Allen Bradley 1756-PA72K ControlLogix AC Power Supply Module

Product Overview

The Allen Bradley 1756-PA72K provides stable, regulated DC power to the backplane of any ControlLogix chassis. This AC-input module occupies the dedicated left-side slot of the chassis, sustaining the operation of processors, I/O modules, and communication cards. The "K" suffix designates this unit as a conformal coated version, shielding internal electronics from harsh atmospheric conditions. We guarantee this unit is 100% Brand New original factory equipment, ensuring maximum uptime for your mission-critical automation systems.

Technical Specifications

Engineering Advantages

• Conformal Coating Protection: The 1756-PA72K features a specialized protective film over its internal circuitry. This coating prevents corrosion and electrical tracking caused by humidity, salt spray, dust, and chemical vapors. Engineers specify this "K" version for wastewater treatment, oil and gas, and chemical processing plants to extend hardware service life.

• Universal AC Input: The module accepts a wide input range from 85V to 265V AC. This flexibility allows the power supply to handle global voltage standards and tolerate significant line fluctuations or "brownouts" without interrupting the DC power delivered to the ControlLogix backplane.

• High Thermal Resilience: This power supply maintains a full 75W output even at the upper operating temperature limit of 60 °C (140 °F). The robust thermal design ensures that high-density chassis populated with multiple motion controllers or high-speed processors receive consistent power in non-air-conditioned enclosures.

• Seamless Chassis Integration: The module slide-locks into the far-left position of the ControlLogix chassis. This dedicated placement isolates the power input from the I/O signals, reducing electromagnetic interference (EMI) and simplifying cabinet wiring.

FAQs

• Can the 1756-PA72K replace a standard 1756-PA72 module?

  Yes. The 1756-PA72K is a direct, functional replacement for the non-coated 1756-PA72. It shares the same electrical footprint and mounting requirements while offering superior environmental protection.

• What is the benefit of the "K" version in a clean control room?

  Even in climate-controlled rooms, conformal coating provides an extra layer of insurance against accidental moisture ingress or long-term oxidation of solder joints, effectively lowering the failure rate over the module's 10-15 year lifecycle.

• How do I verify the power requirements for my specific chassis?

  Sum the backplane current draw (at 1.2V, 3.3V, 5.1V, and 24V DC) for every module in your chassis. The total power consumption must not exceed the 75W output rating of the 1756-PA72K. Use Rockwell’s Integrated Architecture Builder (IAB) for precise calculations.

• Is this product factory-sealed?

  Absolutely. We only sell 100% Brand New original units. The 1756-PA72K arrives in its original Allen Bradley packaging with the manufacturer's seal and UPC 885630569444 intact.