The Quadrac are used in compact electrical circuits where it can save space & time by using a single package instead of using discrete parts. The DIAC is used as a triggering element for the TRIAC in this package. Quadrac is a made of a DIAC & a TRIAC embedded into a single package. It is made of an SCR with a Zener diode that determines the triggering voltage. SUS or Silicon Unilateral Switch are semiconductor device that are used as triggering element. It has the same electrical properties as a DIAC but they have lower breakover voltages. SBS or Silicon Bilateral Switch is a triggering device used as the triggering element for TRIAC. it is essentially a TRIAC without a gate terminal. It is a bi-directional semiconductor device made of 5 layers to handle high voltages and current. SIDAC stands for Silicon Diode for Alternating Current is a similar device to the DIAC but it has relatively high breakover voltage & current handling capabilities. They are used in dimmer applications & motor speed control etc. It can switch high AC current & voltages. The gate input is used for triggering the conduction in each direction. it is a modified version of SCR that can conduct and also control the current flow in both directions. The name TRIAC is made up of Triode for Alternating Current. They are mostly used for triggering the TRIAC by connecting it in series with its gate terminal. It can conduct current in both directions when the voltage increases from its certain breakdown voltage limit. it is bi-directional semiconductor device with the analogy of a two diodes connected in antiparallel combinations. The name DIAC is made up of Diode AC switch. IGCT has very fast turnoff capability because it uses a very fast-rising current pulse to drain all charge from its cahode. It is made up of a gate-commutated thyristor (GCT) with a multi-layer PCB for gate drive circuit. IGCT or Integrated gate-commutated thyristor is a special type of thyristor that is used for switching high voltages in industries.
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