power switch relay ssr scr TRIAC DIAC igbt Thyristor PUT unijunction circuit Unijunction Transistor and UJT Relaxation Oscillator SCR PUJT Thyristor

 power switch relay ssr scr TRIAC DIAC igbt Thyristor

https://learnabout-electronics.org/Semiconductors/thyristors_66.php

https://en.wikipedia.org/wiki/Thyristor

Solid State Relay Safety Features 

https://www.electronics-tutorials.ws/power/solid-state-relay.html

power switch zero cross Peak Voltage limit

https://circuitdigest.com/electronic-circuits/230v-ac-mains-over-voltage-protection-circuit

 

PUT unijunction circuit Unijunction Transistor and UJT Relaxation Oscillator  SCR  PUJT  Thyristor

https://www.instructables.com/Circuit-Collection-of-the-Programmable-Unijunction/

https://www.electronics-notes.com/articles/electronic_components/unijunction-transistors/programmable-unijunction-transistor-put.php