This is a high voltage double series 2.2KV, 310A module made by Infineon, part number TD310N22KOF. It has a BG-PB60-1 base unit, with a maximum forward voltage of 2.22V and is secured with screws. It is used in many applications such as motor drives, UPS, home and office appliances, rectifying circuits, telecom systems, and renewable energy conversion systems.