If you ordered a protective case for your SmartWise 5V–32V relay module (sold without casing), and you find that the relay module doesn’t fit into the case, here’s the solution:
Sometimes, during the manufacturing process, the excess edge of the relay PCB is not removed at the end of production.
As a result, the relay’s PCB is about 5 mm longer than it should be.
If you look closely, you’ll see a cutout or notch along one edge of the relay module.
That’s the excess section that needs to be removed.
You can snap it off by hand, or use pliers to easily break off the extra strip.
Once removed, the relay board fits perfectly into the protective case.