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The Allen-Bradley 1756-PA75 is a robust standard power supply designed for the ControlLogix system, delivering essential backplane power for module operation in a wide voltage range of 85-264VAC at 47-63 Hz. It supports various chassis models, including 1756-A4 through 1756-A17, and provides outputs of 4A at 3.3VDC, 13A at 5.1VDC, and 2.8A at 24VDC with a total output rating of 75W in temperatures from 0 to 60°C. Notably, it features reinforced insulation and a high isolation voltage of 250V, ensuring reliable performance even in demanding industrial environments up to 2000 meters altitude, and maintains operation briefly during power interruptions with hold-up times varying by voltage level.