Shelly 1 Mini Gen4 Compact Smart Relay for Home Automation

The Shelly 1 Mini Gen4 is an ultra-compact smart relay switch that brings intelligent control to your home automation setup. It lets you manage lights and small appliances up to 8A, with WiFi, Bluetooth, Zigbee, and Matter support. It fits into confined spaces, which is the point of the Mini line.

The Short Version

The Shelly 1 Mini Gen4 is the Gen4 version of Shelly's smallest relay, now with Zigbee and Matter next to Wi-Fi and Bluetooth. It measures 29 x 34 x 16 millimeters and weighs about 19 grams, and it is designed for installation in standard electrical wall boxes, behind power sockets, light switches, or other space-limited locations. The compact form factor doesn't compromise functionality-it supports loads up to 8A at 240 VAC (2000 W) or 5A at 30 VDC, which covers most lighting and small appliances.

It's a dry contact (potential-free) relay, so it switches the circuit without supplying voltage to the load. Shelly lists resistive, capacitive and inductive loads as supported, including LED light drivers, transformers and fans. Check the 8A figure against your load's inrush current, because LED drivers and motors can pull far more than their rated draw at switch-on.

Multiprotocol Connectivity Features

WiFi operates on 802.11 b/g/n/ax at 2412 to 2472 MHz, with a quoted range of up to 30 meters indoors and 50 meters outdoors. Bluetooth 5.0 is quoted at 10 meters indoors and 30 meters outdoors, and Zigbee 802.15.4 at 100 meters indoors and 300 meters outdoors. Those are open-air figures from the spec sheet, and walls cut them hard.

Shelly's knowledge base says the relay is compatible with Matter, with Matter as the default mode. It doesn't name the Matter transport on that page, and it doesn't say whether Zigbee and Wi-Fi can run at the same time, so confirm both before you plan around them. Pressing the button five times starts Zigbee inclusion for 3 minutes. The device also has a local web interface and optional cloud access for remote access.

Technical Specifications and Performance

The Shelly 1 Mini Gen4 operates from a 110-240V AC power supply with power consumption below 1.2 watts, making it energy-efficient for continuous operation. The NO (normally open) dry relay accepts conductors from 0.5 to 4 mm2 (20 to 11 AWG), stripped 6-7 mm, with a screw terminal torque of 0.4 Nm.

Environmental specifications include operating temperatures from -20°C to 40°C (-5°F to 105°F) and humidity tolerance between 30% to 70% RH. The device functions at altitudes up to 2000 meters (6562 feet). Shelly specifies external protection with tripping characteristic B or C, a maximum rated current of 10A and a minimum 6 kA interrupting rating.

Processing power comes from an ESP-Shelly-C68F CPU with 8MB flash memory. The device supports 20 schedules and 20 webhooks with five URLs per hook, MQTT protocol for smart home integration, and JavaScript scripting capabilities for custom automation logic.

Smart Home Integration and Control

Shelly lists support for Alexa, Google Smart Home and Samsung SmartThings, plus automation routines in those apps. The embedded web interface works on your local network, and remote access goes through Shelly's cloud.

Configuration happens in the Shelly app or the local web dashboard, and you can group several Shelly devices into scenes.

Key features include:

Key Points

• Multiprotocol connectivity supporting WiFi, Bluetooth, Zigbee, and Matter standards
• Dry contact relay compatible with resistive, capacitive, and inductive loads
• Remote access via cloud connectivity and local web interface
• Compact design fitting standard wall boxes and confined spaces
• Advanced automation through scheduling, webhooks, and JavaScript scripting
• Voice control through Alexa, Google Smart Home and SmartThings

How People Use It

The typical job is retrofitting an existing light circuit to add smart control without replacing fixtures. Install it behind a wall switch or socket to convert ordinary lamps into smart lighting, or use it for exhaust fans and other small loads within the 8A rating.

Integrate multiple units throughout your home to create coordinated scenes-for example, turning off all lights simultaneously or adjusting different room temperatures through a single command. Because the contact is potential-free, it can also close a low-voltage circuit such as a gate or doorbell input, within the 5A at 30 VDC rating. Scripting makes simple presence-simulation schedules possible. It mounts in a standard wall box, so the install is a job for someone allowed to work on mains wiring, not a renter's plug-in.

Getting Started and Installation

Begin by turning off power to the circuit where installation will occur. Strip conductor wires to 6-7 millimeters (0.24-0.28 inches) and connect them to the screw terminals at 0.4 Nm. After power-up, Matter is the default; Shelly's knowledge base describes five presses of the button to switch to Zigbee inclusion.

Download the Shelly mobile application or access the cloud dashboard to configure automations, schedules, and integrations. The reset button gives you a factory reset with a 10-second press, which helps with troubleshooting. Local web interface access at the device's IP address offers an alternative control method without cloud dependency.

Ecosystem Flexibility and Future-Proofing Strategy

The Shelly 1 Mini Gen4 carries Wi-Fi, Bluetooth, Zigbee and Matter, so you can pick the protocol that matches your hub instead of buying a different relay per ecosystem. That helps in homes with devices from several manufacturers: HomeKit-native products coexist with Home Assistant installations and Alexa ecosystems, and the Shelly Home Assistant integration guide shows the local route. The local web interface, scripting and MQTT mean you don't have to depend on the cloud. Shelly lists MQTT support and scripting on the spec sheet; we haven't run this relay on a long-term local-only setup.

Advanced Integration and Custom Automation

Beyond on/off control, the relay supports custom automation logic through JavaScript scripting and webhooks. The spec sheet gives 20 schedules and 20 webhooks with five URLs per hook, which is enough for Node-RED flows or other services. Paired with other Shelly devices that have sensors, it can take part in simple rules. The MQTT protocol support lets other platforms such as Home Assistant read and command it directly.

Should You Buy It

The Shelly 1 Mini Gen4 is a small compact smart relay that fits behind a switch or socket and speaks Wi-Fi, Bluetooth, Zigbee and Matter. It's a good fit for lighting and small loads up to 8A. It doesn't fit heavy loads such as electric heaters or big motors, where you need a contactor or a higher-rated relay. This page is based on Shelly's published specifications, not hands-on testing.