Inkbird Solid State Relay 40DA DC SSR Black Heat Sink for PID Thermostat Temperature Controller

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.

I mounted this on the upper side of my CR10 S5's PSU for my upgraded bed heater. I upgraded the fans in the control box and added a stand that has a raspberry pi and 12v Noctua fan powered by the Pi's USB. The exhaust from the case is never warm and I never notice a spike in my Pi's temps in octoprint.I was weary of fakes, which seem to be everywhere, but this one has worked great for me.

Great product. Just make sure you don’t run too many amps through it.

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.

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.

I built a unit to conrtol the temperature on my tempering oven I use for knife making. My inkbird items all work great. For very little money I was able to take care of the huge varience of temperatures I was having. I purchased an SSR, heat sink and a PID. All work great. Highly reccomend.

this is a "Solid" relay! lolits been working great on my 3D printer for a few months now.I use to control my 120V bed and it works beautifully. easy to wire doesn't even get warm.the bed is 300x300 750w silicon pad. and I'm not even using the heat sink with that kind of load.

I used one of these as a relay for my hot tub motor. The relay was switching 120 volts and 11.3 amps AC. The switching mechanism was hooked up to 9 volts DC.The relay was rated for 40 Amps, and was within range of the load and switching ratings. After 3 months it stopped working and was burned up and bloated.This was not switching the heater element, so the 11.3 amps was the true load.Even accounting for the surge needed for motors, this relay was well within limits and failed.Cannot recommend.