The 1756-PA75R ControlLogix Redundant AC Power Supply Module from Rockwell Automation is a high-reliability redundant chassis power supply designed for ControlLogix systems that require continuous operation, zero-downtime architecture, and enhanced power protection.
Unlike standard ControlLogix power supplies, the 1756-PA75R is engineered for redundant power configurations, allowing two power supplies to operate in parallel. If one supply fails or is removed, the second unit immediately maintains chassis power without interrupting PLC operation. This makes it ideal for critical industrial processes, continuous manufacturing lines, power plants, oil & gas facilities, and high-availability automation systems.
It delivers stable backplane power to all ControlLogix modules, ensuring uninterrupted system performance in mission-critical environments.
Technical Specifications (Including Size & Weight)
| Parameter | Specification |
|---|---|
| Model | 1756-PA75R |
| Series | ControlLogix Power Supplies |
| Module Type | Redundant AC Power Supply Module |
| Input Voltage Range | 85–265V AC |
| Nominal Input Voltage | 120/240V AC |
| Input Frequency | 47–63 Hz |
| Maximum Input Power | ~115 W |
| Maximum Output Power | 75 W |
| 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 |
| Redundancy Support | Yes (dual power supply configuration) |
| Hold-Up Time | ~2 cycles typical |
| Inrush Current | ~20 A |
| Isolation Voltage | 250V continuous |
| Mounting Location | Left side of ControlLogix chassis |
| Compatible Chassis | 1756-A4 / A7 / A10 / A13 / A17 |
| Operating Temperature | 0°C to 60°C |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5%–95% non-condensing |
| Weight | ~1.45–1.50 kg |
Physical Dimensions
- Size (H × W × D): 175 × 145 × 137 mm
The module maintains the standard ControlLogix left-side power supply footprint but includes additional internal circuitry to support redundant operation.
Recommended Related Models
The 1756-PA75R is commonly paired with:
- 1756-PA75 standard AC power supply
- 1756-PB75 DC redundant power supply
- 1756-PSCA2 redundancy control accessories
- 1756-L71 / L73 ControlLogix controllers
- 1756-EN2T EtherNet/IP communication modules
- 1756-IB16 / OB16 I/O modules
- 1756-A7 / A10 chassis systems
Popular Allen-Bradley ControlLogix Power Supplies
Within the ControlLogix family, commonly used power modules include:
- 1756-PA75R redundant AC power supply
- 1756-PA75 standard AC power supply
- 1756-PA72 AC power supply
- 1756-PB75 redundant DC power supply
- 1756-PB72 DC power supply
These modules support scalable and highly available automation architectures.
