INKBIRD 40A SSR ソリッドステートリレー SSR-40DA 3-32V DCから24-380V AC ヒートシンク SSR-40DA+Black Heat Sink ブラック ITC-100-LW

This works really well, the heat sink really helps keep it cool. I tried another and it overheated. I use it to switch on a 1.5 HP 16 A dust collector in the shop and I have had no problems with it. I have had this over 3 years. The LED inside to not that it is on, is a little dim compared with the other one I have.

Performed so well, I've ordered 2 set's over the last 8 months. Couldn't imagine using anything else. Definitely worth the money! One big call out is. You may want to research the difference between a ssr-Da and a ssr-AA and finally a low voltage contactor for your application needs. I only say this because it appears from the reviews, that many people are miss matching their ssr to their applications. I know that I did this in the beginning and toasted a few myself... Do the research first, it'll pay off in the long run.

Good price, works good in my powdercoat oven. I put a small designated fan on the relay and it stays extremely cool in my application.

The Inkbird HEATSINK combined with the SSR worked well with my temperature controller. The 4 photos indicate an application of controlling temperature with an Inkbird SSR and PID control unit. Basically the unit maintains a set temperature to seedling's on top of a heating mat.

Update: it's been about 3.5yrs since installing these. The bottom one runs the most. Load is constant at about 17.5A when on. Whatever happened, it failed in the ON state and the terminal melted a bit. The enclosure has an 80mm fan for extra cooling. I'm probably going to strip more wire and loop it around the screws for better contact. Original: I have no idea if this device truly has the guts for 40A, but I only need it for a 25A load. Oversized it deliberately based on youtube videos saying SOME sources were under-built knockoffs; can't say either way here since it would take destructive efforts to determine. After being ON for several minutes, the device & heatsink are still under 100F with ambient temp in the mid 60s. 3.3v signal from the controller works fine to switch the devices.