Shelly Dimmer GEN4 - Matter, WiFi, Bluetooth, Zigbee - Dimming Module

Shelly Dimmer Gen4 – Ultra-slim smart dimmer for no-neutral retrofits

Shelly Dimmer Gen4 is a next-generation in-wall dimming module that turns almost any light circuit into intelligent, precisely controlled smart lighting. Thanks to its advanced Shelly Gen4 chip, multi-protocol connectivity, and operation with or without a neutral wire, it is ideal for renovations, new builds, and deep smart home integrations.

The module hides behind your existing wall switch, supports a wide range of dimmable light sources, and communicates over Wi-Fi, Bluetooth, Zigbee and Matter. Use it as a stand-alone smart dimmer or integrate it into complex automation scenarios with leading smart home platforms, voice assistants and professional building systems.

Key smart lighting features

• Works with or without neutral; Shelly Bypass required if load < 20 W on no-neutral installations
• Multi-protocol connectivity: built-in Wi-Fi, Bluetooth, Zigbee and Matter certification
• Supported loads: dimmable LED up to 150 W, incandescent/halogen up to 200 W, iron-core transformers up to 200 VA, dimmable electronic transformers up to 200 W
• Trailing-edge dimming technology for smooth, flicker-reduced light control
• Fine tuning of minimum/maximum brightness, button fade rate and transition duration (On/Off fade time)
• Full smart control via Shelly Smart Control app, web interface, HTTP, MQTT and scenes
• Deep ecosystem integration: Matter, Home Assistant, Amazon Alexa, Google Home, Apple HomeKit, Samsung SmartThings
• Supports KNXnet/IP communication for professional building automation projects
• Works with existing wall switches and push buttons for intuitive local control

Smart automation and comfort

• Create daily and weekly lighting schedules (up to 20) tailored to your routines
• Sync brightness with sunrise and sunset for natural, adaptive indoor lighting
• Build smart scenes linking Shelly Dimmer Gen4 with motion sensors, door sensors or other Shelly devices
• Use night mode and custom brightness levels for bedrooms, hallways and children’s rooms
• Remote access and monitoring via Shelly cloud or local-only control for privacy-focused installations

Physical parameters

• Mounting: in-wall, behind standard switches
• Dimensions (HxWxD): 38.5 x 43.5 x 17 mm (1.52 x 1.71 x 0.67 in)
• Weight: 24.3 g (0.86 oz)
• Terminal torque (max.): 0.4 Nm / 3.5 lbf·in
• Conductor cross section: 0.2–2.5 mm² / 24–14 AWG (solid, stranded, ferrules)
• Stripping length: 5–6 mm (0.20–0.24 in)
• Housing material: plastic, lime shell with black print and grey connectors

Environmental ratings

• Operating temperature: -20 °C to 40 °C (-5 °F to 105 °F)
• Relative humidity: 30–70 % RH (non-condensing)
• Maximum installation altitude: 2000 m / 6562 ft

Electrical characteristics

• Power supply: 220–240 V~ 50 Hz
• Own power consumption: < 1.5 W
• Neutral required: no (supports both neutral and no-neutral wiring)
• Minimum load without neutral and without Bypass: 20 W
• Dimming type: trailing edge
• Max. output power: 200 W
• Max. output current: 0.85 A
• Recommended external protection: 16 A breaker, B or C curve, 6 kA, energy limiting class 3

Measurement and safety

• AC voltmeter range: 180–280 V, accuracy ±5 % (with neutral)
• AC ammeter range: 0–3 A, accuracy ±5 % (with neutral)
• Integrated internal temperature sensor for protection and monitoring
• Precise energy measurement available only when used with neutral conductor

Wireless connectivity

• Wi-Fi: IEEE 802.11 b/g/n/ax, 2.4 GHz band (2401–2483 MHz), RF power < 20 dBm
• Wi-Fi range: up to 30 m indoors / 50 m outdoors (depending on environment)
• Bluetooth 5.0: 2400–2483.5 MHz, RF power < 4 dBm; range up to 10 m indoors / 30 m outdoors
• Zigbee: IEEE 802.15.4, 2400–2483.5 MHz, RF power < 20 dBm
• Zigbee router/repeater function for strengthening mesh networks

Processing and firmware

• MCU: ESP-Shelly-C68F + STM32 G051
• Clock frequency: 40 MHz
• Flash memory: 8 MB for firmware and user features
• Up to 20 schedules and 20 webhooks (up to 5 URLs per hook)
• Supports scripting for custom logic and advanced automation
• MQTT support for direct integration with home automation servers

Typical applications

• Smart dimming of living rooms, kitchens, bedrooms and home offices
• Atmospheric lighting in hospitality: restaurants, bars, cafés, hotels
• Hallways and staircases with motion-triggered lighting using Shelly BLU Motion
• Retrofit projects where no neutral wire is present in the switch box
• Energy-aware households requiring precise control and monitoring of lighting circuits