The BT139-600.127 is a Thyristor manufactured by WeEn Semiconductor. The device is a 600V, 13A, very sensitive gate, 3-pin device with a reverse blocking voltage rating of 600V. It is suitable for applications such as relay, lamp, lamp control and provides fast switching times, low gate trigger currents, and durability due to its planar construction. It is UL-recognized, RoHS compliant, and has UL1577(IV) isolation.