Shelly EM Gen3

Shelly EM Gen3 – WiFi-Operated Dual-Channel Energy Meter with Contactor Control

Shelly EM Gen3 is a compact smart energy meter designed for accurate monitoring of electrical consumption in real time. With support for up to two current transformers (CT clamps), it provides precise power data for individual circuits and appliances. The device features a built-in dry contact relay for contactor control, local data storage, and seamless integration with Wi-Fi or cloud services.

Included in the package is 1 x 50A clamp, with support for additional clamps (up to 80A each).

Key Features

• Real-time energy monitoring with dual-channel support (up to 80A each, one 50A clamp included)

• Integrated dry contact relay for contactor control (2A max at 230V)

• On-device data storage for up to 10 days in 1-minute intervals

• Cloud logging for 365 days of consumption history

• Over-consumption and excess energy protection with automatic alerts or shutoff

• Wi-Fi connected, no hub required (can also operate as an access point)

• Bluetooth for quick setup and as a proxy for other BLE devices

• Embedded web server for local monitoring and control

• Full scripting support for advanced local automations

• Works with Shelly Cloud App, MQTT, REST API, and other home automation platforms

Applications

• Track and optimize electricity usage in your home or business

• Monitor individual appliances for performance and health

• Detect unusual power consumption patterns and prevent costly failures

• Manage electricity costs by identifying high-consumption devices

• Retrofit easily into wall boxes, sockets, or switch locations with limited space

Technical Specifications

Power

• Supply: 110–230V ±10%, 50/60Hz AC

• Consumption: < 1.2W

• Power metering: Two channels, up to 80A each

• Contactor control: Max load 2A at 230V, 50/60Hz

• External protection: 2A (B or C curve, 6kA interrupting rating, Energy limiting class 3)

Environment

• Operating temperature: -20°C to 40°C / -5°F to 105°F

• Humidity: 30% to 70% RH

Measurement

• Voltmeter range: 110–240V AC (±2%)

• Ammeter range: 0–80A (±2% at 2–50A, ±2% at 1–2A, ±5% at 0–1A)

• Compatible CTs: 50A (included), 80A (optional)

• Metrics: Active and apparent power/energy, power factor, fundamental active/reactive energy

• Data export: CSV for PQ values, JSON via RPC

Connectivity

• Wi-Fi protocol: 802.11 b/g/n (2.4 GHz)

• Frequency: 2412–2472 MHz

• Range: Up to 50m outdoors / 30m indoors (depending on construction)

• Bluetooth protocol: 4.2

• Bluetooth range: Up to 30m outdoors / 10m indoors

Dimensions

• Size (H x W x L): 37 x 42 x 16 mm

Notes

• Includes 1 x 50A clamp (additional 80A clamp available separately).