Description

Shelly 1 Gen4 – Powerful 16A Smart Relay with Dry Contacts

Bring intelligent control to almost any electrical circuit with the Shelly 1 Gen4, a compact and versatile 16A dry contact smart relay designed for modern home automation, commercial installations and DIY projects.

Unlike conventional smart switches, the Shelly 1 Gen4 uses potential-free (dry) relay contacts, allowing the switched circuit to remain electrically independent from the power supply used by the device.

This makes it suitable for everything from lights and appliances to garage doors, irrigation systems, contactors, gates, boilers, pumps and low-voltage control circuits.

With support for Wi-Fi, Zigbee, Matter and Bluetooth, the Shelly 1 Gen4 gives you the flexibility to choose how it connects to your smart home.

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16A High-Power Dry Contact Relay

The Shelly 1 Gen4 supports loads of up to 16A at 240V AC, making it suitable for a wide range of residential and commercial applications.

The potential-free dry contact can also be used to switch circuits that are separate from the relay’s own power supply.

This makes the Shelly 1 Gen4 particularly useful for:

• Lighting circuits
• Fans
• Appliances
• Garage door controllers
• Electric gates
• Irrigation systems
• Pumps
• Contactors
• Boilers
• Heating systems
• Doorbells
• Access-control systems
• Low-voltage control circuits
• Industrial control applications

For higher-power equipment, the Shelly 1 Gen4 can be used to control an appropriately rated contactor, allowing the smart relay to operate larger electrical loads safely.

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Four Wireless Technologies in One Device

The Shelly 1 Gen4 gives you unprecedented flexibility with four connectivity options:

Wi-Fi

Connect directly to your existing 2.4 GHz Wi-Fi network without requiring a dedicated hub.

Zigbee

Use the Shelly 1 Gen4 as part of a Zigbee smart home network with a compatible Zigbee coordinator or hub.

Matter

Enjoy broad smart home interoperability through Matter-compatible platforms and controllers.

Bluetooth

Bluetooth provides convenient device setup and also enables the Shelly 1 Gen4 to operate as a Bluetooth gateway for compatible Shelly devices.

This multiprotocol approach makes the Gen4 an excellent choice whether you’re building a new smart home or integrating it into an existing system.

Good to know: The Shelly 1 Gen4 ships in Matter mode by default. Switching to Zigbee mode (via a simple button sequence) disables Matter. Wi-Fi and Bluetooth stay active either way

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Matter Smart Home Compatibility

With Matter support, the Shelly 1 Gen4 can integrate with compatible smart home platforms including:

• Apple Home
• Google Home
• Amazon Alexa
• Samsung SmartThings
• Home Assistant
• Other Matter-compatible ecosystems

Create automations, control devices from your preferred smart home app, and integrate the relay into larger multi-brand smart home systems.

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Home Assistant Ready

The Shelly 1 Gen4 is particularly well suited to Home Assistant installations.

Use it to create powerful local automations such as:

Motion detected → Turn on lights

Door opens → Activate relay

Water leak detected → Shut off pump

Solar surplus available → Activate load

Time-of-use tariff begins → Enable geyser contactor

Because Shelly devices support local communication and a wide range of protocols, the Shelly 1 Gen4 provides excellent flexibility for advanced smart home installations.

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No Dedicated Hub Required with Wi-Fi

For Wi-Fi installations, the Shelly 1 Gen4 connects directly to your local network.

You can control the device through the Shelly Smart Control app, local web interface, compatible smart home platforms or automation systems.

No proprietary hub is required for basic Wi-Fi operation.

This makes it particularly easy to add smart functionality to an existing home without installing an entirely new ecosystem.

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Flexible Power Supply

The Shelly 1 Gen4 supports multiple power supply configurations:

• 110–240V AC
• 24–48V DC
• 12V DC

This makes it suitable for both conventional mains installations and specialised low-voltage applications.

The flexible power input is particularly useful for gate automation, irrigation, automotive-style projects, access control, alarm systems and other low-voltage installations.

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Compact Design for Retrofit Installations

Despite its extensive functionality, the Shelly 1 Gen4 measures only:

37 × 42 × 16 mm

Its compact enclosure allows it to fit behind many existing wall switches, sockets and electrical fixtures.

This makes it ideal for retrofitting smart functionality without changing the visible appearance of your installation.

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Advanced Smart Automation

The Shelly 1 Gen4 goes far beyond simple ON/OFF switching.

Create sophisticated automations using features including:

• Schedules
• Scenes
• Local actions
• Webhooks
• MQTT
• WebSockets
• HTTPS
• mJS scripting
• KNXnet/IP
• Virtual components

Advanced users can build highly customised automation systems while beginners can simply use the Shelly app or their preferred smart home platform.

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Zigbee Router & Bluetooth Gateway

The Shelly 1 Gen4 can provide additional functionality beyond controlling its connected load.

When configured appropriately, it can operate as:

• A Zigbee router, helping extend your Zigbee mesh network
• A Bluetooth gateway, connecting compatible Bluetooth devices to your network

This makes each Shelly Gen4 device potentially useful as part of your wider smart home infrastructure.

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Built-In Temperature Monitoring

An integrated temperature sensor monitors the device internally and provides overheating protection.

This helps protect the relay during demanding operating conditions and provides an additional layer of safety for long-term installations.

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Perfect for Home Automation & Electrical Control

The Shelly 1 Gen4 is an exceptionally versatile smart relay for both simple and advanced applications.

Smart Lighting

Convert existing lights into remotely controlled smart lights while retaining your physical wall switch.

Garage Doors & Gates

Use the dry contact output to trigger compatible gate and garage door controllers.

Irrigation

Automate pumps, valves and irrigation controllers using schedules, sensors or smart home scenes.

Geyser & Heating Control

Use the Shelly relay to control an appropriately rated contactor for high-power geysers, heaters or other electrical loads.

Solar & Energy Automation

Integrate the relay into energy-management systems to switch compatible loads based on solar generation, battery state or electricity tariffs.

Commercial & Industrial Applications

Use dry-contact switching for equipment control, automation panels, contactors and other specialised applications.

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Technical Specifications

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Why Choose the Shelly 1 Gen4?

The Shelly 1 Gen4 combines the flexibility of a dry-contact relay with the connectivity of Wi-Fi, Zigbee, Matter and Bluetooth.

Its 16A switching capacity, multiple power-supply options and compact design make it suitable for everything from everyday smart lighting to specialised low-voltage control applications.

Whether you’re building a Home Assistant smart home, upgrading an existing electrical installation, automating a gate or irrigation system, or controlling a contactor for a high-power appliance, the Shelly 1 Gen4 provides a flexible and future-ready solution.

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Installation & Safety

A neutral wire is required for powering the Shelly 1 Gen4. Electrical installation should be performed by a suitably qualified electrician and in accordance with applicable local regulations.

For higher-power loads, the Shelly 1 Gen4 should be used with an appropriately rated contactor or switching device where required. External 16A circuit protection is recommended.

Always verify the voltage, current, load type and switching requirements before installation.