Shelly 1 Gen4 Single Channel Dry Contact Smart Switch

The Shelly 1 Gen4 is a compact single-channel smart relay with potential-free dry contacts, designed for controlling lights, appliances, gates, garage doors, irrigation systems and other electrical loads. Supporting Wi-Fi, Zigbee, Bluetooth and Matter, it can integrate into a wide range of smart home and automation platforms while operating on both low-voltage DC and mains AC power.

Key Features:

• Single-channel smart relay
• Potential-free / dry contact output
• Up to 16A switching at 240V AC
• Up to 10A switching at 30V DC
• Supports 110-240V AC power supply
• Supports 12V DC and 24-48V DC power supply
• Wi-Fi 802.11b/g/n/ax connectivity
• Bluetooth 5 Low Energy
• Zigbee 3.0 support
• Matter certified
• Works with Apple Home through Matter
• Supports schedules, scenes and local actions
• MQTT and scripting support
• Embedded web interface
• Compact 37 x 42 x 16mm design

Features

True Dry Contact Switching

The Shelly 1 Gen4 uses potential-free relay contacts that are electrically isolated from the device’s own power supply. This allows it to switch low-voltage and mains circuits within its rated limits, making it suitable for applications such as garage doors, gates, contactors, heating controls and lighting systems.

Multiprotocol Smart Connectivity

Wi-Fi, Zigbee, Bluetooth and Matter support provide flexible integration with different smart home ecosystems. The device can work with platforms such as Apple Home, Alexa, Home Assistant and other compatible automation systems.

Low and High Voltage Power Support

The Shelly 1 Gen4 can be powered from 110-240V AC, 12V DC or 24-48V DC, allowing the same smart relay to be used across a wide range of residential, commercial and automation applications.

16A AC Switching Capacity

The relay can switch resistive loads up to 16A at 240V AC or up to 10A at 30V DC, providing sufficient capacity for many lighting, heating and appliance-control applications.

Local and Cloud Automation

The device can operate locally without an internet connection using its embedded web interface, schedules, scripting and MQTT. Cloud connectivity can also be enabled for remote control through the Shelly Smart Control app.

Compact Retrofit Design

Measuring only 37 x 42 x 16mm, the Shelly 1 Gen4 is designed to fit behind compatible wall switches, sockets and other compact electrical installations where space is limited.

Built-In Protection and Automation Features

An internal temperature sensor provides overheating protection, while support for schedules, webhooks, virtual components, KNXnet/IP communication and scripting enables advanced automation workflows.

• The dry-contact output is electrically isolated from the power supply circuit.
• Maximum switching ratings depend on load type; inductive and capacitive loads may require an RC snubber.
• Installation on mains-voltage circuits should be performed by a qualified electrician.

Technical Specifications:

Choose the Shelly 1 Gen4 Single Channel Dry Contact Smart Switch for flexible low- and high-voltage automation, 16A relay control, multiprotocol Wi-Fi, Zigbee, Bluetooth and Matter connectivity, and compact retrofit installation in modern smart home and automation systems.