial environments. It maintains power integrity in applications involving stamping presses, reciprocating machinery, or mobile equipment platforms.

• Efficient Thermal Management: The open-style enclosure optimizes convective cooling. By maintaining a 75% typical efficiency, the module minimizes internal heat buildup, which protects sensitive electronic components in high-density DIN-rail configurations.

• Simplified Field Wiring: The Category 1 power ports utilize robust screw terminals designed for 0.6 Nm torque. This secure connection prevents terminal loosening caused by industrial vibration, ensuring a low-impedance path for input power.

FAQs

Can I use the 1768-PA3 with standard 1769-L3x controllers?

No. The 1768-PA3 specifically fits the 1768-L43 and 1768-L45 controllers. While both belong to the CompactLogix family, the 1768 series uses a different physical and electrical backplane architecture than the standard 1769 series.

Does this power supply support DC input?

Yes. Although primarily labeled for AC, the 1768-PA3 operates on 108–132V DC input. This versatility allows for integration into battery-backed systems or DC microgrids common in utility and substation environments.

What should I do if the internal fuse blows?

The 1768-PA3 utilizes a soldered, non-replaceable fuse for maximum safety. If the fuse clears, it indicates a significant internal hardware failure or an external surge. You must replace the entire module to ensure the safety and certification of the PLC system.

How many 1768-PA3 modules can I install in one system?

A 1768 system requires exactly one power supply located at the leftmost position of the 1768 bus. This module provides the necessary current for the 1768-L4x controller and any 1768 communication modules (such as the 1768-ENBT or 1768-CNB).