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.
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.
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.
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.
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