2pcs DC 5V Relay Module 4 Channel Relay Board Shield with Optocoupler Isolation Suport High/Low Level Trigger

Always handy to have on hand.

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.

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.

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.

Worked well with 5v signals from wemos mini d1.

Both of these and a 4 pack of 2 relay boards all found with good solder connections and working perfectly.