The 1769-PA4 is a high-capacity AC expansion power supply for Allen-Bradley CompactLogix and MicroLogix 1500 I/O banks. It delivers regulated 5 V and 24 V DC to high-density analog, specialty, and digital modules, supporting larger I/O banks where standard PA2 power is insufficient. Its universal AC input, short-circuit protection, and robust thermal design make it ideal for complex industrial control systems requiring maximum uptime.
| Item | Specification |
|---|---|
| Catalog Number | 1769-PA4 |
| Input Voltage Range | 85–265 V AC (Auto-ranging) |
| Nominal Input | 120 V AC / 240 V AC |
| Backplane Output | 5 V DC / 4.0 A, 24 V DC / 2.0 A |
| Power Consumption | 200 VA @ 120 V AC, 240 VA @ 240 V AC |
| Max Power Dissipation | 18 W |
| Max Inrush Current | 25 A @ 132 V AC |
| Power Supply Distance Rating | 8 modules per side |
| Isolation Voltage | 250 V continuous (reinforced) |
| Operating Temperature | 0–60 °C (32–140 °F) |
| Dimensions (H×W×D) | 118 × 70 × 87 mm |
Provides double the 5V and more than double the 24V current compared to 1769-PA2
Backward compatible with PA2-powered I/O banks, but wider footprint (70 mm vs 52.5 mm)
Supports up to 8 I/O modules per side
No battery required; dedicated for backplane power only
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