BUY BT137 https://www.utsource.net/itm/p/252393.html
Triacs
Description: The BT137 is a TRIAC, a three terminal bidirectional semiconductor device for controlling AC power. It is a silicon controlled rectifier (SCR) with a gate. Features: Low on-state voltage High current capability High surge current capability Low thermal resistance High commutation capability High dv/dt capability Applications: Motor control Heating control Light dimming Power switching (For reference only)