Triode For Alternating Current (Triac) and Silicon Controlled Rectifier (SCR) is used to control the direction of a current. Here, SCR is used as a unidirectional device with having reverse blocking characteristics, and on the other hand, Triac is a bidirectional device. It can control the current in both directions. In RoboElements, we have all the different types of high quality original TRIAC and SCR IC at a very genuine prices.