Based on this product's specifications, here are some alternatives and similar models
External Power Adapter HP 280W — Server Power Supply, 280W Output
Summary description:
External power adapter for HP servers with 280W rated output. Designed as a server power supply to provide stable DC power to compatible HP systems and external server components. Suitable for replacing original HP 280W adapters, supporting continuous operation in server racks, maintenance, and hardware upgrades where a compact external power source is required.