I am thinking of using this relay breakout

http://www.ebay.com/itm/162247557098?_trksid=p2057872.m2748.l2649&ssPageName=STRK:MEBIDX:IT

to control a device that draws max current of 4 amps at 220V AC.

The relay module utilized in the aforementioned link is rated at 10amps so it appears that everything will be OK.

However, upon viewing the 4th (or 5th) picture at ebay -- which shows the breakout's behind, reading "Low level trigger" -- I am wondering if those PCB traces are really capable of 5 amps *mains* current (let alone 10 amps).

I am a beginner and apparently I wouldn't like to start a fire in my house, so any advice is appreciated.

 

It's the relay that will switch that large current, and those traces are both short and wide. I believe it would be OK. If you open similar devices, say a wall switch dimmer, you'd find similar things.

That said, proceed with caution. Provide clearance between the PCB and anything nearby. Consider a fuse on whatever is being switched. Make sure that kids and pets cannot near your enclosure.

 

It's the relay that will switch that large current, and those traces are both short and wide. I believe it would be OK. If you open similar devices, say a wall switch dimmer, you'd find similar things.

That said, proceed with caution. Provide clearance between the PCB and anything nearby. Consider a fuse on whatever is being switched. Make sure that kids and pets cannot near your enclosure.

Thanks @wayneh !

 

If concerned, you could solder on a solid copper conductor from relay to terminals.
I have found this a common thing with Chinese boards.
Also the terminals they use are pretty flimsy.
Max.

 

If concerned, you could solder on a solid copper conductor from relay to terminals.
I have found this a common thing with Chinese boards.
Also the terminals they use are pretty flimsy.
Max.

Good point. Easy insurance.

 

If concerned, you could solder on a solid copper conductor from relay to terminals.
I have found this a common thing with Chinese boards.
Also the terminals they use are pretty flimsy.
Max.

Nice idea, I'll solder nice and thick 2.5mm^2 conductors (thickness of 2.5mm^2 is a typical regulation in home electrical installations in my country), thanks @MaxHeadRoom for the suggestion.

 

Are you going to switch the relay on/off with load powered? Hot swapping should be avoided if possible.