ZMP400 400W AC/DC Switching Power Supplies ETA-USA ZMP400 400W AC/DC Switching Power Supplies feature ITE and medical dual safety approvals and 400W power density in a 5' x 3.2' footprint. ETA-USA ZMP400 Power Supplies feature a 5656VDC isolation voltage and <,0.5W no-load power consumption. This single-output series offers >,91% typical efficiency and 400W total power with forced air cooling.