thyristor pick a heat

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all4here

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i use this circuit which is shown in figer.when we start the circuit the thyristor is heat up too much within 5 mint.

i use a 200 watt bulb as a load. which is approximately 0.7 A load.

but the thyristor have the ability of 15 A load.
 

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Not sure if it has anything to do with your problem but the MOC3041 needs greater than 15ma for the led. So 2.6 volts - 1.5 volts max forward drop leaves 1.1volts or maybe 56 ohms for Rin.
 
ronv said:
Not sure if it has anything to do with your problem but the MOC3041 needs greater than 15ma for the led. So 2.6 volts - 1.5 volts max forward drop leaves 1.1volts or maybe 56 ohms for Rin.
Click to expand...


i have change the resister and plz check the pic.

sir the problem is still there and therystor is hot too much
 

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Is your part in the Q6015L5 TO-220 package? How big is the heatsink?
 
Thyistors have about two diode voltage drop so with 0.7 amps current you should have slightly more then 1 watt of heat to dissipate.
 
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