The BT137S-800F.118 part of WeEn Semiconductor is an 8 Amp, 800V sensitive gate triac. It is an ultra-sensitive bidirectional triac thyristor that relies on gate current for latching and triggering. It features an ultra-sensitive gate current, very low on-state voltage drop, and a fast turn-off time. It is suitable for phase control applications such as light dimmers, solid-state relays, temperature controllers, and motor speed controllers.