Shelly Shelly 1 Gen4 Smart Relay Switch — Wi-Fi, Zigbee & Matter, 16A Dry Contacts for Lights & Garage

Whether you are retrofitting an older home or upgrading a modern installation, the Shelly 1 Gen4 packs multi‑protocol connectivity and a single 16A relay into a tiny module designed to tuck behind switches, inside sockets or within small junction boxes. It also acts as a Bluetooth gateway for improved device discovery and local control through the Shelly Smart Control app, giving you schedules, scenes and remote access from anywhere.

What devices and loads can Shelly 1 Gen4 control?

The Shelly 1 Gen4 handles a wide range of electrical loads using its single 16A channel and dry contact interface. It’s suitable for lamps, motorized gates, garage door openers, small pumps and other low‑to‑medium power devices where isolated switching is required. Use the dry contacts to safely integrate with systems that must remain electrically isolated from the relay supply.

• Single 16A channel for resistive and inductive loads
• Dry contacts let you switch circuits without sharing power lines
• Compatible with 12V and 24–48V DC systems for garage doors and gate controls
• Works with reed sensors and Shelly Plus Add‑on for state monitoring

How easy is installation in tight spaces and existing switch boxes?

Shelly designed the Gen4 with compact dimensions so it fits behind standard wall switches, inside power sockets and into narrow junction boxes for discrete retrofit projects. You can mount it near the load or inside the switch cavity, and typical wiring follows existing live/neutral and output lines. No additional hub is required for Wi‑Fi operation, though Zigbee and Matter give extra integration options.

• Small form factor fits most UK/EU/US style boxes
• Standard screw terminals for straightforward wiring
• No hub needed for Wi‑Fi; optional Zigbee/Matter for ecosystem compatibility
• Acts as a Bluetooth gateway to improve local device setup

Which smart home platforms and voice assistants does it work with?

Shelly 1 Gen4 integrates with mainstream smart ecosystems so you can control devices by voice or automation. Native support and official integrations make it straightforward to add to Amazon Alexa, Google Home, Home Assistant and Samsung SmartThings, while Matter compatibility helps future‑proof cross‑brand device communication. Use the Shelly Smart Control app for scheduling, remote control and push notifications.

• Works with Amazon Alexa and Google Home for voice commands
• Integrates with Home Assistant and Samsung SmartThings
• Matter support eases multi‑brand automations and scene sharing
• Configure remotely via the Shelly Smart Control app

Who is this for? Installers, DIYers and tech‑minded homeowners who need a small, flexible relay to add smart control to lights, gates, garage doors and other appliances will find the Shelly 1 Gen4 particularly useful. It suits retrofit jobs where space is limited, projects that require dry contact isolation, and smart home setups that benefit from Wi‑Fi plus Zigbee and Matter interoperability. Shelly’s three‑year warranty and app‑driven configuration make it a practical choice for professional electrical work and hobbyist automation alike.