The Shindengen S20VT60-4000 Bridge Rectifier is a four-phase, AC to DC power conversion device. The device is designed to convert an AC voltage to a DC voltage, and is typically used for applications such as DC inverters, UPS systems, solar inverters, and battery chargers. The bridge rectifier has a built-in blocking diode, which prevents reverse current from passing between the AC input and the DC output. It has a maximum forward current rating of 20A, a maximum reverse DC voltage of 400V, and is rated for a junction temperature up to +125°C.