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You can find a more detailed explanations and calculations on this site: Also you can see the respective power ratings if you compare the resistor sizes from a ready made SSR: The resistor in question is the bigest one in Melf package its length is close to Triac width (6.6mm), probably it's 0207 size (5.8mm) @ 1W. Note how smaller the R1 and RGK are. ...


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Throwing a guess. Only condition to see what you describe, assuming everything else ok, is: Q3 turn on lags. Q3 turn on lags, most likely from large current (heavy load). Motor inrush current is one that contributes to. Zero crossing may not help as hope, since the inrush condition lasts over many cycles. You can see it on oscilloscope. Sensitive TRIAC will ...


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Mechanical relays have a life in the 50,000 to 100,000 operations range at full current. You can look up the particular datasheets for those in your relay boards. If the relays are carrying close to full current and are switching every few seconds 24/7 they will not last long. For example, 100,000 operations at 3 seconds per cycle will wear the relay out in ...


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