The MB104i4c uses 5 pins (2 for the led and other 3). The MOC 3021
uses only 4 of the 6 pins.

I could add that the triac or thyristor is the KT207i400. I suspect is a
thyristor because the gate is the middle pin (TO-220). Also the
heater remains always on.

Any help to determine these two parts.

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Yianni
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"Rheilly Phoull" wrote in message
...
You could try a MOC 3021 which should be cheap enough.

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Regards ............... Rheilly Phoull

"Yianni" wrote in message
news:1061238052.966770@athprx02...
In my ultrasonic cleaning machine the optocoupler MB104i4c is burned. It
drives directly a thyristor that controls a 500W/230V heater resistance.
Does anyone know which equivalent to use? I couldn't find the above code
anywhere.
Thanks in advance.

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Yianni
(remove number nine to reply)

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