Allen-Bradley 1756-PB75R Redundant Power Supply – ControlLogix Series
Imagine a critical production line — an automotive stamping press, a pharmaceutical batch reactor, or an oil & gas pipeline compressor station — suddenly losing power to its control system. Without a reliable, redundant power supply, a single power fault can cascade into unplanned downtime, product loss, safety incidents, and hundreds of thousands of dollars in recovery costs. The Allen-Bradley 1756-PB75R exists precisely to eliminate that risk: it is the backbone of power continuity for mission-critical ControlLogix installations worldwide.
The 1756-PB75R occupies a unique position within Rockwell Automation’s ControlLogix 1756 platform as the dedicated redundant-capable AC power supply. Designed to operate in parallel with a second 1756-PB75R unit via the 1756-PSCA2 chassis adapter, it delivers seamless bumpless power transfer upon primary supply failure — a capability demanded by process industries where even milliseconds of control interruption are unacceptable. As part of the globally dominant ControlLogix ecosystem, the 1756-PB75R is deployed across tens of thousands of installations in more than 80 countries, making it one of the most trusted power supply modules in industrial automation history.
Technical Specifications
- Part Number: 1756-PB75R
- Series: Allen-Bradley ControlLogix 1756
- Power Output: 75W (backplane)
- Input Voltage: 85–265V AC, 47–63 Hz (wide-range universal input)
- DC Output: 1.2V, 3.3V, 5V, 12V (backplane rails)
- Redundancy: Yes — hot-swap redundant pair via 1756-PSCA2
- Chassis Compatibility: All 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5–95% non-condensing
- Certifications: UL, CE, cUL, ATEX (consult datasheet for zone ratings)
- Dimensions (H × W × D): Occupies 1 chassis slot
- Weight: Approx. 980 g
- Enclosure Rating: Open-type (for use in IP54 or better enclosure)
Key Features & Benefits
- True Hot-Swap Redundancy: Pair two 1756-PB75R units with the 1756-PSCA2 adapter for automatic, bumpless failover — zero interruption to the control system during a power supply fault.
- Wide-Range Universal AC Input: Accepts 85–265V AC across 47–63 Hz, eliminating the need for external transformers in global deployments and simplifying multi-region installations.
- 75W Backplane Power: Sufficient to drive fully populated ControlLogix chassis with mixed I/O, communication, and motion modules under demanding industrial loads.
- Diagnostic LED Indicators: Onboard status LEDs provide instant visual feedback on power health, enabling rapid fault identification without opening the enclosure.
- Rockwell Integrated Architecture Compatible: Fully supported by Studio 5000 Logix Designer and RSLogix 5000, with no additional configuration required for redundancy operation.
- Long Service Life: Designed to Rockwell Automation’s industrial-grade MTBF standards, minimizing lifecycle replacement costs in 24/7 continuous process environments.
Industry & Equipment Applications
- Oil & Gas: Pipeline SCADA, compressor control, wellhead automation — where power redundancy is a safety-of-life requirement.
- Pharmaceutical & Life Sciences: Batch process control, clean-room HVAC, validated manufacturing lines requiring 21 CFR Part 11 compliance.
- Automotive Manufacturing: Body welding lines, paint shop conveyors, powertrain assembly — high-throughput lines where downtime costs exceed $10,000/minute.
- Water & Wastewater: Pump station control, treatment plant SCADA, lift station automation with remote monitoring.
- Power Generation & Utilities: Turbine control auxiliaries, substation automation, distributed energy resource management.
- Mining & Metals: Conveyor drive control, smelter process automation, crusher and mill management systems.
System Integration & Compatible Parts
- 1756-PSCA2 — Power Supply Chassis Adapter (required for redundant pair operation)
- 1756-PB75 — Non-redundant 75W AC power supply (single-supply alternative)
- 1756-PA75R — Redundant 75W AC power supply, alternate voltage range variant
- 1756-L8x / L7x Series — ControlLogix 5580 / 5570 processors (primary controller partners)
- 1756-EN2T / EN2TR — EtherNet/IP communication modules for integrated network architecture
- 1756-RM2 / RM2XT — ControlLogix Redundancy Modules for full controller-level redundancy systems
Our Quality Assurance Process
Every Allen-Bradley 1756-PB75R sourced through Konmask.com undergoes a rigorous multi-stage verification process before shipment:
- Authenticity Verification: Physical inspection of Rockwell Automation holographic labels, date codes, and catalog number markings against manufacturer databases.
- Functional Power-On Test: Each unit is bench-tested under load to confirm correct output voltages on all backplane rails and proper LED status indication.
- Cosmetic & Mechanical Inspection: Connector pins, housing integrity, and PCB condition checked for any signs of prior field use, damage, or counterfeit indicators.
- Documentation Package: Shipment includes test report, product datasheet reference, and certificate of conformance upon request.
- Traceability: Lot and serial number records maintained for full supply chain traceability.
How to Order
- Submit your inquiry via the Contact / RFQ form on this page or email support@konmask.com.
- Provide your required quantity, delivery timeline, and destination country.
- Our team will respond within 1 business day with availability confirmation, lead time, and a formal quotation.
- Upon PO acceptance, we arrange secure packaging and international freight with full tracking.
- Post-delivery technical support is available for integration and commissioning questions.
Why Choose Konmask.com?
- ✅ Specialized in Industrial Automation: We focus exclusively on PLC, DCS, and automation hardware — not a generalist distributor.
- ✅ Global Shipping: Experienced in export documentation, customs compliance, and international freight to 50+ countries.
- ✅ Responsive B2B Service: Dedicated account managers for OEMs, system integrators, and MRO procurement teams.
- ✅ Competitive Pricing: Direct sourcing relationships enable pricing advantages on both new and surplus inventory.
- ✅ Technical Expertise: Our team includes engineers with hands-on ControlLogix commissioning experience — we speak your language.
Frequently Asked Questions
Q: Can the 1756-PB75R be used without a redundant partner?
A: Yes. The 1756-PB75R can operate as a standalone single power supply in any 1756 chassis. The redundancy feature is only activated when paired with a second 1756-PB75R and the 1756-PSCA2 chassis adapter.
Q: What is the difference between 1756-PB75R and 1756-PA75R?
A: Both are 75W redundant-capable supplies. The 1756-PB75R accepts 85–265V AC (universal range), while the 1756-PA75R is optimized for 120/240V AC nominal input. The 1756-PB75R is generally preferred for international and multi-site deployments.
Q: Is this module compatible with ControlLogix 5580 (L8x) processors?
A: Yes. The 1756-PB75R is compatible with all ControlLogix chassis generations, including those housing the latest 5580 series processors.
Q: Do you supply new, surplus, or refurbished units?
A: We supply both new (factory-sealed) and tested surplus units. All units are clearly identified by condition in your quotation. Refurbished units are not offered.
Q: What is the typical lead time?
A: In-stock units typically ship within 3–5 business days internationally. Lead time for factory-new units varies; contact us for current availability.
Q: Can you provide a Certificate of Conformance or test report?
A: Yes. A CoC and functional test report are available upon request for all orders.
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