# Which Switches Faster? Transistor, Solid-State Relay or Relay

Which Switching Device can Switch from Off to On and Off the fastest?

1. Transistor
2. Solid State Relay
3. or Mechanical Relay
• What's the purpose of the switch? What are you ultimately trying to accomplish? Jan 7, 2016 at 8:43
• what do you think is likely to switch faster? A lump of metal or charge carriers in a piece of semiconductor?
– Icy
Jan 7, 2016 at 8:45
• @NickAlexeev Im trying to find what device is most suitable for quick changes in the power Jan 7, 2016 at 10:02
• @Icy what about the difference between solid state relays and transistor? Jan 7, 2016 at 10:07
• Your question is being downvoted because it is NOT specific. Without any details about the amount of voltage or current you want to switch, it's far too broad. Also, "the fastest" is far too vague -- are you talking about the speed of a single transition, or the overall repetition rate? If you gave us some context about what you're actually trying to accomplish, we'd be able to provide specific advice. Jan 7, 2016 at 16:53

Speed of switching vs Component.  Time 0-------------------------------------------------Eternity (~25mS)
 
Transistor |***** SSR |******* Relay |***************************************************************>>  Capiche?