Relay Module One Way 30A Optocoupler Isolation Relay Module High Power Relay High/Low Level YYG-2(24VDC)

Works as expected. This was a replacement for the first one I bought which was dead on arrival.

Tested it, it works

Ordered 9 all defective unfortunately I hadn’t use them yet in my business and the return window closed yesterday. DONT BUY!!

It's amazing how cheap electronic have become that has been much more just a couple of years ago. This is not an industrial grate relay. I am not enough of an expert on why not but fortunately another reviewer already did that. Scroll down to read his opinion and reasons about why it's probably and literally overrated. STILL this is a great budget way to switch a high voltage component with a low voltage circuit. For example switching lights with an Arduino controller. I am taking one star off because I doubt it can handle 30 amps. Other than that it works as advertised and reliable so far.

Some serious design issues with the layout:1 - The high current traces are too small to handle the claimed 30 amps without extreme temperature rise. The designer put in a reflow channel that should have had a large buildup of solder to make up for the thin 1 oz copper foil but manufacturing never went back and overfilled the the traces with solder. Without the reflow it is capable of about 17 amps with a 40°C rise in trace temperature2 - The mounting holes are too close to the relay terminals to actually fit the heads of the screws and on the control side the heads will eventually cut through the solder mask and short to the ground. On the back side it's worse since a M3's 6mm head could overlap both ground and Vcc to short out your power supply.It's still useful as long as you understand the above issues