2-Channel 5V Relay Module High Low Level Triggering Optocoupler Isolation Load 30A DC 30V AC 250V for PLC Automation Control, Industrial System Control

The package came and I wired it up to the Arduino and power and it works flawlessly. I amended the times to heat the desiccate and now it dries the desiccate perfectly it also controls the solenoid which selects the column. I had a 5VDC charger at 2000 mA so both the arduino and the relay board were powered from the one 5V charger and it really cleaned up the installation. I bought a second relay as a spare but there is a good chance I will not need it for a long time. This relay boards are pretty quiet which is a bonus.

Used with Arduino. Arduino 5v pin was insufficient current to drive the relays. I needed to provide a separate 5v supply. Once I understood this requirement, the relays have worked well. Able to connect 12Gauge wire to the high voltage terminals, as the terminals are sized large enough to accept this gauge.

It fits perfectly for my project (automatic control for an electric water heater). The hardware looks good quality and it works well. A point to note is that you have to connect your arduino to an external power source.

Used with Raspberry pi 3 b+, powered 5V internal for swimming pool equipment.

Works great. It's handling 19 amps thru the NO and 9.5 amps thru NC connections. handles 10 awg wire. Minimal heat. Had to externally power the ardunio to get it to trigger the relay. USB power was not enough.