Metal oxide varistor surge protection, Commutation of thyristor - tatanh1983/conchodom GitHub Wiki TN2540 Series 800 V 25 A Surface Mount Standard SCRs - D2PAK https://www.futureelectronics.com/p/electromechanical--circuit-protection--protection-thyristors/tn2540-600g-tr-stmicroelectronics-7056106