Hi everyone, I am designing a crowbar circuit that should operate normally until 10.5VDC, using a Silicon Bilateral Switch triggering a triac. I am putting a fuse on the supply line so the triac will trigger the fuse and blow. My problem is I am trying to use this crowbar to prevent my device from AC mains voltage, so 120 VAC. I have hooked my crowbar to bench ac and dc supplies and it does limit the input voltage when the input exceeds 10.5V However, bench supplies only put out so much current. Is there any triac out there that can take whatever the mains puts out in terms of current? Here is a schematic. The supply says 80, but ignore that. The triac is where the scr is and the SBS is where the zener diode is. I switched them because I first designed it to protect only against DC, but then needed AC protection, so I switched those elements out with bidirectional ones.