Originally Posted by gar  Al:
Specifically what is "semiconductor fusing"? Are you referring to very fast thermal fuses, or some kind of semiconductor device used as a fuse? (edit) You responded while I was composing my question. (end edit)
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Gar
Semiconductor fuses or Rectifier fuses as some manufacturers call them, are designed to protect solid state circuitry, typically SCR/PWM drives etc, they typically have very fast sweep-out rates and have no time delay element.
Most of the fuse manuf. offer them, Ferraz-Shawmut for e.g.
http://us.ferrazshawmut.com/oem/reso...ATIONS2_44.pdf
Al.