alien

Recipes 

Way too expensive! And shipping on top. For $19 I got 3x 40A Fotek's shipped.

Mr Natch, your idea will work fine with thermal compound on both surfaces. In fact the metal box itself might be enough of a heatsink.

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Magic Smoke brewhouse and grill

Automatic Smoker - Cooler MLT - Counterflow Chiller

Homercidal

Recipes 

No, I cut an opening in the side of the box for the heatsink to fit into, with tabs of plastic so I could run screws through the tabs, into the SSR and thread into the heatsink. My heatsink was one of those cheap ones that come with the SSR and there was no way to mount the heatsink to the plastic and have it outside the box while the SSR was inside.

I thought I had a good solution until the heads of the screws sunk into the tabs a bit.

It's something I probably should have realized before I built it, but didn't. When I build my permanent control panel I'll do like Kal and use a large heatsink, no plastic required. I guess I was just in a hurry to test it out.

alien

Recipes 

I've drilled holes in a big computer heatsink and screwed it on the back of an SSR, and mounted it so it stuck out the back of a plastic box. This worked because the back surface of the heatsink was slightly smaller than the back of the SSR.

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Magic Smoke brewhouse and grill

Automatic Smoker - Cooler MLT - Counterflow Chiller

mendesm

Recipes 

Walker

Recipes 

I would not rely on your heatsink just being in open air to properly cool an SSR that is carrying 23A. Those bastards get HOT.

I always strongly recommend a fan to blow air across the heatsink.

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Ground Fault Brewing Co.