The BT138-800G.127 is a part of the NXP “BT” family of Thyristor/Diode products. This item is a high power Silicon Controlled Rectifier (SCR) that is specifically designed for switchmode and current limiting applications. This device features a peak reverse working voltage of 800 volts, a current rating of 127 amperes, and a forward blocking voltage of up to 800 volts. This part is ideal for applications where high current control is required, such as high-power rectifier circuits, AC motor control, and other power switch applications. It is also suitable for phase control, phase shifting, and snubber applications.