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

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.

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

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!

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.

This relay module works well. It can be triggered by connecting to power or ground depending on how the jumper is set. Web page says 5 ma but that is for the trigger, the relay takes 43 ma at 12.5 volts when the relay is on and takes 5 ma when the relay is off. I was going to use this for a solar power for a project but even though 43 ma operating current is relatively low, I need every ma so wasting 43 ma on the relay will not work so I am going to look for a latching relay. If you need a relay triggered by a low current then this might work for you.

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.

Used it to link my old house security alarm to my new security camera system. Now I can receive alarm to my cell phone.

This is a pretty simple device and circuit but I am stymied with respect to opto coupler etc. No documentation in packaging or on their web site either. I would like to understand how to utilize the opto-coupler. Thanks. Feb 04 2026 followup. This was put into service as a T/R switch between amateur radio transceiver and linear amplifier. Hundreds of cycles so far with no issues. Some have complained about premature relay failure. I will followup in 6mo to Year ifnit is still functioning. Definitely worth the money.

work great