Shelly Dimmer Gen3 – smart dimmer controller

Shelly Dimmer Gen3 – smart dimmer

Device identification

• Device name: Shelly Dimmer Gen3

• Device model: S3DM-0A101WWL

• Device SSID: ShellyDimmerG3-XXXXXXXXXXXX

• Bluetooth ID: 0x1073

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Short description

The Shelly Dimmer Gen3 is a single-channel smart dimmer that lets you remotely control dimmable lamps and drivers from a smartphone, tablet, PC or home automation system. The device can be used standalone on a local Wi-Fi network or via cloud-based home automation services.

When connected to the internet, the device can be accessed, controlled and monitored from anywhere with an internet connection.

The device works as a trailing-edge dimmer both with and without a neutral wire.

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Key features

• No neutral required: the device also works without a neutral wire.

• Bypass: required when the load is below 20 W and there is no neutral; helps prevent lamp flickering and ghost glow.

• Lighting groups: supported, but all devices in the group should be the same model and from the same manufacturer.

• Bluetooth: short-range data exchange with other Bluetooth devices.

• BLE Gateway: enables communication between BLE and Wi-Fi devices.

• Wi-Fi: connects to a wireless network.

• Wi-Fi range extender: repeats and extends the Wi-Fi signal range.

• Scripting: lets you create automation scripts.

• Basic schedules: weekly schedules and routines, including setting brightness, transition duration and dimming signal value.

• Advanced schedules: year-round scheduling from seconds to months.

• Auto on/off: lets you set automatic timers.

• Local actions: automation on the local network.

• Webhooks: event-based automation with other devices.

• Compatibility: compatible with third-party home automation systems.

• No hub required: works locally or via remote control.

• History log: stores the event history.

• KVS (Key-Value Store): persistent data storage.

• Safety: overvoltage protection, overload protection, overcurrent protection (protection may be limited without a neutral).

• Power metering: available only with a neutral.

• Night mode: sets the light brightness at night.

• Transition duration: controls the dimming time from 0–100% and back.

• Min/Max brightness limits: more precise brightness control.

• Button/switch control: single and double press, dimming speed, automatic calibration.

• Virtual components: components created dynamically by the user.

• KNX: KNXnet/IP support.

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Use cases

• Retrofit into an existing lighting system, even without a neutral.

• Brightness control of dimmable lamps.

• Smart schedules based on sunrise and sunset.

• Night mode with reduced brightness.

• Integration with Home Assistant, Google Home, Alexa and SmartThings.

• Improved security through automatic lighting on motion detection.

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Main applications

• Residential

• Apartments, hotels, MDU

• Small offices and small businesses

• Public sector, universities

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Integration

• Amazon Alexa: Yes

• Google Smart Home: Yes

• Samsung SmartThings: Yes

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Electrical interfaces

Inputs: 2 switch/button inputs (S1, S2) on screw terminals
Power inputs: 1 N and 2 L on screw terminals
Outputs: internally connected outputs on screw terminals (O)

Add-on interface: not supported

Connectivity: Wi-Fi, Bluetooth

Safety features:

• Overheating protection

• Overcurrent protection*

• Overvoltage protection*

• Undervoltage protection*

• works only with a neutral

Supported load types: dimmable LED, incandescent, halogen, low-voltage transformers, electronic transformer drivers (up to 200 W)

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User interface

• Inputs: control button

  • Hold for 5 s: Access Point and Bluetooth

  • Hold for 10 s: factory reset

• Outputs: LED indicator with different blink patterns depending on Wi-Fi and cloud connection status

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Physical specifications

• Dimensions: 38x42.5x16.5 mm

• Weight: 24.3 g

• Max screw terminal torque: 0.4 Nm

• Wire cross-section: 0.2–2.5 mm²

• Mounting: wall box

• Housing: plastic, colour: green, print: black

Environment:

• Operating temperature: -20 °C … 40 °C

• Humidity: 30–70 % RH

• Max altitude: 2000 m

Electrical specifications:

• Supply voltage: 220–240 V~ 50 Hz

• Power consumption: < 1.5 W

• Min. load without neutral and without bypass: 20 W

• Dimming: trailing edge

• Circuit protection: 16 A, B/C, 6 kA, class 3

Sensors and metering:

• Voltmeter 180–240 V, ±5% with neutral

• Ammeter 0–3 A, ±5% with neutral

• Internal temperature sensor: Yes

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Wireless connectivity

• Wi-Fi: 802.11 b/g/n, 2412–2472 MHz, <20 dBm, range 30 m indoors, 50 m outdoors

• Bluetooth: 4.2, 2402–2480 MHz, <4 dBm, range 10 m indoors, 30 m outdoors

Microcontrollers: ESP32 C3 and STM32 G051, 8 MB Flash

Firmware: schedules, webhooks, scripting, MQTT, advanced schedules, KVS

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Main wiring terminals

Terminal	Wire	Description
L (x2)	-	2 live inputs
L	-	Live 220–240 V~
N	-	Neutral
O (x2)	-	2 load outputs
S1, S2	-	Switch/button inputs for light control

User manual: Shelly Dimmer Gen3 multilingual printed user and safety guide.pdf Manufacturer's website: Shelly Dimmer Gen3 – smart dimmer