They had 4 diacs total and the top diac was 70v max I think my circuit is 230v so I'm not sure if this is going to work. I have asked everyone and even some electronic suppliers on the net about the KV619 and no one has a clue - how can this happen? The circuit came as a strobe light, from an interent supplier, the brand is visual effects inc. I have done a search for this company and can't find anything on them either. The reason why this diode blew is because, I'm stupid. I have 3 units and I was trying to chain all three together so they would fire at the same time. I took 2 and wired them, this is where I become stupid, and fried the a trace and diac on both boards. The trace is easy to fix, but the diode is proving harder to fix. So now I have 2 units with no triggering and one that does. I might forget trying to fix the fired 2 and continue to work a solution for the triggering. Since I only really need one for triggering maybe I should stay focused on the original idea. What really hurts is these strobes retailed for 8.99$ and I have spent more than in time and buying replacement parts. If you think a diac rated at 70v max would work I'll try that.