Thyristors can control high voltages and levels of current and so these can be used in high voltage, direct current power transmission lines, Power switches in factories and similar industrial settings

Thyristor or SCR (silicon controlled rectifier) can only conduct in one direction so it is mostly called as DC switch. TRIAC is having two anti-parallel SCRs and can conduct in both directions when triggered and therefore called as AC switch.

Thyristor also called SCR stands for Silicon Controlled Rectifier. It is a semiconductor switching device, with two power terminals, called the anode (A) and cathode (K) and one control terminal called the gate (G). Anode to Cathode current after trigger exceed the Latching Current.

It is defined as angle measured from the instant that gives maximum output voltage to the one at which it is actually triggered. It is measured from the angle that gives largest average. output voltage

“TRIAC” stands for triode for alternating current. As suggested by its name, this electronic component is commonly used as a control element in alternating current (AC) circuits.