The Shelly 2PM Gen4 is the fourth-generation smart relay from Shelly, specifically designed to control two independent electrical circuits or one shutter motor. This compact and highly versatile device is an ideal solution for home automation, suitable for controlling lighting, sockets, fans, electric blinds, and shades. Its small size allows it to be installed into standard wall boxes or electrical enclosures, making it easy to integrate into existing systems without the need for major modifications.
One of the key innovations in the Shelly 2PM Gen4 compared to its predecessor is its support for multiple communication protocols – Wi-Fi, Bluetooth, Zigbee, and its compatibility with the Matter standard. This multi-protocol operation ensures broad compatibility with popular smart home platforms like Apple Home, Google Home, Amazon Alexa, and SmartThings. As an open system, it also integrates seamlessly with Home Assistant and MQTT environments. With Matter certification, the device is future-proof, supporting the emerging industry standard expected to dominate in the coming years.
A standout feature of this relay is its integrated, channel-specific energy monitoring, which enables real-time tracking and optimization of power usage. In shutter mode, the device supports precise position and slat-angle control of blinds and shutters – a premium-grade feature. The Shelly 2PM Gen4 offers not only user-friendly Plug & Play installation but also deep integration capabilities for advanced users, including scripting, MQTT, REST API, WebSocket, and Shelly's proprietary automation system. This makes it a perfect choice for both DIY projects and professional installations.
About the Shelly Brand
The Shelly brand, developed by Bulgaria-based Shelly Group (formerly Allterco Robotics), is one of the most recognized names in smart home technology. Its product line includes relays, sensors, dimmers, and energy meters widely used by both home and business users worldwide. The brand is known for its open system, hub-free operation, which allows easy Wi-Fi-based control and broad compatibility with platforms like Home Assistant, Google Home, Alexa, SmartThings, and Matter. Shelly products stand out for their advanced features, reliability, and developer-friendly environment.
Main Product Features
- Dual-channel relay control: Controls two independent electrical circuits, each supporting up to 10 A, with a combined maximum load of 16 A continuous.
- Energy monitoring: Built-in, independent power metering on both relays with real-time and logged consumption data.
- Shutter/blind mode: Supports bi-directional AC motors with position and slat-angle control for blinds.
- Multi-protocol support: Wi-Fi, Bluetooth, zigbee, and Matter in one device, enabling simultaneous operation.
- Built-in web interface: Local web UI for configuration and control, usable without internet access.
- Scripting and API support: Built-in scripting engine, MQTT, REST API, WebSocket, Webhook, TLS, and custom certificate support.
Smart Home Protocols and Platform Compatibility
- Protocols: Wi-Fi (2.4 GHz), Bluetooth 5.0, Zigbee 3.0.
- Local interfaces: Bluetooth module for connecting sensors and remote controllers, plus 2 physical switch inputs (S1, S2).
- Native platform: Shelly factory cloud, Shelly Smart Control mobile app and web interface.
- Matter support: Matter-compatible device, compatible with Apple Home, SmartThings, Home Assistant, and Google Home.
- Cloud integrations: Supports Google Assistant, Amazon Alexa, and Samsung SmartThings.
- Third-party integrations: IFTTT, Webhooks, MQTT, REST API, KNXnet/IP.
- Open-source compatibility: Full integration with Home Assistant, Node-RED, Domoticz, and MQTT.
- Voice control: Works with Alexa, Google Assistant, and Apple Siri.
Smart Features
- Remote and local control of relay states (ON/OFF, position) via smartphone or web browser.
- Real-time and historical energy monitoring, statistics, and reports.
- Data querying and export via REST API or MQTT.
- Timer-based operations and programmable events based on sunrise/sunset.
- Shutter motor control with interlock, position-based stop functions.
- Automation triggers via integration with other devices (e.g., motion sensor activates the relay).
- Local and cloud operation – core functions available over local network without internet.
- User permission sharing and multi-user access management.
- Script-based automation for advanced users (e.g., energy monitoring, conditional logic).
Electrical Specifications
- Power supply: 110–240 V AC or 24 V DC ±10%.
- Relay outputs: 2 relay channels, max 10 A/channel (AC), up to 30 V DC at 10 A.
- Total output: Maximum combined current 16 A continuous, peak 18 A.
- Energy metering: Independent current and voltage measurement on both relays.
- Switch inputs: 2 push-button or switch inputs (S1, S2).
- Shutter mode: Interlock, auto-stop, timed open/close, slat-angle control.
- Dry contact/NO/NC: Not supported.
Additional Specifications
- Dimensions: 42 × 37 × 16 mm – fits into standard wall boxes.
- Built-in temperature sensor: Overheat protection included.
- Usage: Indoor use only, IP20.
- Connectors: Supports wires with 0.2–2.5 mm² cross-section.
- Operating temperature: –20 °C to +40 °C; humidity: 30–70%.
- Wireless range: Wi-Fi/Bluetooth: 30–50 m; Zigbee: up to 300 m outdoors.
- Power consumption: Less than 1.4 W during operation.
