Lightobject ESSR-40DAC Solid State Relay, DC In AC Out, 40 amp
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Specification Input: 3V-32V DC Control: 24V~380V AC Current: 40A Size (L x W x H): 2.5inx 1.8in x 1in Note: heat sink must be used to avoid damage.
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Top customer reviews
This is a serious safety concern and the failure mode is very dangerous.
* The one from iauto, while smaller than I expected, contains a 25A triac and came with the clear plastic cover as shown in the product photo. The circuit board build quality is fine. I would use this -- and would give five stars if advertised as a 25A without using the Fotek name.
* The one from ximico only contained a 16A triac, no clear cover, and the inside was a potted mess. If I hadn't destroyed it, I'd be sending for a refund knowing what I do now. Zero stars. (I've been using these for 3D printer beds; I'm now attempting to find genuine ones in the U.S. outside of Amazon.)
As long as you're switching *much* less than the rated current, you're probably fine with either. Just don't take them apart!
THE SSR WORKED FLAWLESSLY
The reason for failure was an excessively hot environment in my Softub enclosed in a metal case with no ventilation. It had a heatsink but evidently wasn't enough when on for 30 hours straight in 90 degree weather (outdoors).
It's not the product's fault, I just need to vent it better or add a fan to help cool it properly. Only reason for 4 stars instead of 5 is because I expected it to not have heat problems when drawing less than 1/2 the rated amperage and 1/3 of the rated voltage.
Bottom line: Don't trust the labeled ratings, keep it about half the ratings for amps, in a vented environment with a heat sink and you will be fine. I ordered 2 more knowing the limitations and won't think twice about buying more.
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Search for this Underwriters Laboratories warning notice:
"UL warns of solid state relay with counterfeit UL Recognition Mark (Release...Read more
Do not purchase.