Types of Protection Thyristors, Thyristor high current, types of thyristors, phase control

 Snubberless Series TO-220-3 1200 V 25 A Through Hole Triac

https://www.futureelectronics.com/p/electromechanical--circuit-protection--protection-thyristors/t2550-12i-stmicroelectronics-9071459