Device image(s)
Device identification
- Device name: Shelly Dimmer Gen3
- Device model: S3DM-0A101WWL
- Device SSID: ShellyDimmerG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1073
Short description
Shelly Dimmer Gen3 is a single-channel smart dimming controller that allows remote control of dimmable lights and dimming drivers via mobile phone, tablet, PC, or home automation systems. It can operate standalone in a local Wi-Fi network or be managed through cloud-based home automation services. The device supports remote access, control, and monitoring from anywhere with internet connectivity, provided it's connected to the Internet.
It features an embedded Web Interface for monitoring and configuring settings. The device functions as a trailing-edge dimmer switch and can be used with or without a neutral wire.
Main features
- No need for neutral: Can be used without a neutral wire.
- Bypass: Required when used without neutral and load is under 20 W. Helps prevent residual light when off.
- Groups of lights: Supported, but all lights must have identical power consumption (same model and manufacturer).
- Bluetooth: Complies with Bluetooth standard for short-range data exchange.
- BLE Gateway: Enables communication between BLE and Wi-Fi devices.
- Wi-Fi: Connects to wireless networks.
- Wi-Fi Range Extender: Repeats and extends Wi-Fi signal coverage.
- Scripting: Supports custom automation via scripts.
- Basic Schedules: Weekly schedules with brightness, transition duration, and dimming signal flip value.
- Advanced Schedules: Year-round detailed scheduling with time adjustments from seconds to months.
- Auto on/off timers: Allows setting automatic on/off times.
- Local actions: Automation within the local network.
- Webhooks: Lightweight, event-driven integration with other devices.
- Compatibility: Highly compatible with third-party home automation platforms.
- No hub required: Ready for use locally or remotely via Shelly Smart Control or third-party systems.
- Activity log: Stores detailed event history.
- KVS (Key-value storage): Persistent storage for key-value pairs.
- Safety: Overcurrent, overvoltage, and power protection — may not function properly without neutral wire.
- Power measurement:
- Voltage (V), current (A), and power (W) displayed only when used with neutral.
- Power consumption cannot be measured without neutral.
- Night Mode: Set specific brightness levels during nighttime hours.
- Transition duration: Controls dimming speed from 0% to 100% (on) and 100% to 0% (off).
- Minimum brightness on toggle On: Default 3%. Applies when turning on if current brightness is below this level (not applied with explicit transitions).
- Min/Max brightness: Adjusts dimming range for finer control.
- Switch/Button input mode: Flexible control using one or two buttons:
- One-button dimming
- Dual-button dimming
- Button fade rate: Controls how fast brightness changes while holding button(s). Default: 3x.
- Button presets: Default state after double-click: 100%.
- Automatic dimming calibration: Ensures smooth dimming across full range. Must be performed:
- On new devices
- After factory reset
- After changing the load
- Starts automatically on first toggle (physical switch, app, web UI, or RPC command)
- Or manually by long-pressing both buttons simultaneously for 5 seconds
- Calibration lasts up to 2 minutes:
- Success: Light turns on for 10 seconds, then off
- Failure: Light flashes 5 times (1 sec ON / 1 sec OFF)
- Factory reset through switch/button: 5 consecutive toggles within 60 seconds after power-up.
- Virtual components: Dynamically created user-defined components.
- KNX: Supports KNXnet/IP communication.
Use cases
- Retrofit existing lighting systems even without a neutral wire, preserving current switches and wiring.
- Fine-tune light brightness for optimal ambiance.
- Create smart schedules for automated brightness adjustments throughout the day.
- Sync lighting with sunrise/sunset times using intelligent schedules.
- Enable night mode for reduced brightness at night.
- Integrate with third-party systems like Home Assistant, Google Home, Alexa, and SmartThings.
- Control dimming with single or double button presses.
- Enhance safety by triggering lights automatically when motion is detected via Shelly Motion.
Main applications
- Residential
- Multi Dwelling Units (apartments, condos, hotels, etc.)
- Light commercial (small offices, retail stores, restaurants, gas stations, etc.)
- Government/municipal projects
- University/college facilities
Integrations
Amazon Alexa supported capabilities
Yes
Google Smart Home supported traits
Yes
Samsung SmartThings supported capabilities
Yes
Simplified internal schematics
Device electrical interfaces
Inputs
- Two switch/button inputs on screw terminals: S1 and S2
- Three power supply inputs on screw terminals: N and two L
Outputs
- Internally bridged output terminals: O
Add-on interface
Not supported
Connectivity
- Wi-Fi
- Bluetooth
Safety functions
- Overheating protection
- Overpower protection*
- Overvoltage protection*
- Undervoltage protection*
- Overcurrent protection
*Works only when used with a neutral wire.
Supported load types
- Dimmable LED lamps: up to 150 W
- Incandescent bulbs: up to 200 W
- Halogen lamps: up to 200 W
- Iron-core transformer with low-voltage incandescent lamps: up to 200 VA
- Dimmable electronic transformers: up to 200 W
User interface
Inputs
- One (Control) button:
- Press and hold for 5 seconds → Enable device access point and Bluetooth
- Press and hold for 10 seconds → Factory reset
Outputs
- Monochrome LED indicator:
- AP enabled, Wi-Fi disabled: 1 sec ON / 1 sec OFF
- Wi-Fi enabled but not connected: 1 sec ON / 3 sec OFF
- Connected to Wi-Fi network: Constantly ON
- Cloud enabled but not connected: 1 sec ON / 5 sec OFF
- Connected to Shelly Cloud: Constantly ON
- OTA update in progress: ½ sec ON / ½ sec OFF
- Button pressed and held for 5 seconds: ½ sec ON / ½ sec OFF
- Button pressed and held for 10 seconds: ¼ sec ON / ¼ sec OFF
Note: Higher-priority states override lower ones.
Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (H×W×D) | 38 × 42.5 × 16.5 mm / 1.50 × 1.67 × 0.65 inch |
| Weight | 24.3 g / 0.86 oz |
| Screw terminals max torque | 0.4 Nm / 3.5 lbin |
| Conductor cross section | 0.5 to 4 mm² / 20 to 11 AWG (solid, stranded, bootlace ferrules) |
| Conductor stripped length | 5 to 6 mm / 0.20 to 0.24 in |
| Mounting | In-wall |
| Shell material | Plastic |
| Shell color | Lime |
| Print color | Black |
| Connector color | Black |
| Environmental | |
| Ambient working temperature | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity | 30% to 70% RH |
| Max. altitude | 2000 m / 6562 ft |
| Electrical | |
| Power supply | 220–240 V~ 50 Hz |
| Power consumption | < 1.5 W |
| Neutral not needed | Yes |
| Min. load without neutral and bypass | 20 W |
| Dimming type | Trailing edge |
| External protection | 16 A, tripping characteristic B or C; 6 kA interrupting rating; Energy limiting class 3 |
| Short circuit protection | Yes |
| Output circuits ratings | |
| Max. output power | 200 W |
| Sensors, meters* | |
| Voltmeter range (AC) | 180 V – 240 V |
| Voltmeter accuracy | ±5% (when used with neutral) |
| Ammeter range (AC) | 0 A – 3 A |
| Ammeter accuracy | ±5% (when used with neutral) |
| Internal temperature sensor | Yes |
| * | Precise measurement only possible when used with neutral |
| Radio | |
| Wi-Fi | |
| Protocol | 802.11 b/g/n |
| RF band | 2412 – 2472 MHz |
| Max. RF power | < 20 dBm |
| Range | Up to 30 m indoors / 100 ft; up to 50 m outdoors / 160 ft (Depends on local conditions) |
| Bluetooth | |
| Protocol | 4.2 |
| RF band | 2402 – 2480 MHz |
| Max. RF power | < 4 dBm |
| Range | Up to 10 m indoors / 33 ft; up to 30 m outdoors / 100 ft (Depends on local conditions) |
| Microcontroller unit | |
| CPU | ESP32 C3, STM32 G051 |
| Clock frequency | ESP32 C3: 40 MHz |
| Flash | 8 MB |
| Firmware capabilities | |
| Schedules | 20 |
| Webhooks (URL actions) | 20 with up to 5 URLs per hook |
| Scripting | Yes |
| MQTT | Yes |
| Advanced schedules | Yes |
| KVS (Key-Value Store) | Yes |
Basic wiring diagrams
| With Neutral | Without Neutral, with Bypass |
|---|---|
 |  |
| Fig. 1 - With Neutral | Fig. 2 - Without Neutral, with Bypass |
Legend
| Terminals | Description | Wires | Description |
|---|---|---|---|
| L (x2) | Two live terminals | L | Live (220–240 V~) wire |
| N | Neutral terminal | N | Neutral wire |
| O (x2) | Two output terminals to the load | ||
| S1, S2 | Switch/button input terminals for light control |
Shelly Smart Control
Shelly Web user interface
Components and APIs
Compliance
- Shelly Dimmer Gen3 multilingual EU declaration of conformity (2025-07-22)
- Shelly Dimmer Gen3 UK PSTI ACT Statement of compliance
Compliance archivePrinted user guide
Installation guides
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