Shelly 1 Gen4
Overview
Shelly 1 Gen4 is a compact, single-channel smart relay with potential-free (dry contact) output, designed for controlling a wide range of electrical loads up to 16A. Its dry contact design makes it suitable for switching low-voltage and high-voltage circuits, contactors, gates, garage doors, boilers, and other control circuits where voltage isolation is required.
With multiprotocol support including Wi-Fi, Zigbee, Bluetooth, and Matter, Shelly 1 Gen4 can operate either without a hub or as part of a larger smart home system. Its small form factor allows for easy retrofitting behind wall switches or sockets, while the upgraded Gen4 processor delivers faster response times, improved reliability, and smoother automation performance.
Key Features
• Single-channel relay rated up to 16A with dry contact (potential-free) output
• Suitable for switching AC and DC loads with voltage isolation
• Multiprotocol connectivity: Wi-Fi, Zigbee, Bluetooth, Matter
• Matter-certified with Apple Home support via Matter
• Compact design for retrofitting behind switches and sockets
• Supports AC and low-voltage DC power supply
• Acts as a Wi-Fi and Zigbee range extender and Bluetooth gateway
• Smart schedules, scenes, and local automation
• Advanced integrations via HTTPS, MQTT, WebSockets, UDP, and KNXnet/IP
• Supports custom scripting for advanced automation logic
Technical Specifications
Power Supply (AC): 110–230 V ±10%, 50/60 Hz
Power Supply (DC): 24–48 V DC, 12 V DC (stabilized)
Max Switching Voltage: 240 V AC / 30 V DC
Max Switching Current: 16 A (AC), 10 A (DC)
Power Consumption: < 1 W
Dry Contacts: Yes
Power Measurement: No
Roller Shutter Mode: No
Device Temperature Protection: Yes
Overload Protection: No
Operating Temperature: -20 °C to 40 °C
Wi-Fi: 802.11 b/g/n/ax (2.4 GHz), 2412–2472 MHz
Wi-Fi Range: up to 30 m indoors / 50 m outdoors (construction dependent)
Zigbee: 802.15.4
Zigbee Repeater: Yes
Zigbee Range: up to 100 m indoors / 300 m outdoors (construction dependent)
Bluetooth: Version 4.2
Bluetooth Range: up to 10 m indoors / 30 m outdoors (construction dependent)
Dimensions: 37 × 42 × 16 mm
Installation Notes
• Designed for in-wall installation behind switches or sockets
• Dry contact output allows control of low-voltage and high-voltage circuits
• Suitable for gates, garage doors, boilers, contactors, and lighting circuits
• Zigbee operation requires a compatible Zigbee coordinator
• Matter operation requires a Matter-compatible controller
• Installation on mains voltage should be carried out by a qualified electrician
In the Box
• Shelly 1 Gen4
• User guide