Crowbars are interesting. Assuming an SCR is used with fast rise time being the trigger (via capacitative coupling to the gate
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I just had a sensitive gate SCR on a curve tracer this morning, its fast, but not that fast. Tq for a fast inverter SCR is 20 uS, for a normal one it is 100 uS and that is anode current dependent. Great for crowbars where Di/Dt is not so critial, but a stock scr is not fast enough to shunt a 25 nanosecond pulse. Or am I wrong?
On the other hand, a designed for speed SCR might be:
http://www.littelfuse.com/data/en/Ap...tes/an9708.pdf
Steve