What should I take in account when using a more powerful triac

  
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The resistance of my heater is made of 9$Omega$ 3mm diameter nichrome wire. On 240V(rms) voltage this makes 25A(rms) current. I have an access to a mains line capable of delivering 30A, so in theory I will be able to drive heater at full load. In reality I probably won`t, but nevertheless, I want to build a unit that could do that in theory if
What should I take in account when using a more powerful triac - schematic

needed.



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