Aren’t you 220 V systems in Brazil? That will make a difference.
The most popular zigbee relays for 220 V are probably the Orvibo. You can get them from Gearbest, which imports them from China. See the following discussion thread:
You can ask following questions there as those are the people using them.
Brazil uses 220 V, right? Make sure you specify that when you post is the device selections will be different.
Check specifications carefully, however, as the Orvibo are only intended for control of lighting and can’t handle very high loads.
SmartenIT Devices are somewhat better quality, but also more expensive. They come in several different models, some which handle much higher loads. So they are popular for pumps and electric water heaters and things like that. Their ZHA (zigbee home automation) relays should work with SmartThings, a number of people have them. I’m not sure if you’re interested in anything of that type, but here’s their link: