2pcs Relay Module 24V Relay Board Shield 4 Channel with Optocoupler Isolation Suport High/Low Level Trigger

Found these on Amazon to go with the Elegoo UNO R3 controller. The set that came in the "starter kit" had pins to activate the relays and that didn't seem to secure. These have screw terminals. These also have a high/low activation setting so you can switch the high/low back and forth. I would suggest that if you need relays, these will be a better choice.

Works as advertised. I do like the ability to change the control input from either a hi or lo signal to control the relays. Most only work with a hi control input.

Always handy to have on hand.

The relays in the 12 volt version have 10 amps printed on them at all the various voltages. I am switching an inductive 2 amp load, so was interested in the 15 amp rating shown for 115 volt. Still are great deal. For those with PLC 's with outputs that go to ground when energized, the four jumper pins simply need to be moved from the default com and height positions to com and low.

This relay board has a small footprint yet includes the all-important jumpers to select high or low trigger input. This will save you the headache of changing your circuit and only cost a little extra. The small Screw terminals are kind of average among brands. They are undersized for the wire size that fits compared to the amperage rating on the relay.

Did a check on the relay and all 4 relays appeared to function using high or low signal trigger(audible and LED check only, no continuity test). Both boards were fine. Relays were not theones shown in the listing but are the same I've received on other similar boards [ Songle ].

I use these relays circuit ti control air suspension solenoids on a motorcycle....They handle pretty good and did not see any fail.I used these circuit to keep everything tightter and compact as possible

The board performed as expected. It was quite simple to figure out how the board works, and how to make the necessary connections.