Allen-Bradley 1756-PA72 ControlLogix AC Power Supply | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-PA72 is a high-performance AC power supply module designed for the Rockwell Automation ControlLogix 1756 chassis platform. It delivers stable, regulated DC power to backplane-mounted I/O, processor, and communication modules in demanding industrial automation environments. This page provides full technical specifications, compatible replacement models, application guidance, and a structured selection guide to help engineers and procurement teams make confident sourcing decisions.
Technical Specifications
- Part Number: 1756-PA72
- Brand: Allen-Bradley / Rockwell Automation
- Series: ControlLogix 1756
- Input Voltage: 85–265 V AC, 47–63 Hz (universal AC input)
- Output – 1.2V Backplane: 10 A (max)
- Output – 5.1V Backplane: 4 A (max)
- Output – 24V DC User: 2 A (max)
- Total Power Output: 72 W
- Operating Temperature: 0 °C to 60 °C
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5–95% non-condensing
- Chassis Compatibility: All 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Slot Occupancy: 1 slot (left-most slot of chassis)
- Certifications: UL, CE, CSA, cUL
- Weight: Approx. 1,150 g
- Catalog Number: 1756-PA72 / Series B
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as direct or functional replacements for the 1756-PA72. Always verify chassis slot count, power budget, and firmware compatibility before substitution.
- 1756-PA72/B – Series B revision; direct drop-in replacement with identical electrical specs
- 1756-PA75/B – Higher-capacity AC supply (75 W); backward compatible, preferred for fully loaded chassis
- 1756-PB72 – DC input equivalent (18–32 V DC); same output ratings, for DC-powered panels
- 1756-PB75/B – DC input, 75 W; recommended upgrade path from 1756-PB72
- 1756-PA16 – Lower-capacity AC supply (16 W); suitable only for lightly loaded 4-slot chassis
- 1756-PSCA2 – Redundant power supply chassis adapter; used with 1756-PA72 pairs for high-availability systems
Note: Third-party compatible modules may exist. Konmask.com supplies only genuine Allen-Bradley / Rockwell Automation parts. Contact us to confirm cross-compatibility for your specific chassis configuration.
Why Choose the Original 1756-PA72
- Proven reliability in continuous 24/7 industrial operations across automotive, oil & gas, and utilities sectors
- Universal AC input (85–265 V AC) eliminates the need for external voltage conversion in global deployments
- Integrated diagnostics with front-panel LED status indicators for rapid fault isolation
- Hot-swap capable when used with 1756-PSCA2 redundancy adapter — zero-downtime power maintenance
- Full Rockwell Automation firmware and Studio 5000 compatibility — no configuration changes required
- Long product lifecycle with Rockwell’s published end-of-life and migration support roadmap
Typical Applications
- Automotive assembly line PLC control panels
- Oil & gas pipeline SCADA and DCS integration nodes
- Water/wastewater treatment plant automation
- Pharmaceutical batch process control systems
- Power generation and utilities substation automation
- Food & beverage packaging line controllers
- Mining and materials handling conveyor systems
System Compatibility
The 1756-PA72 is compatible with the full range of ControlLogix 1756 platform components:
- Processors: 1756-L61, 1756-L62, 1756-L63, 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Communication Modules: 1756-EN2T, 1756-EN2TR, 1756-EN3TR, 1756-ENBT, 1756-DNB, 1756-CN2
- I/O Modules: All 1756-series digital and analog I/O modules
- Redundancy: Compatible with 1756-SRM (System Redundancy Module) configurations
Selection Guide
Use the following criteria to determine whether the 1756-PA72 is the right power supply for your application:
- Step 1 – Calculate chassis power budget: Sum the backplane current draw (1.2 V and 5.1 V) of all installed modules. The 1756-PA72 provides 10 A @ 1.2 V and 4 A @ 5.1 V. If your total exceeds these values, select the 1756-PA75/B instead.
- Step 2 – Confirm input power source: If your panel supplies AC power (85–265 V), the 1756-PA72 is appropriate. For DC-powered panels (18–32 V DC), select the 1756-PB72 or 1756-PB75/B.
- Step 3 – Assess redundancy requirements: For mission-critical systems requiring power redundancy, pair two 1756-PA72 units with a 1756-PSCA2 adapter.
- Step 4 – Verify chassis slot count: The 1756-PA72 occupies the leftmost slot. Ensure your chassis has sufficient remaining slots for all required modules.
- Step 5 – Check Series revision: Series B (1756-PA72/B) is the current production revision. Series A units are functionally equivalent but may have limited firmware support on newer processors.
Quality Assurance & Sourcing
- Genuine parts only: Konmask.com sources exclusively from authorized distributors and verified supply chains — no counterfeit or refurbished units without explicit disclosure.
- Pre-shipment inspection: All modules undergo visual inspection, label verification, and packaging integrity checks before dispatch.
- Traceability: Lot codes and date codes are documented and available upon request for regulated industries.
- Warranty: 12-month warranty against manufacturing defects. Extended warranty options available — contact us for details.
- Export compliance: All shipments comply with applicable export control regulations (EAR/ECCN). Documentation provided on request.
How to Order
- Online: Add to cart directly from this page. Bulk pricing available for orders of 3+ units.
- Email: Send your BOM or part list to support@konmask.com for a formal quotation within 24 hours.
- Phone/WhatsApp: +0086 19859288691 — available Monday–Friday, 09:00–18:00 CST.
- Lead time: In-stock items ship within 1–3 business days. Out-of-stock items: 7–21 business days depending on sourcing.
- Payment: T/T (bank transfer), PayPal, and major credit cards accepted. LC available for large orders.
- Shipping: DHL, FedEx, UPS express worldwide. Sea freight available for bulk orders.
Replacement & Compatibility FAQ
Q: Can I replace a 1756-PA72 with a 1756-PA75/B without any configuration changes?
A: Yes. The 1756-PA75/B is a direct physical and electrical replacement. No software or firmware changes are required. It provides slightly higher output capacity, which is beneficial for fully loaded chassis.
Q: Is the 1756-PA72 compatible with the newer 1756-L8x series processors?
A: Yes. The 1756-PA72 is fully compatible with all 1756-L8x (ControlLogix 5580) processors and chassis. No hardware modifications are needed.
Q: Can I use two 1756-PA72 units for power redundancy?
A: Yes, when combined with the 1756-PSCA2 Power Supply Chassis Adapter. This configuration allows hot-swap replacement of a failed power supply without interrupting system operation.
Q: What is the difference between 1756-PA72 and 1756-PB72?
A: The 1756-PA72 accepts AC input (85–265 V AC), while the 1756-PB72 accepts DC input (18–32 V DC). Output specifications and physical form factor are identical.
Q: Are third-party replacement power supplies safe to use?
A: Konmask.com does not recommend unverified third-party replacements for safety-critical systems. We supply only genuine Rockwell Automation parts to ensure full compatibility and warranty coverage.
Q: How do I verify the Series revision of my existing 1756-PA72?
A: The Series revision (A or B) is printed on the module label. Series B is the current production version and is recommended for new installations.
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