Allen-Bradley 1756-PA75 ControlLogix AC Power Supply | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-PA75 is a high-performance AC power supply module designed for the Rockwell Automation ControlLogix platform. It delivers stable, regulated DC power to the ControlLogix chassis backplane, supporting mission-critical industrial automation systems. This page provides full technical specifications, compatible replacement models, application guidance, and sourcing information to help engineers and procurement teams make confident selection decisions.
Technical Specifications
- Manufacturer: Allen-Bradley / Rockwell Automation
- Part Number: 1756-PA75
- Series: ControlLogix
- Input Voltage: 85–265 VAC, 47–63 Hz
- Output Power: 75 W (backplane)
- Output Voltage: 5.1 VDC (backplane), 1.2 VDC (auxiliary)
- Output Current: 13 A @ 5.1 VDC; 0.8 A @ 1.2 VDC
- Auxiliary Output: 24 VDC, 0.8 A (field-side power)
- Chassis Compatibility: 1756-Axx ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Operating Temperature: 0–60 °C
- Storage Temperature: -40–85 °C
- Relative Humidity: 5–95% (non-condensing)
- Dimensions (H × W × D): 147 × 45 × 144 mm (approx.)
- Weight: ~1.0 kg
- Certifications: UL, CE, cUL
- Catalog Number: 1756-PA75 / Series B
Compatible Replacement & Equivalent Models
The following models are commonly evaluated as replacements or equivalents for the 1756-PA75. Always verify electrical and mechanical compatibility before substitution.
- 1756-PA75R — Redundant version of the PA75; drop-in for redundancy-enabled chassis configurations
- 1756-PB75 — DC input equivalent (18–32 VDC); same 75 W output, suitable when AC input is unavailable
- 1756-PB75R — Redundant DC input variant; mirrors PA75R functionality on DC supply
- 1756-PA72 — Lower-power predecessor (72 W); compatible in most non-peak-load applications
- 1756-PA16 — 16 W supply for smaller chassis; not a direct replacement but suitable for 4-slot chassis with light I/O loads
- Third-party equivalents — Some aftermarket suppliers offer 1756-PA75-compatible units; Konmask.com supplies OEM-grade and verified-compatible modules only
Note: Rockwell Automation does not officially endorse third-party replacements. Consult your system integrator or Konmask.com for sourcing guidance.
Why Choose the Original 1756-PA75
- Guaranteed compatibility with all 1756-series ControlLogix chassis and modules
- Rockwell-validated firmware and diagnostics integration via RSLogix 5000 / Studio 5000
- Proven MTBF in continuous industrial environments (24/7 operation)
- Full warranty support and Rockwell TechConnect eligibility
- Hot-swap capable when used with redundant power supply configurations (1756-PA75R)
- Consistent backplane power quality — critical for high-density I/O and motion control modules
Typical Applications
- Automotive assembly line control systems
- Oil & gas pipeline SCADA and DCS integration
- Water/wastewater treatment plant automation
- Pharmaceutical batch processing (21 CFR Part 11 environments)
- Food & beverage packaging line control
- Power generation and utility substation automation
- Mining and material handling conveyor systems
- Building management and HVAC control panels
System Compatibility
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Controllers: 1756-L6x, 1756-L7x, 1756-L8x series (ControlLogix 5560/5570/5580)
- Communication modules: 1756-EN2T, 1756-EN3TR, 1756-DHRIO, 1756-CN2
- I/O modules: All 1756-series digital and analog I/O
- Motion modules: 1756-M02AE, 1756-M08SE and compatible servo drives
- Software: RSLogix 5000 v16+, Studio 5000 Logix Designer v21+
- Redundancy: Compatible with 1756-SRM redundancy module when paired with 1756-PA75R
Selection Guide
Use the following criteria to determine whether the 1756-PA75 is the right power supply for your application:
- Step 1 — Calculate chassis power demand: Sum the backplane current draw of all installed modules. The 1756-PA75 supports up to 13 A @ 5.1 VDC. If total demand exceeds this, consider dual-supply or a higher-capacity chassis.
- Step 2 — Confirm input voltage: If your panel supplies AC (85–265 VAC), the PA75 is correct. For DC-only panels, select the 1756-PB75 instead.
- Step 3 — Assess redundancy requirements: For SIL-rated or high-availability systems, select the 1756-PA75R (redundant) variant.
- Step 4 — Verify chassis slot: The power supply occupies the leftmost slot of the 1756 chassis. Confirm your chassis model is 1756-Axx series.
- Step 5 — Check auxiliary output needs: If field devices require 24 VDC auxiliary power from the supply, confirm load does not exceed 0.8 A.
Quality Assurance & Sourcing
- All 1756-PA75 units supplied by Konmask.com are sourced from authorized distribution channels or verified surplus with full traceability
- Each unit undergoes incoming inspection: visual check, label verification, and functional power-on test where applicable
- Anti-counterfeit measures: holographic labels, serial number verification against Rockwell databases
- Packaging: ESD-safe bags, foam-lined cartons, moisture barrier where required
- Lead time: In-stock units ship within 1–3 business days; sourced units within 5–10 business days
- Export compliance: ECCN EAR99; no export license required for most destinations
How to Order
- Online: Add to cart directly on this page — select quantity and proceed to checkout
- RFQ / Bulk: Email [email protected] with part number, quantity, and required delivery date
- Phone / WhatsApp: +0086 19859288691 (Mon–Fri, 09:00–18:00 CST)
- Payment: T/T (wire transfer), PayPal, credit card, and trade assurance accepted
- Shipping: DHL, FedEx, UPS express; sea freight available for large orders
- Documentation: Commercial invoice, packing list, COO, and test report available on request
Replacement & Compatibility FAQ
Q: Can I replace a 1756-PA75 with a 1756-PA75R without chassis modification?
A: Yes. The 1756-PA75R is physically and electrically identical to the PA75 and fits the same chassis slot. The redundancy feature is simply inactive unless a second supply and SRM module are installed.
Q: Is the 1756-PB75 a direct replacement for the 1756-PA75?
A: No — the PB75 requires 18–32 VDC input versus the PA75’s AC input. Output characteristics are identical, but input wiring must be changed. Do not substitute without modifying the panel power feed.
Q: Can the 1756-PA75 power a full 17-slot chassis?
A: It depends on module selection. The PA75 provides 75 W / 13 A @ 5.1 VDC. High-density I/O or motion modules may exceed this in a 17-slot chassis. Always calculate total backplane load before specifying.
Q: What is the difference between Series A and Series B of the 1756-PA75?
A: Series B introduced minor firmware and hardware revisions for improved diagnostics. Both series are functionally compatible with the same chassis and controllers. Konmask.com stocks Series B as the current production revision.
Q: Do you supply refurbished or remanufactured units?
A: Konmask.com supplies new and verified-surplus units only. All surplus units are tested and certified before shipment. Refurbished units are clearly labeled as such and priced accordingly.
Q: How do I verify authenticity of a 1756-PA75?
A: Check the Rockwell Automation holographic label, verify the serial number via Rockwell’s PartnerNetwork portal, and inspect the PCB date code. Contact us if you have authenticity concerns about a unit you have received.
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