thank you everyone for your answers.
This thread has missed several of your questions. Yes, you should be fusing any mains connections into a device you are controlling. Sizing will depend upon the loads and the relays selected for which you have provided no information.
Indeed, I still lack the DIN norms but I was offered the american ones. I apologize, it is my first/second post.
The 220 V load will be an air pump (5W, 50Hz) which I hope it will do the job.
The other lines will be 12 Volts and they will probably be 4 lines, although I am thinking of adding a fifth one.
The 8 module relay I have has already been mentioned in this post:
On on the side where the screws are (for the 220 V line and the 12 V lines) it states 10 A and 250VAC/30DVC
I assumed that the load could not damage the relay as it would need 5/220 * 1000 = 23 mA.
It could also be that the pump is too small and I have to go for a bigger one, but still low amperage.
Makes no sense whatsoever to me. Could you please explain what you mean by cutting a cable from each one?
Sure thing. I mean using a cable extender (220 V) that has two cables. Opening the isolation, cutting the mass one and put both ends in the relay. Afterwards, seal the relay in a box (plastic/wood?) according to DIN/experienced electrician. This would give me a plug to plug in the wall and an inlet where I can connect the 220 V device to (pump in this case). The other lines I will power through a 12V adaptor with jack connections (I think there is no need to further explain the 12V side).
The actual physical relays are okay (in most cases) but the board designs are usually lacking the required spacing. Most boards also lack the extra cost step of creating an air gap between the high voltage contact side of the relays.
Those 5mm/5.08mm screw terminals won't pass 220VAC testing. 5 < 6.2 or 7.2mm clearance requirement.
If I am connecting the 12 V until relay 5 and I connect the 220 V in relay 8, there would be a spacing of 3.4 cm between the last 220 V and the first 12 V line. Unfortunately this does not solve the clearance requirement, but at least, no 220 V can get to touch an additional 220 V line.
Would I avoid all this issues if I found a pump that works with 12 V instead of 220 V?!
So you're saying those relays are sold as is, no certification ?
In his first line - 8 relay module
The only two things I would begin to think are correct are the specs of the parts used and the of the PCB material (hopefully FR4 and 94V-0). I doubt they spent the money to send of the board to ensure the layout was correct and safe for 220/240VAC.
Do you mean then that ven if I leave this gap, the product is unreliable? Which one would you suggest then?
So, to summarize, what I got is:
-My main is 220V (EU).
-The 8 module relay I have (Songle) does not meet the clearance requirement. (5mm/5.08mm screw terminals < 6.2 or 7.2mm, won't pass 220VAC testing). Which model would (EU/DIN norm/electrician needed)?
-Would I avoid all clearance this issues if I found a pump that works with 12 V instead of 220 V?!
-The module relay might not be safe for 220/240 V, although stated in the module.
-I need to fuse the 220 V line (are the 12 V ok without?). Requirements for the fuses (EU/DIN/electrician norm needed)?
Is anyone familiar with the norm EN 61810-1? Could this one be the one I have been looking for?