Product review (3 stars): Not for constant loads, other than that it's ok
OK, i didn't realize that SSR is probably not good for my purposes, but this item does work as advertised. It probably won't be able to handle constant loads at even 1/4th of it's claimed capacity. It says 40A, but even 6A load over 1 hour make it heat up considerably. I will try add a heatsink (arrived today), but i suspect solid-state relays are no meant for constant loads to begin with. For controlling dual exhaust turbines that pull about 1200W each and are in "on" state 70% of the time, these relays are not a good fit for that purpose. For my purposes i need to find an alternative electromechanical relay.

Also please don't try testing this relay with typical desk lamp. You'll see blinking on and off. There is a small amount of voltage that leaks through in "off" state, and typical light bulb acts as a capacitor and that leaking voltage turns into much larger fluctuation making lamp blink every 2-3 seconds. I read online that most of SS relays like this one have this, so nothing wrong with this particular one.