Descripción
The Shelly EM Gen3 is a compact smart energy meter designed to monitor electricity consumption across up to two channels using current transformers (contactless measurement). It is ideal for homes, commercial premises, farms or technical applications where real-time consumption analysis is important.
The device enables precise monitoring of voltage, current, active and apparent power, energy and power factor, and data is stored locally for later reference. In addition, the Shelly EM Gen3 includes a dry contact relay for controlling external loads or a contactor.
Thanks to its compact dimensions, it can be installed in junction boxes, in electrical panels or near loads, making it an excellent solution for energy monitoring and automation projects.
Key features
-
2-channel smart energy meter
- Measurement via current transformers
-
Dry contact relay for controlling external loads
-
Wi-Fi + Bluetooth connectivity
- Real-time consumption monitoring
- Local data storage for up to 10 days
- Compatible with Android and iOS
- Integrated web interface
- Support for MQTT, HTTP, WebSocket and RPC
- Compact installation in a junction box or electrical panel
Features and benefits
? 2-channel consumption monitoring – You can track consumption for two different circuits or loads, ideal for comparative analysis and optimisation.
? Dry contact control – The integrated relay allows control of a contactor or other external loads, extending automation capabilities.
? Accurate data and local history - Shelly EM Gen3 records consumption data and provides access to local history, useful for diagnosis and analysis.
? Compact installation – Thanks to its small form factor, it can be fitted in tight spaces, in electrical boxes or in a control panel.
? Advanced smart integration – Integrates easily with smart home systems or external platforms via MQTT, HTTP, WebSocket and RPC.
? Suitable for energy efficiency – Helps identify high-consumption devices, estimate costs and optimise energy usage.
Applications
- Home energy monitoring
- Monitoring of 2 electrical circuits
- Consumption-based automation
- External contactor control
- Electrical panels and cabinets
- Smart home systems and commercial applications
| General information |
| Model |
Shelly EM Gen3 (S3EM-002CXCEU) |
| Product type |
2-channel smart energy meter |
| Installation |
In a junction box / electrical panel |
| Power supply |
| Supply voltage |
110–240 V AC, 50/60 Hz |
| Power consumption |
< 1.2 W |
| Energy measurement |
| Number of channels |
2 |
| AC voltmeter |
110–240 V AC, 50/60 Hz |
| Voltmeter accuracy |
±2% |
| AC ammeter |
0–80A |
| Ammeter accuracy |
±2% (2–50A), ±2% (1–2A), ±5% (0–1A) |
| Compatible transformers |
CT 50A (included), CT 80A |
| Available measurements |
Active and apparent power, active and apparent energy, power factor, fundamental active energy and fundamental reactive energy |
| No-load threshold |
30 VA / channel |
| Minimum channel-to-channel calibration |
500 W |
| Data storage |
| Local history |
up to 10 days |
| Storage resolution |
1 minute |
| Data export |
CSV / JSON via RPC |
| Integrated relay |
| Relay type |
Dry contact |
| Maximum switching voltage |
240V AC |
| Maximum current |
2A / 240V AC |
| Connectivity |
| Wi-Fi |
802.11 b/g/n |
| Bluetooth |
4.2 |
| Smart protocols and functions |
| MQTT |
Yes |
| HTTP |
Yes |
| WebSocket |
Yes |
| RPC |
Yes |
| Scripting |
Yes |
| Scheduling |
Yes |
| Webhooks |
Yes |
| Web interface |
Yes |
| Compatibility |
| Platforms |
Android, iOS |
| Sensors and protections |
| Internal temperature sensor |
Yes |
| Operating conditions |
| Operating temperature |
-20°C to +40°C |
| Humidity |
30%–70% RH |
| Dimensions |
| Dimensions |
37 x 42 x 16 mm |
| Device weight |
23 g |
| Weight of CT 50A |
50 g |
| Hardware |
| CPU |
ESP-Shelly-C38F |
| Flash memory |
8 MB |
