The heat sink tab is isolated.
BTA12-600B 12A 600V Isolated Triac
BTB12-800B TRIAC 12A, 600V UK Seller
BT138-600E 12A 600V TRIAC TO-220, NXP, holding current 30mA, max 125C - ref:xyx
BTA12-600B 12A 600V TRIAC TO-220 - ref:Txyy
STM BTA12-600C ORIGINAL Medium Current TRIAC 600V 12A TO220 UK STOCK x3pcs
3X TYN612 600v 12A triac ST TYN612 MRG MRC