美国采购需求：高效电源，高品质直流电源，可编程电源，可调电源，2000~4000W，直流电源

I'm looking for a power supply unit that can deliver 400V DC output at a current rating of 5A. The unit should be compatible with a single-phase AC input of 220V. It's essential that the design meets relevant safety and efficiency standards, ensuring reliable performance in various applications. Additionally, please include any details regarding the available features, such as protections against overvoltage and overcurrent, as well as thermal management options. It would be helpful to know the dimensions and weight of the unit, along with lead times for production and delivery. Looking forward to your detailed response.