Lasted about 6 months before overheating @ 110v 15amp draw for 30 hours continuous load properly heat-sinked but in hot environment. Seems to be a decent quality product overall, especially at this price point.
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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The SSR I received was counterfeit and could not handle the 30A/240V circuit that I needed to drive. Based on the breakdown of knockoff SSRs (link at the bottom of this review), the one I received likely contains a TRIAC that is only rated for 20A and not 40A. Because of this, I was getting erratic behavior. For example, the SSR would fail to the closed position if the duty cycle was over 40% or so, but operate as expected if the duty cycle was lower. Long story short, the unit I received melted quite a bit inside the enclosure, despite an ample heat sink. This product is a fire hazard because it is not properly labelled.http://www.instructables.com/id/The-inner-workings-of-Counterfeit-FOTEK-SSRs/
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