HFE 2500W Front End Power Supplies TDK-Lambda HFE 2500W Front End Power Supplies are ideal for distributed power, hot-pluggable, and redundant power systems. HFE 2500W Series Front End Power Supplies operate off a universal AC input of from 85 to 265VAC, with active PFC, and provide a well regulated DC output of 12V, 24V, or 48V. The 19' rack-mount enclosure allows as many as four supplies to be paralleled with automatic load-sharing to provide up to 9.5kW of output power.