Vishay VS-VSKT136/12PBF, Dual Thyristor Module 1200V, 135A 270mA

Two Thyristors (SCR) configuration
3500V_RMS isolating voltage from the metal base
Industrial standard package INT-A-PAK
High surge capability

UL approved file E78996

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Thyristors - Vishay Semiconductor

A Thyristor is a solid-state semiconductor device with four layers of alternating N and P-type material. They act as bistable switches, conducting when their gate receives a current trigger, and continue to conduct while they are forward biased. Thyristors are synonymous to Silicon-Controlled Rectifier (SCR).
Encapsulated modules with electrically isolated base plate. Suitable for applications such as battery chargers, welders and plating equipment, regulated power supplies and temperature and speed control circuits.