[Elecraft] What does SWR-protected mean?

[Stephanie Maks]

I noticed on the Elecraft website, that both the K1 and K2  
specifications use the term "SWR-protected" in the description of the  
PA transistors.

What does this mean, exactly?  If the K1 or K2 is presented with high  
SWR, will the radio shut down or shut off or unkey or something?

Thanks and 73 de Stephanie
va3uxb
K2#5311 - K1#2132