Shelly EM Gen3 50A Wi-Fi Smart Energy Meter with Dual-Channel Monitoring
The Shelly EM Gen3 is a compact Wi-Fi and Bluetooth-enabled smart energy meter designed to provide real-time monitoring and control of electrical energy consumption in your home or business. This Gen3 device uses up to 2 current transformers for contactless metering, allowing you to track the energy usage of individual appliances and circuits with precision. It includes a 50A CT clamp in the box and features a dry contact relay for controlling external contactors, making it ideal for managing heavy-load appliances like water heaters, heat pumps, and HVAC systems.
Why You'll Love the Shelly EM Gen3
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Real-Time Energy Monitoring: Track voltage, current, power, power factor, and total energy consumption as it happens to identify efficiency opportunities
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Dual-Channel Measurement: Monitor up to 2 circuits simultaneously with single-phase, two-channel metering (one 50A clamp included)
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No Hub Required: Connects directly to your 2.4 GHz Wi-Fi network with Bluetooth 4.2 for quick setup and gateway functionality
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Local & Cloud Data Storage: Stores up to 10 days of data locally in 1-minute intervals; cloud history extends to 365 days
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Contactor Control: Built-in dry contact relay (2A at 230V AC) for switching heavy-load devices via external contactors
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Compact DIN Rail Design: Small form factor (37 × 42 × 16 mm) installs easily in electrical panels, behind wall switches, or in tight spaces
Smart Home Integration Made Easy
The Shelly EM Gen3 works standalone in a local Wi-Fi network or integrates seamlessly with popular smart home automation platforms including Home Assistant, Amazon Alexa, Google Home, MQTT, and Shelly Smart Control. It supports advanced scripting, webhooks, and REST API for custom automations and local control without relying on the cloud. Access and control your energy meter remotely from anywhere with an internet connection via the free Shelly Smart Control app.
Powerful Gen3 Performance
Built on the latest Shelly Gen3 platform, this energy meter features a proprietary Shelly chip with 8MB of memory, dramatically improving device performance, reliability, and speed. The Gen3 series introduces virtual components, allowing you to integrate non-Shelly devices into a unified control system within the app. Monitor real-time power consumption, set custom scenes and schedules, and automate based on instantaneous power or cumulative energy usage.
Precise Measurement & Accuracy
The Shelly EM Gen3 measures active and apparent power, energy, power factor, and reactive energy with high accuracy. It operates on a voltage range of 110-240V AC (±2%) with a current measurement range of 0-80A. Measurement accuracy is ±2% for 2-50A, ±2% for 1-2A, and ±5% for 0-1A, ensuring reliable data for energy management and cost reduction.
Flexible Installation Options
The device can be mounted on a standard 35mm DIN rail, retrofitted into electrical wall boxes, or installed behind power sockets and light switches. It supports up to 2 current transformers (contactless metering) with no need for extra wiring. One 50A CT clamp is included; optional 80A clamps are available separately for higher-load monitoring.
What's in the Box
- Shelly EM Gen3 smart energy meter
- 50A current transformer (CT clamp)
- Quick start guide
Full Specifications
Measurement & Monitoring
| Measurement Type |
Single phase, dual-channel energy metering |
| Monitored Parameters |
Active power, apparent power, voltage, current, power factor, reactive energy, frequency |
| Voltage Measurement Range |
110-240V AC (±2%) |
| Current Measurement Range |
0-80A per channel |
| Current Transformer Support |
Up to 2 CT clamps (contactless metering) |
| Included CT Clamp |
50A (one included) |
| Measurement Accuracy |
±2% (2-50A), ±2% (1-2A), ±5% (0-1A) |
| Maximum Input Current |
16A per channel at 110-230V AC, 50/60 Hz |
Contactor Control
| Relay Type |
Dry contact |
| Maximum Load |
2A at 230V AC, 50/60 Hz |
| Compatible Load Types |
Resistive, capacitive, and inductive loads (via external contactors) |
Data & Storage
| Local Data Storage |
Up to 10 days (1-minute intervals) |
| Cloud Data History |
Up to 365 days |
| Memory |
8MB (Gen3 Shelly chip) |
| Real-Time Clock |
Yes |
Connectivity
| Wi-Fi |
2.4 GHz 802.11 b/g/n |
| Wi-Fi Range |
Up to 50m outdoors / 30m indoors (environment dependent) |
| Bluetooth |
Bluetooth 4.2 |
| Bluetooth Range |
Up to 30m outdoors / 10m indoors |
| Supported Protocols |
MQTT, WebSocket, HTTP, RPC, REST API, scripting, webhooks |
| Hub Required |
No |
Smart Features
| Voice Control |
Amazon Alexa, Google Home |
| Home Automation Integration |
Home Assistant (local), Shelly Smart Control, MQTT |
| Local Control |
Embedded web interface, scripting support |
| Virtual Components |
Yes (Gen3 feature) |
| Smart Schedules |
Yes |
Power & Environment
| Input Voltage Range |
100-260V AC, 50/60 Hz |
| Operating Temperature |
-20°C to +40°C |
| Operating Humidity |
30-70% RH |
| Indoor Use Only |
Yes |
Physical
| Dimensions (H × W × D) |
37 × 42 × 16 mm (1.46 × 1.65 × 0.63 inch) |
| Weight (EM Gen3) |
23g (0.81 oz) |
| Weight (CT 50A) |
50g (1.76 oz) |
| Mounting |
35mm DIN rail, in-wall, behind switch/socket |
| Conductor Cross Section |
0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded, bootlace ferrules) |
| Maximum Screw Terminal Torque |
0.4 Nm / 3.5 lbin |
Warranty & Compliance
| Warranty Period |
3 years (Shelly Gen3 devices) |
| Model Number |
S3EM-002CXCEU |
| Device SSID |
ShellyEMG3-XXXXXXXXXXXX |
Specifications are sourced from the manufacturer product page and may be updated.
