TWTADE SSR-40 DD 40A DC 3-32V to DC 5-60V SSR Solid State Relay + Heat Sink

We used this to create an additional safety shutoff for a mobile solar power system. Our control circuit measures the battery voltages, and if any are over the tolerance setting, it cuts a small relay that then cuts power to this unit. This unit then faithfully disconnects the solar input, effectively preventing over-charging and increasing overall system safety. Unit has been in use consistently for several months now and has performed reliably. Our load is much smaller than it's rating though (about 10 Amps at ~30 volts), but the unit does not appear to get warm even while handling this.

I gave this product 5 stars because it works very well. I am using 12 volts DC for the signal, so it operates very reliably and it works well, switching it on and off frequently over extended periods of time while controlling a load up to 35 amps or so into the inductive load of a 2500 watt ZVS induction heater running at 48 volts. However---- as others have said, the reference diagram is wrong and needs to be changed. Even the INPUT is listed as being AC!!!

This relay caused me hours of scratching my head. I am using it in a Tesla and i'm thinking something is wrong with the car. Come to find out that even though the circuit I chose to activate this was working properly, this relay stayed on and allowed the power to go through what is supposed to be open contacts. Instead, the ohm reading is 372k ohms of resistance which is enough to keep the led lights I used to stay on all the damn time. This wiring was all in an enclosed space so it's kind of a pain in the butt to deal with. I ended up tapping off of another circuit and using a standard relay for now just to have things working. I only had it wired for 2 days. The voltage going to it was between 8 and 15 volts dc and the load was probably an amp at 15 v dc. This was well within the range listed.

They work great, but as many other reviewers have pointed out the documentation is incorrect for the output wiring. Be sure to reverse the load and power terminals. I used these SSRs to control the temperature of jacketed fermentation tanks. So far they work great!

Good quality product

works well for my ebike. cuts power even with a small signal

Have these relays connected from a Sainsmart board relay for connecting real solenoids(flipper and slingshot) in my virtual pinball machine. It has protected the sainsSmart Board from blowing its onboard relays.

I bought this for a large LED installed; its max draw is 25 amps at 12VDC. It worked for about a total of 60 minutes of run time, and then the relay failed on and my and was extremely hot. I am going to move to a bosch mechanical relay.

Remplacer l'original pour une fraction du prix

Have only bench tested it so far (no load), but it works as described.

received DOA. output is always on, does not switch.

very nice

I almost returned this item because it didn't seem to work, but it turns out that I just didn't wire it up properly. There are others who left reviews here saying that the product diagram wasn't right and it may not have been at one time but it appears to be correct now. When I tried other ways it didn't work properly (didn't switch the load. either always on or always off). I used this to add a 24v aux power supply to my Velleman (RepRap) K8200. This SSR allowed me to use the original 15V power as a control for a secondary 24V power supply. See my photo for how I wired it up. The current limiting resistor is optional and the value depends on your input voltage can reduce long term wear on the SSR. It would be great if the vendor included a data sheet with the appropriate power and switching characteristics of this SSR, which would help greatly to pick the right resistor value. BE CAREFUL WHEN SELECTING A RESISTOR AS I FOUND TOO HIGH A VALUE WILL CAUSE THE SSR TO NOT FUNCTION PROPERLY AND/OR POSSIBLY OVERHEAT.