1756-PA50 | Allen-Bradley ControlLogix AC Power Supply Module

Product Overview

The Allen-Bradley 1756-PA50 functions as the primary power source for ControlLogix 1756 chassis systems. This standard AC power supply converts universal input voltages (85–265V AC) into the specific DC backplane voltages required by processors, communication bridges, and I/O modules. We provide this unit as 100% Brand New original factory stock, ensuring stable current distribution and voltage regulation for your most critical automation racks.

Technical Specifications

Engineering Advantages

• Universal AC Input Versatility: The 1756-PA50 handles a wide input window from 85V to 265V AC. This eliminates the need for separate regional models, allowing global deployment across different power grids without additional transformers or manual switching.

• Superior Hold-Up Performance: The internal capacitor bank provides a 30ms to 40ms hold-up time. This buffer protects your PLC logic during momentary brownouts or power dips, preventing nuisance trips and keeping the processor in "Run" mode through minor electrical disturbances.

• High-Density Current Delivery: This module delivers up to 8 Amps at 5.1V DC to the backplane. This high capacity supports power-hungry configurations, including high-speed counter modules and multiple EtherNet/IP communication cards within a single 17-slot chassis.

• Integrated Surge Protection: The power supply features a 30A maximum inrush current limit and 250V continuous isolation. These electrical barriers protect sensitive silicon components in the CPU and I/O modules from high-voltage transients often found in heavy industrial environments.

• Vertical Airflow Design: The module’s physical architecture facilitates natural convection. When mounted in the dedicated left-side chassis slot, the 1756-PA50 optimizes heat dissipation, maintaining rated current output even at elevated ambient temperatures up to 60°C.

FAQs

• Can I use the 1756-PA50 in a redundant power supply configuration? No. The 1756-PA50 is a standard power supply for single-supply applications. For redundancy, you must utilize the 1756-PA75R or 1756-PB75R series along with a 1756-CPR2 redundancy cable.

• How do I install the 1756-PA50 into the chassis? This module mounts specifically on the far left side of the 1756 chassis. Align the circuit board with the chassis guides and press firmly until the locking tabs snap into place. Ensure the input wiring follows local NEC or IEC standards for 120/240V AC.

• Does this unit replace the older 1756-PA72? Yes. The 1756-PA50 provides updated electronics and improved efficiency compared to legacy standard AC supplies. It maintains the same physical footprint and backplane compatibility.

• Is this a refurbished or pulled unit? Absolutely not. We guarantee this 1756-PA50 is 100% Brand New and arrives in original factory packaging with intact serial numbers for full warranty and E-E-A-T traceability.