Shelly Dimmer Gen3 Smart WiFi LED Dimmer Switch
The Shelly Dimmer Gen3 is a single-channel smart dimming controller that enables remote control of dimmable lights and dimming drivers through your smartphone, tablet, PC, or home automation system. Powered by Shelly's own custom chip, it offers precise and reliable dimming control with or without a neutral wire, making it perfect for retrofitting existing lighting installations without rewiring. Integrate seamlessly with Home Assistant, Google Home, Alexa, and SmartThings for complete smart home control.
Key Features
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No Neutral Wire Required: Install in existing light switches without a neutral connection (bypass required for loads under 20W)
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WiFi & Bluetooth Connectivity: WiFi 802.11 b/g/n (2.4 GHz) plus Bluetooth BLE 5.0 for seamless pairing and BLE gateway functionality
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Wide Compatibility: Supports dimmable LED lamps up to 150W, incandescent and halogen lamps up to 200W, and electronic transformers up to 200W
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Smart Scheduling & Night Mode: Automate brightness throughout the day and set reduced brightness for nighttime hours
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Trailing Edge Dimming: Advanced dimming technology for smooth, flicker-free light control
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Compact Design: Ultra-small footprint (38 × 42.5 × 16.5 mm) fits easily behind existing switches
No Hub Required - Total Flexibility
The Shelly Dimmer Gen3 operates independently without requiring a proprietary hub or subscriptions. Control your lights locally via your WiFi network using the Shelly Smart Control app, web interface, or through cloud-based home automation platforms. Advanced users can leverage scripting capabilities for custom automation scenarios and integrate with webhooks and MQTT for professional installations.
Smart Home Integration
Enjoy expanded control options by integrating with third-party systems including Home Assistant, Google Home, Alexa, and SmartThings. Dim lights up or down with a single or double button press, create actions to turn lights on automatically when motion is detected, and sync lighting schedules with sunrise and sunset times.
Advanced Monitoring & Safety
When used with a neutral wire connection, the Dimmer Gen3 provides power monitoring with measurements of voltage (V), current (A), and power consumption (W). Built-in safety features include overcurrent, overvoltage, and overpower protection, plus an internal temperature sensor to prevent overheating. The device maintains a detailed activity log of all events for troubleshooting and analysis.
Installation & Compatibility
Designed for in-wall mounting and suspended ceilings, the Dimmer Gen3 features screw terminals compatible with conductor cross-sections from 0.2 to 2.5 mm² (24 to 14 AWG), supporting solid, stranded, and bootlace ferrules. Works with standard wall switches and supports both single and dual-button configurations for versatile control options.
What's in the Box
- Shelly Dimmer Gen3 device
- User guide
Full Specifications
Physical
| Dimensions (H × W × D) |
38 × 42.5 × 16.5 mm (1.50 × 1.67 × 0.65 inch) |
| Weight |
24.3 g (0.86 oz) |
| Mounting |
In-wall, suspended ceilings |
| Shell Material |
Plastic (Lime shell, black print, black connectors) |
Electrical
| Power Supply |
AC 110-240V ±10%, 50/60Hz |
| Power Consumption |
< 1.5 W |
| Neutral Wire |
Not required |
| Dimmer Type |
Trailing edge |
| Max LED Power |
150 W |
| Max Incandescent/Halogen Power |
200 W |
| Max Electronic Transformer Power |
200 W |
| Bypass Requirement |
Required when used without neutral and load is under 20 W |
Connectivity
| WiFi |
802.11 b/g/n, 2.4 GHz (2401-2495 MHz) |
| Bluetooth |
BLE 5.0 |
| BLE Gateway |
Yes (for BLU devices) |
| WiFi Range Extender |
Yes |
| Max RF Power |
< 20 dBm |
Smart Features
| CPU |
ESP-Shelly-C38F |
| Flash Memory |
8 MB |
| Schedules |
20 |
| WebHooks (URL Actions) |
20 with 5 URLs per hook |
| Scripting |
Yes |
| MQTT |
Yes |
| Encryption |
TLS 1.2 |
| Matter Support |
Yes (firmware v1.6.0 or newer) |
Environmental
| Operating Temperature |
-20°C to 40°C (-5°F to 105°F) |
| Humidity |
30% to 70% RH |
| Max Altitude |
2000 m (6562 ft) |
Installation
| Screw Terminals Max Torque |
0.4 Nm (3.5 lbin) |
| Conductor Cross Section |
0.2 to 2.5 mm² / 24 to 14 AWG |
| Conductor Stripped Length |
5 to 6 mm (0.20 to 0.24 inch) |
Warranty & Support
| Warranty Period |
3 years |
| Device Model |
S3DM-0A101WWL |
| Bluetooth ID |
0x1073 |
Specifications are sourced from the manufacturer product page and may be updated.
