Square DX Series Wi-Fi Dimmer Review: Contractor Quality and Price

Schneider Electric enters the smart lighting market with a series of Wi-Fi switches, dimmers and wall sockets bearing its Square D brand. Marketed as the X Series, these Wi-Fi devices connect only to Wi-Fi networks of 2.4 GHz. The company says it will ship Z-Wave versions of this series in early 2022.

We reviewed the X-series Wi-Fi dimmer here; specifically, the model number SQR226U1 supports loads up to 600 watts. Schneider seems to be targeting this product at contractors as it comes in a replacement green box with installation instructions, wiring diagrams, and safety warnings. If you are a newbie who needs some level of grip during installation, Schneider Electric recommends hiring a licensed electrician if you are not familiar with the process, this is not the switch for you.

Cover plates are sold separately; more on that in a moment. On the positive side, this switch can be used for both single-pole and three-way applications, and the latter scenario does not depend on a Square D complementary switch; You can reuse any three-way switch that is already on the other end of the circuit.

This review is part of TechHive’s coverage of the best smart light switches and dimmers, where you will find reviews of competing offerings, as well as a buyer’s guide on the features to consider when purchasing this type of product.

The dimmer itself consists of two buttons that function like a more common rocker switch: a short press on the top button turns on a connected light, and a short press on the bottom button turns it off. Pressing and holding the lower button dims the light, while doing the same on the upper button illuminates it. The dimmer remembers the last brightness setting when the switch is turned off and returns to that state when it is turned back on.

dx series square dimmer switchSchneider Electric

The X series dimmer has two buttons instead of a rocker mechanism.

Please note, however, that unlike other wall dimmers, there is no calibration system here. This can lead to dimming problems with some types of bulbs, particularly older LEDs. Also, the buttons are quite stiff and can take a lot more pressure to activate than competitive switches. This could be a problem for some users, including older adults and young children.

Connectivity comes via screw terminals with pressure plates on the sides, as well as push connections on the back. I tried both wiring methods and found that the push connections were loose; the wires sometimes came out as I pushed the switch towards the wall. Meanwhile, the pressure plates are almost impossible to unhook, forcing me to connect the wires to the screw terminals directly.

Dx series dimmer squareSchneider Electric

X series switches have back pins, pressure plates, and screw terminals. If you need pigtails, you will have to create your own.

There is not much space under these screws, which makes this process difficult. Square D does not include wire braids or nuts, so I had to supply mine to connect the switch to both the neutral wire (which is required) and the ground wire, both of which were tied together with similar wires inside my box. This added complexity to my installation.

square app d wisest 2 Christopher Null / IDG

Schneider’s Wiser Home app presents some basic statistics about your home environment.

Once installed and secured to the wall, I turned to Square D’s Wiser Home mobile app. The setup in this step requires you either scan a QR code provided on a label on the box or manually enter a complex alphanumeric SSID and a access code, with a total of 32 characters. Don’t lose these stickers; without them, the system will be impossible to connect to your Wi-Fi network.


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