Shelly EM Gen 3

The Shelly EM Gen3 is a compact, next-generation smart energy meter designed for precise monitoring of your electricity consumption. Using up to two current transformers (CTs) for contactless metering, it measures the energy usage of appliances or entire circuits and reports the data to your smartphone, tablet, PC, or home automation system.

With its built-in dry contact relay, you can also control external loads, such as a contactor, directly from the device. Whether you prefer a standalone local Wi-Fi setup or integration with cloud-based automation services, the Shelly EM Gen3 offers full flexibility. Data is stored locally on the device for up to 10 days of minute-by-minute records, ensuring no information is lost.

Thanks to its small form factor, it can be retrofitted into standard wall boxes, electrical cabinets, or tight spaces behind sockets and switches. The embedded web interface allows you to configure, monitor, and control the device from any browser.

Key Features

• Compact & versatile – Fits in small electrical spaces for easy retrofitting.

• Two-channel measurement – Monitor up to two single-phase circuits simultaneously.

• Current transformer support – Works with included CT 50A or optional CT 80A.

• Dry contact relay – Control external loads or contactors.

• Real-time clock & local storage – Retains up to 10 days of minute-level data.

• Multiple protocols – MQTT, HTTP, WebSocket, RPC for integration flexibility.

• Local or cloud control – Works fully offline or via Shelly Cloud.

• Embedded web UI – Configure and control directly without extra software.

Use Cases

• Power Consumption Monitoring – Track real-time usage and historical trends.

• Energy Efficiency Optimization – Identify high-usage devices to save energy.

• Appliance Health Monitoring – Detect unusual consumption spikes indicating potential faults.

• Cost Management – Estimate and manage electricity costs effectively.

• Remote Monitoring – Check energy use from anywhere with internet access.

• Local Automation – Trigger rules based on power thresholds without internet dependency.

Technical Specifications

• Power Supply: 110–240 V AC, 50/60 Hz

• Power Consumption: < 1.2 W

• Measurement Range: 0–80 A (AC) per channel

• Accuracy: ±2% (2–50 A), ±5% (< 1 A)

• Connectivity: Wi-Fi (802.11 b/g/n), Bluetooth 4.2

• Integration: MQTT, HTTP, WebSocket, RPC

• Operating Temperature: –20 °C to 40 °C

• Mounting: Wall console or electrical cabinet

• Dimensions: 37 × 42 × 16 mm

• Weight: 23 g (device), 50 g (CT 50A)

Package Includes:

• Shelly EM Gen3 unit

• CT 50A current transformer

• User manual