HiLetgo 12V 1 Channel Relay Module with Optocoupler Isolation Support High or Low Level Trigger

Before I put something into a project, I bench test it. Wonderful trigger relay, works as described. I recommend this relay. good construction circuit board well built. The picture shows the relay installed into my project.

Beautiful little relay. Connected it to my Honeywell Ademco Vista 20p alarm panel to provide a dry contact to close a trigger that will activate interior/exterior lights upon alarm activation. Took me a while to figure out that for some reason trigger 17 on the panel would not activate the relay. I think it has something to do with the amperage associated with each trigger line(they are different). Use trigger 18 in default configuration (not normally low) and set jumper on relay to low. Connect trigger 18 wire to the "in" terminal, DC+ to 12v hot (red), and DC- to ground (black). Connect your contacts on the trigger out side (mine was normally open for a Lutron radiora2 system). Test your setup by manually activating the trigger: 4-Digit Installer Code + [#] + [718] You should see a red LED turn on. Deactivate the trigger with: 4-Digit Installer Code + [#] + [818] Don't do any fancy jumping across the DC/trigger terminals for this configuration, as some other reviewers have suggested...trust me, I tried them all and nothing worked until I switched from trigger 17 to trigger 18. Hopefully this saves you all a day of your life!

Nice relay for activating your circuits. Works well and shipping was fast. One thing to remember when connecting to your 12V input...Connect the "IN" pin to the "+" pin and connect these to your POSITIVE supply. Tie the "-" pin to your NEGATIVE power source. If you don't tie the "IN" pin to the "+" pin, the relay will not activate. This is the normal procedure for this type of relay. Dependable, and it works every time. Would buy again.

This little thing was inexpensive and works perfectly for what I need it's very minor but my only complaint would be two things when it's powered on it's got basically a green laser that comes out of it that's surprisingly bright and it makes a pretty loud click when it clicks on and off. I had a rather specific scenario I needed this for I was retrofitting linear gas fireplace that I wanted to make smart with a Wi-Fi smart relay and the whole thing is surrounded and marble so there was limited options so pulling wires and such so first I had to get the Wi-Fi really in there which I did successfully but then these Wi-Fi relay is only allow you to switch on a neutral and my switch where I was switching the different colors to my fireplace switched on a positive wire so I needed this basically so I could switch with a positive wire to then switch the negative wires of another relay since it's hidden inside of the fireplace I can't see the light and the click is pretty minor from inside but you can still hear it but at $6 I would buy this all day everyday.

Works great but does not come with any instructions...

I've used this relay on 2 different Can Bus motorcycles to trigger aux lights off the bike high beam signal. Works great for over 3 years now on the first bike I installed it

This relay did not work as intended. Usually a relay will energize its output terminals when a trigger signal is supplied. This one did not. Nor did the first one i ordered. I sent the first one back. Second one additionaly had defective phippips head clamp terminals. Had to solder my DC+ wire to the terminal. The fix for this relay is a jumper wire from the Dc+ to the COM output. The relay switches just fine but without the jumper wire no power to any of the output terminals. The relay is so sensitive that it functions with the 2.5v 800mA Dc trigger signal while on the high jumper setting. The low jumper setting was defective on both relays and did nothing. This relay is garbage. I'm only using to trigger 3 car stereo Amplifiers simultaneously as the 2.5v 800mA trigger signal I have is not enough. This is a non critical low amparage application. My load is probably less than 1.5amps @12v. Highly not recommended for anything critical or safety related.

using to control a POE 48v power supply from a solar 12v system. wiring was a little confusing. The power line that flips the relay does not power the outputs, you'll need to add a power in for either the normally on or normally off diagram. which is cool, because you could use this to relay any voltage you want

work great

Unfortunately, I didn't test this relay immediately after purchasing it. And when I needed it and took it out for use, I discovered it wasn't working. By this time, the return warranty had already expired.