MYSWEETY 3PCS SSR-40DA Solid State Relay Single Phase Semi-Conductor Relay Input 3-32V DC Output 24-380V AC

These are solid. I've ran these for PID controllers and also for simple circuits. They are solid and work hard for you. Remember heat kills all...so plan on using fans for heat transfer. Keep these cool-ish and just walk away. They will work for you!

Heatpress quit working in the middle of multiple jobs. Did troubleshooting and found out relay was bad. Found this one online, matched up perfectly to the specs I needed. Price was very reasonable for 3 units. Product shipped out quickly and arrived on time. Product matched up exactly for quick simple installation to get us back in production. Would highly recommend this seller.

These are garbage. They are certainly not rated for 40 amps. Two failed on the first day and the third one soon after. I would not buy again. Not safe to use at all.

Bought the 3 pack as I've seen several people post that these are often faulty. First one is working like a dream in my 3D printer. Controlling a 500W 110v bed heater. I attached it to a heat sink i pulled of a failure of a mosfet that I had previously bought. No issues, no excessive heat, handles PWM like a dream.

This is an early review. I usually review such products after a year to give them time to fail. If there is anything to change my mind, I'll update the review as needed.That said, this is not a complicated product: it uses a low voltage to switch a higher voltage. That is precisely what it does, and does it without a lot of problems. I haven't yet tried to switch motors with digital circuits, nor have I tried to push it to its stated limits to see if I can make it fail, but given that I'm not an UL lab, this product does exactly what I bought it to do and shows no signs of failure at this time. Given a short experience, I'd recommend it. It works, is inexpensive and easy to use. Assuming long term reliability, I don't ask for more.

I use these in Kiln controls to replace mechanical relays. The constant on and off at 5 - 7 amps burns the contacts out of 10 amp mechanical relays in about 6 months of near daily use. These last several years, so far, if mounted on a heat synch. Don't forget to buy heat synchs. Switching high current produces heat and it needs to be removed from the relay. if not, they will die an early, if not instant death. Really good for resistive heating loads.

I have only used one so far and it is working as expected. I purchased these to replace a failed 25A that I had been using. I believe these will be better suited for the application. I will probably not test the other 2 until I need to replace one again or another project comes up, but for the price, if even 1 or both of the others are defective this still a good deal.

At 1 amp draw on the output, with a standard SSR heatsink and heatsink compound, it gets uncomfortably warm (holdable but almost hurts). At 5 amps, its hot (holdable, but will burn you fairly quickly). At 10 amps, touching it will likely burn you, it might even ignite some materials, and I know 1st hand it will melt some materials. I am unsure if it could handle prolonged use at 10 amps safely, so i'll find a Better SSR for that load. I have my doubts about the one running at 5 amps, but I am confident when it fails it won't be a safety issue. So I'll use that one, but will need a better backup for when it fails. I dont think the 1 amp will be a problem.I dont have an easy way to test beyond that, and I wouldn't want to try anyways. I needed 3 I can only use 2, but the 3rd works (as well as the others anyways). I'll probably end up burning up 2 of them on the 5 amp load while I get a better replacement. So, I'll be left with 1, after I bought 3.Dont expect to be able to use these without a heatsink, or for anything more than a medium power light (~120W).They get 2 stars because they do work, but at no where near the advertised rating.