Shelly Plus 1 UL | WiFi Smart Relay Switch with Dry Contacts | Home Automation | Bluetooth Gateway | Alexa, SmartThings & Google Home Compatible | No Hub | Remote Control | Garage Door Opener (4 Pack)

Bottom Line Up Front: These are high-quality smart relays made by a reputable company. They provide "dry contacts" (that is, they simply connect or disconnect the wires connected to the switched terminals. They do not connect the relay terminals to line voltage. The switched terminals are fully isolated from the line voltage that powers the relay.) which are useful for switching both low-voltage and line (120V or 240V AC) voltage circuits. They do not require any network access, and can be configured using the device's built-in WiFi access point or Bluetooth connection using the Shelly app or built-in webserver. You can also control the relay with a separate switch, like a regular light switch or pushbutton switch, which allows you to control loads with higher current or voltage than your switch could handle. You optionally can use the free Shelly cloud service and/or integrate it into a variety of smart home systems like Home Assistant. This model is UL listed, which means it has been tested by a third-party testing laboratory for electrical and fire safety and has passed those tests. I recommend them.Background: My house occasionally gets power outages, and also has rooftop solar and Tesla Powerwalls (to provide whole-house backup power). I wanted to ensure that my central air conditioner and electric vehicle charger would switch off when there was an outage and the batteries had been discharged to 50% or less, but neither the AC nor the charger were "smart" devices that could play nicely with my Home Assistant installation at home.Power: The relays can be powered with 120-240V AC mains power, 24-60V unregulated DC (the relay has an internal regulator), or 12V DC from a voltage-regulated power supply.Terminals: The relays have screw-type terminals that can support stranded or solid wire up to 14 AWG size (12 AWG will not fit). The manual recommends solid wire, but I've found that stranded wire with crimped ferrules work extremely well and do not loosen with time.Installation: My AC has "utility curtailment" terminals that are intended for an electric utility-provided device to signal the AC to turn off for short periods of time when the electric grid is overloaded. The AC's terminals required a dry contact relay to signal when the AC should turn off or on, which these Shelly relays have. I simply powered the Shelly using the 240V connectors in the AC unit (I added 1A fuses to the wires powering the Shelly for safety) and connected wires from the relay terminals to the AC's utility curtailment terminals. After connecting the the Shelly relay to my home's WiFi network and adding it to my Home Assistant server, I configured some Home Assistant automations to turn the relay off when the power was out and the Powerwalls were <50% full.For my car charger, I installed a Shelly relay in a similar way, except I connected the charger's "control pilot" wire to the relay terminals. When the Shelly relay is on, the charger works as expected. When the relay is off, the car and charger both detect the loss of the pilot signal and immediately stop charging and the charger opens it's high-current contactor to make the plug connector electrically safe. As far as both car and charger are concerned, the charging plug was simply disconnected.Integration with Home Assistant: Home Assistant supports these relays natively, including a bunch of useful properties like the device's internal temperature, detecting and installing firmware updates, state of the relay and the input switch terminal, and others. Integrating them with Home Assistant is a cinch.Standalone Use: When first connected, the relays operate in a "standalone" mode where each creates its own WiFi access point to which you must connect in order to configure and use them. This access point can be disabled or secured at your option. You can connect to the relay's built-in web interface or use the Shelly app to configure the device, change any communication methods (turning the access point on or off, connecting to a different WiFi network, enabling Bluetooth control, etc.). You can configure the relay with schedules, responses to certain actions, and so on. The web interface and app are both intuitive, easy to understand, and have many useful options and settings one can change.Connectivity: It is possible to use this relay with no WiFi connectivity whatsoever if that is desired. Once configured, it's possible to have the device be completely standalone, be controllable locally using Bluetooth and/or it's standalone WiFI access point, or be connected to a WiFi network with or without internet access. No cloud service is required, nor is there any dependence on any outside service. That said, Shelly does offer a free cloud service to remotely access the relays if one wishes, but it is not required.Put simply: these are great relays that do what they're advertised to do, don't require any external connectivity, and integrate well with Home Assistant.

I just purchased and installed 4 of these. They were extremely simple to install and even easier to setup. I highly recommend these to control lighting. These do require a neutral wire so make sure you have available. I installed 3 of them with 3 analog switches in a 3 gang box and one thing I wouldrecommend is having some stranded flexiblewire instead of trying to use all solid core wire. This will make fitting and everything a little easier.I am new to Shelly products but so far so good 5x dimmers2 4x Plus1 1x H&T G3 1x 2pm and all have been plug play super simple to connect setup and use.Thanks Shelly!!!!

Very capable and versatile units, especially for less than $20 per device. I am using a pair of these to control an exhaust fan that powers on when the motorized damper in the basement is open. The Shelly app made it very easy to connect both units to my Wi-Fi network and set up the logic to operate one device as an on/off sensor and the other as a relay to power the fan.

Amazing for such a tiny unit. App immediately found the unit and setup was a breeze. Effortless connection to Alexa.

I have some Feit Electric smart plug in relays that I had been using to turn on my family room lights in my home. They were unreliable (always loosing connection to my home router and I know the wi-fi signal was good) so I decided to try these switches (some times the Feit smart plugs work and some time they don't). I received the first two Shelly relays and had a bit of a learning curve when I started to work out how to use them. I have worked in an industrial plant about 18 years ago as an instrumentation and electrical tech so I am used to working with relays and controls. First of all, so far the Shelly relays are working OK to operate LED light under my kitchen cabinets and LED overhead kitchen lights. The first problem I had was they didn't show a set of dry relay contacts between the I and O on the switch. The second problem was trying setup the relay in the Shelly app on my phone. I am still not sure why the app ask if you want to disable the wi-fi and Blue tooth after you register the relay? The app is not very intuitive so just keep trying different setting until you get it like you want it.The schedule part of the app was also confusing. I wanted my lights to come on one hour before sunset and go off at 11PM. It took a couple of tries to understand that you must schedule each function individually and not all at once. So if you want the lights to come on at 1 hour before sunset you create one schedule for that routine and another one if you want them to go off at 11PM.I have connected the relays to my Google home app using the Google mini and so far that is working great. I can turn the lights on and off with a voice command if I want. These relays are somewhat expensive so the best option is to use one relay to control multiple lights. These worked great for my multiple LED lights under and above my kitchen cabinets. I installed one smart relay inside the wall light switch to control 5 overhead lights. In my den I had three lights that I needed to control so I used a wall box (removed the nails and installed a drop cord plug and wire into the side of the box, then installed outlet and a wall plate cover to cover everything up) and installed the Shelley switch inside to control the outlet. I then ran drop cords to the lights (led bulbs using very little power) behind the couch. It has worked out great. I simply paralleled the relay contact with the wall switch so I can either use the smart switch or the wall switch to turn on the lights. I suppose you could use the SW input on the switch to do the same thing but I felt like it would not make much difference to wire it this way.One thing you need to also remember is the password for the Shelly app. If you forget it, it's not super easy to get it reset. Remember this is a European company so it is not super easy to get things done although it is not that bad. I did get it reset but I had to go to the Shelly website, log in and reset my password.

Shelly is the type of company you buy the device and never look at it again. WHY you ask ...because it always works and never fails.