Product Details
Product Overview
The Allen Bradley 1756-PB72K provides high-current DC power directly to the ControlLogix backplane, supporting a wide range of I/O, processors, and communication modules. This 100% Brand New original unit features a specialized conformal coating, making it the primary choice for mission-critical systems operating in corrosive or humid environments. It converts an 18–32V DC input into stable power for the entire chassis, ensuring continuous operation of complex automation logic.
Part Number Breakdown
The "K" suffix in the 1756 series signifies specific environmental hardening:
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1756: Identifies the ControlLogix Platform.
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PB: Indicates a DC Power Supply (Standard).
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72: Represents the 75-Watt power capacity and specific physical frame.
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K: Denotes Conformal Coating (Protective layer against salt spray, moisture, and chemical contaminants).
Technical Specifications
The following table outlines the electrical and physical performance data for the 1756-PB72K:
| Feature | Specification |
| Input Voltage Range | 18–32V DC |
| Output Power | 75 Watts @ 60 °C |
| Output Current (Backplane) | 13 Amps at 1.2V; 13 Amps at 3.3V; 13 Amps at 5.1V; 2.8 Amps at 24V |
| Weight | 2.01 lbs (0.91 kg) |
| Mounting | Left side of 1756 Chassis |
| Protection Type | Conformal Coating (K-Version) |
| Input Overvoltage | Reverse polarity protected |
Engineering Advantages
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Corrosive Environment Resilience: The conformal coating shields internal circuitry from airborne contaminants and moisture. This prevents dendritic growth and short circuits in wastewater treatment plants or chemical processing facilities.
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Simplified DC Integration: The module accepts a broad 18–32V DC input, allowing direct integration with standard 24V DC industrial battery banks and redundant power systems without additional transformers.
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High-Density Power Output: It delivers 75 Watts of power in a compact footprint, supporting fully loaded 17-slot chassis without requiring multiple power supplies in standard configurations.
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Rapid Maintenance Access: The chassis-mount design features a quick-release mechanism. This allows technicians to replace the unit in seconds, drastically reducing Mean Time to Repair (MTTR) during critical failures.
FAQs
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Can I use the 1756-PB72K in a standard ControlLogix chassis?
Yes. This module fits any standard 1756 ControlLogix chassis. However, it specifically occupies the dedicated power supply slot on the far left side of the rack.
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What is the benefit of the "K" version over the standard 1756-PB72?
The "K" version includes a factory-applied conformal coating. Choose this model if your installation site faces high humidity, salt air, or chemical vapors that would otherwise degrade standard electronic components.
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Does this power supply require a separate fuse?
The module includes internal protection, but we recommend installing an external 10A fast-acting fuse on the DC input line to protect the supply from significant upstream surges.
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Is this unit refurbished?
No. We guarantee this 1756-PB72K is 100% Brand New and Original. It ships in factory-sealed packaging with the manufacturer’s warranty intact.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
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Choosing the Right Controller: PLC vs. Motion Controller in Industrial Automation
Selecting the optimal control architecture is a foundational decision in industrial automation. Engineers must frequently choose between a Programmable Logic Controller (PLC) and a dedicated Motion Controller. While both systems manage machinery, their underlying design philosophies differ significantly, impacting performance, scalability, and system integration.
Mastering PLC Power Supply Architectures and Operating Voltages
Selecting the correct operating voltage is a critical step in designing reliable industrial automation systems. Whether you are working with a compact PLC or a large-scale DCS, your power architecture dictates the system's longevity. In this guide, we explore the standard voltage ranges and power distribution strategies required to maintain stable factory automation operations.