I am using MOC3042 with BT139 and snubber 390ohm/2W and 10nF/400V to on/off motor from microcontroller, I can't find data about the motor as it's an old one but it drives quite large shutterenter image description here

  • \$\begingroup\$ What is your question? \$\endgroup\$ – Peter Jennings Oct 20 at 16:12
  • \$\begingroup\$ this works for few times (15-20) then triac got burnt, gate and T1 short circuit, what is the reason? how to fix this? \$\endgroup\$ – Joel Oct 22 at 21:08

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