Allen-Bradley 1769-PA4 is a high-power single-slot AC expansion power supply for 1769 CompactLogix L3x/L3y series systems. As the upgraded high-current version of the 1769-PA2, it features dual-selectable AC input ranges, delivering 4A@5VDC backplane power and 2A@24VDC auxiliary power with a 240W maximum rated power. It is specially built for ultra-high-density I/O racks and large-scale automation systems that require massive bus power supplementation.

Core Technical Parameter Specifications

Module Type：1769 Compact I/O high-power selectable AC power supply

AC Input Voltage Range：Dual selectable 85–132VAC / 170–265VAC industrial wide voltage

Input Frequency：47–63Hz full-range industrial frequency compatibility

Backplane Bus Output：5VDC / 4.0A ultra-high current rack power supply

Auxiliary Output：24VDC / 2.0A external auxiliary power output

Max Rated Power：240W high-power continuous output capacity

Max I/O Expansion Capacity：Supports massive high-density I/O module stacking expansion

Max Inrush Current：30A instantaneous startup surge current tolerance

Insulation Grade：2596VDC 1s reinforced isolation withstand voltage

Wiring Specification：22–14 AWG industrial copper wire standard

Operating Temperature：0℃ ~ +60℃ continuous industrial operation

Storage Temperature：-40℃ ~ +85℃ wide temperature storage tolerance

Environmental Humidity：5%–95% non-condensing humidity adaptation

Certifications：UL, CSA, CE, Class I Div 2 hazardous location compliance

Dual-Gear Selectable Voltage & High-Power Output Advantage

The biggest upgrade of 1769-PA4 compared with standard 1769-PA2 is its selectable dual AC range and doubled power capacity. Equipped with internal gear switching design, it freely adapts to global 120V and 240V industrial grid standards, solving voltage matching problems in cross-regional equipment deployment. The 240W high-power rating completely eliminates backplane power bottlenecks for high-load racks.

It provides industry-leading 4A 5VDC backplane current, fully supporting full-load operation of stacked high-density analog, relay and high-power digital modules. The upgraded 2A 24VDC auxiliary output supplies stable power for multiple on-site sensors, solenoid valves and small auxiliary equipment, greatly reducing reliance on external power supplies. Built-in overcurrent, overvoltage and short-circuit protection ensures full-rack equipment safety and long-term stable continuous operation.

Ultra-High-Density Rack Support & High-End Retrofit Performance

Standard PA2 low-power power supply is insufficient for large-scale I/O expansion, easily causing system instability, module dropout and signal jitter under full load. The 1769-PA4 high-power design perfectly solves high-load operation pain points, supporting ultra-large-capacity I/O stacking expansion and meeting the power demand of medium and large CompactLogix automation racks.

It adopts unified single-slot compact structure and full 1769 system compatibility, supporting plug-and-play upgrade replacement for PA2 low-power modules without cabinet modification or program adjustment. It is the core power upgrade solution for high-end equipment OEM design, old factory high-density cabinet renovation and large-scale intelligent production line expansion projects, effectively improving system load capacity and operational stability.

Industrial Application Scenarios

AllenBradley 1769-PA4 is widely deployed in high-load, high-density I/O industrial automation scenarios, including multi-station automated assembly lines, high-speed packaging machinery with massive analog/relay modules, large-scale logistics sorting systems, medium-sized chemical process control racks and intelligent manufacturing full-load automation equipment.

North American high-end equipment OEMs adopt PA4 for high-power standardized rack design to support full-load high-density I/O operation. Latin American large manufacturing factories deploy PA4 modules to upgrade insufficient power old racks. European intelligent automation projects rely on its wide voltage adaptation and high-current stability to build high-reliability industrial power supply systems.