Based on this product's specifications, here are some alternatives and similar models
Power supply Dell 870W RDNT EMSN V3 (model 3257W) 870 W output, server power module
Summary description:
Dell 870W RDNT EMSN V3 power supply (model 3257W) is a server-grade power module providing 870 watts of output for compatible Dell systems. Designed for redundant power configurations, it supports continuous operation in rack servers and enterprise hardware. Use it to replace faulty units or to expand power capacity, ensuring stable power delivery and minimizing downtime.