The 1756-PA75K ControlLogix AC Power Supply Module from Rockwell Automation is a rugged chassis-mounted power supply unit with conformal coating, designed for ControlLogix systems operating in harsh, humid, corrosive, or high-vibration industrial environments.
Functionally, it delivers regulated backplane power to all modules in the ControlLogix chassis, including processors, I/O modules, and communication modules. The “K” suffix indicates conformal coating protection, making it more resistant to moisture, dust, and chemical exposure compared to standard versions.
It is widely used in marine applications, chemical plants, energy systems, heavy manufacturing, and outdoor industrial installations where environmental protection and long-term stability are critical.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-PA75K |
| Series | ControlLogix Power Supplies |
| Module Type | AC Power Supply (Conformal Coated) |
| Input Voltage Range | 85–265V AC |
| Nominal Input Voltage | 120/240V AC |
| Input Frequency | 47–63 Hz |
| Maximum Input Power | 100 W |
| Maximum Output Power | 75 W @ 0–60°C |
| Backplane Output (1.2V DC) | 1.5 A |
| Backplane Output (3.3V DC) | 4 A |
| Backplane Output (5.1V DC) | 13 A |
| Backplane Output (24V DC) | 2.8 A |
| Inrush Current | ~20 A |
| Hold-Up Time | Up to ~20 cycles (depending on input) |
| Isolation Voltage | 250V continuous |
| Conformal Coating | Yes (enhanced environmental protection) |
| Mounting Location | Left side of ControlLogix chassis |
| Compatible Chassis | 1756-A4 / A7 / A10 / A13 / A17 series |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Weight | ~1.1–1.2 kg |
Physical Dimensions
- Size (H × W × D): 140 × 145 × 145 mm
The compact but rugged chassis-mounted design ensures stable integration into ControlLogix systems while maintaining environmental sealing benefits from conformal coating.
Recommended Related Models
The 1756-PA75K is commonly paired with:
- 1756-PA75 standard AC power supply
- 1756-PB75 DC power supply
- 1756-L71 / L73 ControlLogix processors
- 1756-EN2T EtherNet/IP communication modules
- 1756-IB16 / OB16 I/O modules
- 1756-A7 / A10 ControlLogix chassis
Popular Allen-Bradley ControlLogix Power Supplies
Within the ControlLogix family, commonly used power modules include:
- 1756-PA75K conformal coated AC power supply
- 1756-PA75 standard AC power supply
- 1756-PA72 AC power supply
- 1756-PB75 DC power supply
- 1756-PB72 DC power supply
These modules ensure stable and scalable power distribution across ControlLogix architectures.
