Product Overview The ETP4890-B3A1-1 is a high-performance embedded telecom DC power supply designed for communication equipment and power distribution scenarios. It adopts 200–240V single-phase AC input and converts it into a stable 48V DC output, with a rated current of 90A and output power ranging from 401W to 500W. This standard 3U subrack power system is equipped with matched rectifier modules and an SMU monitoring unit, featuring ultra-wide voltage adaptation, high power