Thyristor surge protection, Thyristor application, Silicon controlled rectifier

 BTA16 Series 600 Vdrm 16 A Flange Mount Logic Level Triac Thyristor - TO-220AB

https://www.futureelectronics.com/p/electromechanical--circuit-protection--protection-thyristors/bta16-800cwrg-stmicroelectronics-2290567