Re: How much heat sink?
Wrap your hands around a lit 40 watt light bulb for "a few minutes" then I might consider your claim. That's about what the SSR is generating at 35A load. I'm betting you won't get past 30 seconds, if that.
One thing you have to keep in mind is that the SSR's load capacity goes down as it heats up. It looses about 20% for ever 10°C over 40°C (104°F). So by the time you start feeling that light bulb warmth over your body temperature, that 40A SSR has started loosing its load capacity. By 50°C (122°F), its capacity is down to 32A. POP! goes the SSR drawing 35A.
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