The IBM 01AF591 is a high-capacity AC power supply unit, providing up to 1400W of power, specifically designed for compatibility with certain IBM server models. Operating within a voltage range of 200-240 VAC, it is engineered to deliver reliable and efficient power conversion for enterprise-level server systems that demand high power inputs for their operation. This power supply supports a range of advanced features including active power factor correction (PFC) to minimize energy loss and enhance electrical efficiency. Additionally, it is built with robust safety features to protect against overvoltage, undervoltage, short circuits, and thermal overloads, ensuring the safe and uninterrupted operation of connected server equipment. The unit's high wattage capacity makes it particularly suited for supporting server configurations with high computational power needs, multi-processor setups, or extensive memory and storage requirements.