1756-PB75R | Allen-Bradley ControlLogix Redundant Power Supply

Product Overview

The Allen-Bradley 1756-PB75R provides high-availability power for ControlLogix chassis. This redundant power supply specifically targets mission-critical applications where system uptime remains non-negotiable. By operating in a redundant pair alongside a 1756-CPR2 cable and 1756-PSCA2 chassis adapter, this module eliminates single points of failure in the power distribution layer. We offer this unit as 100% Brand New original stock, ensuring factory-grade protection for your expensive processors and I/O modules.

Technical Specifications

The 1756-PB75R maintains stable voltage levels across the backplane using the following parameters:

Engineering Advantages

• Fault-Tolerant Architecture: The 1756-PB75R functions as part of a managed redundancy system. If one power supply fails, the partner module instantly assumes the full load without causing a CPU reset or data loss, protecting active industrial processes.

• Thermal Resilience: This module delivers its full 75W output at temperatures up to 60 °C (140 °F). This high-temperature rating allows installation in compact enclosures where heat buildup often compromises lower-grade power components.

• Streamlined Maintenance: The design allows for "Hot Swap" capability when used in a proper redundant configuration. Maintenance teams replace a faulty supply while the PLC remains live, significantly reducing Mean Time to Repair (MTTR) and avoiding costly plant shutdowns.

• Input Voltage Flexibility: While optimized for 24V DC, the wide 19.2V to 32V DC input range accommodates fluctuations common in battery-backed systems or long-distance DC distribution lines, ensuring the backplane receives consistent, filtered power.

FAQs

• Q: Can I mount the 1756-PB75R directly into the ControlLogix chassis slots?

• A: No. Redundant power supplies mount externally to the chassis. You must use a 1756-PSCA2 chassis adapter to bridge the power from the supplies to the backplane.

• Q: Does this unit work with AC input?

• A: No. The 1756-PB75R accepts DC input only (nominal 24V). If your facility uses 120/240V AC, you must select the 1756-PA75R model instead.

• Q: Is a redundancy cable included with this part number?

• A: No. You must order the 1756-CPR2 redundancy cable separately to link the two power supplies.

• Q: How does the "Brand New" status affect the internal electrolytic capacitors?

• A: Our 100% Brand New stock comes from recent production batches. This ensures the internal capacitors have not degraded from years of shelf storage or previous heat cycles, providing the full expected service life of over a decade.