Shelly Dimmer 2

WiFi-operated dimmer working without a neutral line

What is Shelly Dimmer 2?

Dimming without a neutral line

We developed Shelly Dimmer 2 to be able to cover all possible electrical installations all over the world. Shelly Dimmer 2 can be used in houses where the neutral line is missing and provide a full set of dimming functionalities. You can control a wide range of halogen lights, dimmable LED and ferromagnetic transformers.


  • No HUB required.
  • Dimming without a neutral line.
  • Turn-ON/OFF or use the dimming function to set the brightness to your preferred intensity,
  • Integrated internal temperature sensor for overheating protection.
  • Designed to fit in most standard electrical boxes and switches.
  • It can be integrated to work with all other Shelly devices.
  • Compatible with Android, iOS, Amazon Alexa, Google Assistant, and home automation servers using MQTT, CoAP, and REST API.
  • Easily make your Arduino project live and usable in your automation project.


Power supply AC 110-230V ±10%, 50/60Hz
Device temperature protection Yes; 95°C
Overload protection Yes
Power measurement Yes
Dimming Yes
Dimmable LED 50-200VA / 10W – 200W
Incandescent and halogen light sources 10-220W
Working without a neutral line Yes
Colour changing No
Predefined effects Yes
Channels 1 Channel
Operational temperature 0 to + 40°C
Device power consumption < 1 W
Intelligent On/Off Yes
Local and remote control Yes
Sunrise/Sunset Yes
Weekly Schedule Yes
UL Listed option No
Wireless/WiFi Protocol 802.11 b/g/n
Radiofrequency 2400 – 2500 MHz
Radio signal power 1mW
Range up to 50 m outdoors and up to 30 m indoors (depending on the building materials)
Size 42mm x 36mm x 14 mm

Wiring diagrams

How to connect

Standard wiring with neutral

No neutral wiring*

*When using the device without neutral, Shelly Dimmer 2 requires at least 10W of power consumption to operate. If the connected light has a smaller power consumption, then Shelly Bypass is needed for the device to work.

Standard wiring with neutral and SW connected to neutral

No neutral wiring with no minimum load requirements

Device pinout


Use cases

Lighting control

Install Shelly Dimmer, and control any lights at home easily via your smartphone or with your voice. When you are reading your favorite book in the evening, picking a stronger light will ease your eyes. Also, dimming the lights during movie night has never been easier!


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