A1ED65T1234A1V-Y0001 is an adapter board specially developed by Firstack for the 4FHS0660CA1xxxx series driver core to drive IGBTs in the T1T2T3T4 position of the AB module NPC topology. It integrates passive devices such as IGBT gate resistors, high voltage detection diodes, GE connectors, etc, and connected to the 4FHS0660CA1xxxx driver core via cables.