williangomes.a Posted June 17, 2019 Report Share Posted June 17, 2019 Hi comunity, I'm using a bta41-600B to control a shower (resistive load purely), using an arduino and zero cross detection to control over phase angle, the circuit draws aproximately 38 amps, triac is mouted in a good heatsink, but as when i increase the voltage in the potentiometer, when it draws more than 25 amps for example, the triac start self triggering and doesn't dimmer anymore(the voltage increase at maximum, even removing the gate signal the triac keeps on at full voltage, i've tried using a capacitor and resistor (39R and 100nf) as a snubber but doesn't work, I've changed the triac but It always happen, thanks for any help. Quote Link to comment Share on other sites More sharing options...
HarryA Posted June 17, 2019 Report Share Posted June 17, 2019 Your circuit is basically incorrect. The DIAC , labelled TRIAC1, would never carry the load in that type of circuit! Only the gate current for the TRIAC. see the circuit at: https://www.electronicshub.org/simple-fan-regulator-circuit/ for example. Good luck. Quote Link to comment Share on other sites More sharing options...
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