SKU: 1756-PA75

Allen-Bradley 1756-PA75 ControlLogix 75W AC Chassis Power Supply

The Allen-Bradley 1756-PA75 is a 75W AC power supply module designed for ControlLogix 1756 chassis. It features a universal 85-265V AC input and provides 13A of 5.1V DC power to the backplane. With integrated surge protection and global voltage compatibility, it serves as the reliable power foundation for high-performance PLC systems.

Robust Backplane Power Generation and Global Compatibility

The Allen-Bradley 1756-PA75 functions as a high-capacity 75-watt power supply unit that provides the essential DC voltages required by ControlLogix backplanes. This module accepts a wide universal input range of 85V to 265V AC, allowing it to operate on global power grids without the need for manual voltage switching. By converting high-voltage AC into stabilized 1.2V, 3.3V, 5.1V, and 24V DC outputs, the 1756-PA75 ensures that every processor and I/O module in the rack receives consistent, ripple-free power. Furthermore, the unit occupies the dedicated left-most slot of any standard 1756 chassis, creating an organized and standardized power entry point for the entire automation system.

Integrated Protection and Process Continuity

To protect sensitive electronic components from grid instability, the 1756-PA75 incorporates advanced surge suppression and overcurrent protection. The power supply maintains an internal hold-up time of approximately 2 cycles, which allows the PLC to ride through brief voltage dips without triggering a system reset. This capability significantly reduces nuisance shutdowns in facilities with fluctuating power quality. Additionally, the hardware features a front-facing LED indicator that provides real-time status updates; a solid green light confirms that the output voltages remain within the specified operational tolerances.

Thermal Management and Environmental Resilience

Rockwell Automation engineered the 1756-PA75 for the rigorous thermal demands of industrial control cabinets. The module dissipates heat through a specialized ventilated housing, enabling reliable operation in ambient temperatures reaching up to 60°C. To prevent electrical hazards and ground loops, the unit provides reinforced insulation between the AC line input and the DC backplane. This high level of isolation, routine-tested at 2500V DC, ensures that field-side transients do not propagate to the controller’s logic circuitry. These features collectively support the long-term health and stability of mission-critical ControlLogix architectures.