Shelly Dimmer Gen3
Device image(s)
Device identification
- Device name: Shelly Dimmer Gen3
- Device model: S3DM-0A101WWL
- Device SSID: ShellyDimmerG3-XXXXXXXXXXXX
- Device Bluetooth ID: 0x1073
Short description
The Shelly Dimmer Gen3 is a single-channel smart dimming controller that enables remote control of dimmable lights and dimming drivers via smartphone, tablet, PC, or home automation systems. It operates standalone in a local Wi-Fi network or integrates with cloud-based home automation services. The device can be accessed, controlled, and monitored remotely from any location with internet connectivity, provided it remains connected to the Internet. It features an embedded Web Interface for configuration, monitoring, and settings adjustment. 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: Operates without a neutral wire.
- Bypass requirement: Required when used without neutral and load is under 20 W. Helps eliminate residual light when the lamp is off.
- Groups of lights: Supports grouping multiple lights, but all lights in a group must have identical power consumption (same model and manufacturer).
- Bluetooth: Complies with Bluetooth standard for short-range data exchange with other Bluetooth devices.
- BLE Gateway: Facilitates communication between BLE and Wi-Fi-enabled devices.
- Wi-Fi: Connects to wireless networks.
- Wi-Fi Range extender: Repeats and extends Wi-Fi signal coverage.
- Scripting: Enables creation of custom automation scenarios using scripts.
- Basic Schedules: Supports weekly schedules and routines, including brightness, transition duration, and dimming signal flip value settings.
- Advanced Schedules: Offers detailed year-round scheduling with time adjustments ranging from seconds to months, including brightness, transition duration, and flip value configurations.
- Auto on/off timers: Allows setting automatic on/off times.
- Local actions: Supports automation within the local Wi-Fi network, including brightness, transition duration, and flip value adjustments.
- Webhooks: Enables lightweight, event-driven automation with external devices.
- Compatibility: Fully 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: Maintains a detailed history of device events.
- KVS (Key-Value Storage): Provides persistent storage for key-value pairs.
- Safety: Includes overcurrent, overvoltage, and overpower protection. These protections may not function properly when used without a neutral wire.
- Power measurement:
- Voltage (V), current (A), and power (W) are measurable only when used with a neutral wire.
- Power consumption cannot be measured without a neutral wire.
- Night Mode: Enables setting a predefined brightness level during nighttime hours.
- Transition duration: Controls dimming speed from 0% to 100% on turn-on and from 100% to 0% on turn-off.
- Minimum brightness on toggle On: Sets the minimum brightness (in %) applied when turning on if current brightness is below the threshold. Default: 3%. Not applied when explicit transitions are defined in schedules or actions.
- Min/Max brightness: Adjusts the dimming range for finer control over output brightness.
- Switch/Button input mode: Offers flexible input control via switches and/or buttons:
- One-button dimming
- Dual-button dimming
- Button fade rate: Controls how quickly brightness changes while holding a button. Default: 3x.
- Button presets: Defines the brightness state triggered by a double-click. Default: 100%.
- Automatic dimming calibration: Ensures smooth dimming across the full range. Must be performed after initial setup, factory reset, or when changing the load.
- On new or factory-reset devices, calibration starts on the first toggle (via physical switch/button, mobile app, local web UI, or RPC command).
- Manual initiation: Simultaneous long-press of both buttons for 5 seconds. Calibration lasts up to 2 minutes.
- Success: Light turns on for 10 seconds, then turns off.
- Failure: Light flashes 5 times (1 sec ON / 1 sec OFF).
- Factory reset via switch/button: Perform 5 consecutive toggles within 60 seconds after power-up to trigger a factory reset.
- Virtual components: User-created dynamic components that do not exist physically on the device.
- KNX: Supports KNXnet/IP communication.
Use cases
- Retrofit existing lighting systems even without a neutral wire, preserving current switches and wiring.
- Precisely control brightness of dimmable lights for optimal ambiance.
- Create smart schedules to automatically adjust lighting throughout the day.
- Sync lighting with sunrise and sunset times using intelligent scheduling.
- Enable night mode for reduced brightness during nighttime.
- Integrate with third-party platforms such as Home Assistant, Google Home, Alexa, and SmartThings.
- Dim lights up or down with single or double button presses.
- Enhance safety by triggering lights automatically when motion is detected via Shelly Motion.
Main applications
- Residential
- MDU (Multi Dwelling Units – apartments, condos, hotels, etc.)
- Light commercial (small offices, retail stores, restaurants, gas stations, etc.)
- Government/municipal
- University/college
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: one N and two L
Outputs
- Internally bridged output on screw terminal: O
Add-on interface
Not supported
Connectivity
- Wi-Fi
- Bluetooth
Safety functions
- Overheating protection
- Overpower protection*
- Overvoltage protection*
- Undervoltage protection*
- Overcurrent protection
* Only functional 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 transformers 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 to enable Access Point and Bluetooth connection.
- Press and hold for 10 seconds to perform a factory reset.
Outputs
- Monochrome LED indicator:
- AP enabled, Wi-Fi disabled: 1 sec ON / 1 sec OFF
- Wi-Fi enabled, not connected: 1 sec ON / 3 sec OFF
- Connected to Wi-Fi network: Constantly ON
- Cloud enabled, not connected: 1 sec ON / 5 sec OFF
- Connected to Shelly Cloud: Constantly ON
- OTA (Over-the-Air Update): 0.5 sec ON / 0.5 sec OFF
- Button pressed and held for 5 seconds: 0.5 sec ON / 0.5 sec OFF
- Button pressed and held for 10 seconds: 0.25 sec ON / 0.25 sec OFF
Note: States are prioritized from top to bottom. Each subsequent state overrides the previous one.
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 | 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, bootlace ferrules) |
| Conductor stripped length | 5 to 6 mm / 0.20 to 0.24 inch |
| 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 without 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 measurements require use with a neutral wire.
| Radio | | | Wi-Fi | | | Protocol | IEEE 802.11 b/g/n | | RF band | 2412 – 2472 MHz | | Max. RF power | < 20 dBm | | Range | Up to 30 m indoors / 50 m outdoors
(Depends on local conditions) |
| Bluetooth | | | Protocol | Bluetooth 4.2 | | RF band | 2402 – 2480 MHz | | Max. RF power | < 4 dBm | | Range | Up to 10 m indoors / 30 m outdoors
(Depends on local conditions) |
| Microcontroller unit | | | CPU | ESP32 C3 + STM32 G051 | | Clock frequency | ESP32 C3: 40 MHz | | Flash memory | 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
Fig. 1 – With Neutral
Fig. 2 – Without Neutral, with Bypass
Legend
Terminals
- L (x2): Two live terminals
- N: Neutral terminal
- O (x2): Two output terminals to the load
- S1, S2: Switch/button input terminals for light control
Wires
- L: Live (220–240 V~) wire
- N: Neutral wire
Shelly Smart Control
Shelly Web user interface
Components and APIs
Compliance
- Shelly Dimmer Gen3 multilingual EU declaration of conformity 2025-07-22.pdf
- Shelly Dimmer Gen3 UK PSTI ACT Statement of compliance.pdf
Compliance archive
Printed user guide
Shelly Dimmer Gen3 multilingual printed user and safety guide.pdf
Installation guides
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