2025-05-01
In industrial automation, reliable and efficient power distribution is essential. The CompactLogix™ power supply series by Allen-Bradley (Rockwell Automation) is specifically designed to deliver robust and regulated power to CompactLogix controllers and I/O modules. Engineered for demanding industrial environments, these power supplies serve as critical components in Programmable Logic Controller (PLC) systems, offering flexibility, safety, and scalability.
This guide covers the two primary CompactLogix power supply families—1768 and 1769 series—detailing their specifications, module options, and ideal use cases for system designers and maintenance professionals.
🔹 1768 Series Power Supplies
Designed to support the CompactLogix 1768 backplane, these power supplies provide DC power and auxiliary support in control systems.
Key Modules:
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1768-PA3 (AC Input)
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1768-PB3 (DC Input)
1768-PA3 Specifications:
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Input Voltage: 85–265V AC, 108–132V DC
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Output Power: 90W (Max), 6W (Min)
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Inrush Current: 50A @ 80–132V AC, 80A @ 195–265V AC
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Isolation Voltage: 250V (Reinforced), 150V (Basic)
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Power Dissipation: 30W Max
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Frequency Range: 47–63 Hz
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Dimensions (HxWxD): 132.75 × 131.25 × 105.50 mm
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Weight: 0.98 kg (2.15 lb)
1768-PB3 Specifications:
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Input Voltage: 16.8–31.2V DC (Nominal 24V)
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Output Power: 90W (Max), 6W (Min)
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Inrush Current: 50A Max
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Isolation Voltage: 250V (Reinforced), 150V (Basic)
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Power Dissipation: 22W
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Dimensions: Same as 1768-PA3
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Weight: 1.01 kg (2.22 lb)
Both units support DIN rail or panel mounting, include overcurrent protection, and feature T4 North American temperature code compliance.
🔹 1769 Series Power Supplies
The 1769 series supports CompactLogix I/O systems and allows for up to 8 modules per side—16 total per power supply.
Key Modules:
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1769-PA2 (AC Input, Standard)
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1769-PB2 (DC Input, Standard)
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1769-PA4 (AC Input, Extended Current)
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1769-PB4 (DC Input, Extended Current)
1769-PA2:
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Input Voltage: 85–265V AC
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Current Capacity: 2.0A @ 5V, 0.8A @ 24V
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Inrush Current: 25A @ 132V AC
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Power Dissipation: 8W @ 60°C
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Dimensions: 118 × 70 × 87 mm
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Weight: 525 g
1769-PB2:
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Input Voltage: 19.1–31.2V DC (Nominal 24V)
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Current Capacity: 2.0A @ 5V, 0.8A @ 24V
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Inrush Current: 30A @ 31.2V DC
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Power Dissipation: 7.5W @ 60°C
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Weight: 525 g
1769-PA4:
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Input Voltage: 85–265V AC
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Current Capacity: 4.0A @ 5V, 2.0A @ 24V
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Inrush Current: 25A @ 132V AC
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Power Dissipation: 18W @ 60°C
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Weight: 630 g
1769-PB4:
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Input Voltage: 19.1–31.2V DC
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Current Capacity: 4.0A @ 5V, 2.0A @ 24V
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Inrush Current: 30A @ 31.2V DC
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Power Dissipation: 14.5W @ 60°C
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Weight: 630 g
Each 1769 power supply module includes standard features such as overcurrent protection, multiple fuse options, and Class T3C or T4 temperature ratings, depending on model.
🔍 Selection Tips
When choosing a CompactLogix power supply, consider:
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System Voltage: Match AC/DC input with available power.
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I/O Load: Estimate number of modules and current draw.
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Environmental Rating: Ensure IP rating, temperature class, and mounting options match application.
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Power Distance Rating: Critical for distributed I/O setups.
⚙️ Applications
CompactLogix power supplies are ideal for:
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Automated manufacturing lines
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Process control systems
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Motion and drive applications
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SCADA-controlled environments
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OEM machines and distributed control systems
Their modular form factor, robust protection, and seamless integration with Rockwell Automation components make them a reliable choice across industrial sectors.
📞 Need Help Choosing?
PLG Automation offers expert guidance on selecting the right CompactLogix power supply. Whether you're building a new system or upgrading an existing one, we can help you source, spec, and install the correct modules for optimal performance.
Contact Us:
📧 sales@plgautomation.com
📞 800-906-9271