Shelly
Shelly EM Gen3 — Wi-Fi Gen3 Energy Meter with 50A CT Clamp
Shelly EM Gen3 — Wi-Fi Gen3 Energy Meter with 50A CT Clamp
4.75 / 5.0
(4) 4 total reviews
Couldn't load pickup availability
Description
Description
Shelly EM Gen3 — WiFi Energy Meter
The Shelly EM Gen3 (model S3EM-002CXCEU) is a 3rd generation WiFi energy meter with two independent measuring channels. It includes a 50A current clamp and a dry contact output to control an external contactor. Compatible with DIN rail mounting.
- Model: S3EM-002CXCEU
- Connectivity: WiFi 802.11 b/g/n (2.4 GHz) + Bluetooth BLE 4.2
- Power Supply: 100-260V AC
- Measuring Channels: 2 independent (up to 120A total)
- Current Clamp Included: 50A
- Dry Contact Output: 2A/230V AC
- Operating Temperature: -40°C to +60°C
- Mounting: DIN Rail
- Protocols: MQTT, HTTP REST API, WebSockets, Webhooks, mJS Scripting
Use Cases
- Real-time electricity consumption monitoring for homes and commercial premises
- Contactor control for electricity tariff management or specific loads
- Integration with Home Assistant for local energy automation
- Permanent installation in electrical panel on DIN rail
Integrations: Home Assistant (local, no cloud), Amazon Alexa, Google Home, MQTT, HTTP REST API, mJS Scripting. No hub or subscriptions.
Connectivity
Connectivity
- RF Band: 2400 - 2495 MHz
- Max. RF Power: <20 dBm
- Wi-Fi Protocol: 802.11 b/g/n (2.4 GHz)
- Wi-Fi Range: Up to 30 m indoors / 50 m outdoors
- Bluetooth Protocol: BLE 4.2
- Bluetooth Range: Up to 10 m indoors / 30 m outdoors
Links of interest
Links of interest
Official Knowledge Base
Shelly EM Gen3 — Official Documentation
API and Technical Documentation
All Shelly Devices and Services
Certifications and Regulatory Compliance
Shelly EM Gen3 — Wi-Fi Gen3 Energy Meter with 2 Channels and 50A Clamp
The Shelly EM Gen3 (model S3EM-002CXCEU) is a new generation smart energy meter with Wi-Fi and Bluetooth BLE. It measures up to 2 circuits simultaneously, includes one 50A clamp, and features a dry contact output for contactor control. DIN rail mount. No proprietary hub or subscriptions required.
Technical Specifications — Shelly EM Gen3
- Model: S3EM-002CXCEU
- Connectivity: Wi-Fi 802.11 b/g/n (2.4 GHz) + Bluetooth BLE 4.2
- RF Band: 2400 – 2495 MHz
- Wi-Fi Range: Up to 30 m indoors / 50 m outdoors
- BLE Range: Up to 10 m indoors / 30 m outdoors
- Power Supply: 100–260 V AC, 50/60 Hz
- Measurement Channels: 2 (via current transformers)
- Included Clamp: 1 × 50A
- Dry Contact Output: Yes (for contactor control)
- Measured Parameters: Active and reactive power, voltage, current, power factor, accumulated energy
- Mounting: Standard DIN rail (35mm)
- Protocols: MQTT, HTTP REST API, WebSockets, Webhooks, mJS Scripting
- Certifications: CE, RoHS
Main Features
- 2 independent measurement channels to monitor 2 circuits simultaneously
- 50A clamp included — installation without power interruption
- Dry contact output for contactor and load control
- Compatible with solar panels: monitors production and consumption
- DIN rail mounting for integration into electrical panel
- mJS Scripting and MQTT for advanced automations without an external server
- OTA updates over Wi-Fi
- No proprietary hub or subscriptions — total local control
Compatible with
- Home Assistant (MQTT, local control)
- Amazon Alexa
- Google Home
- MQTT, HTTP REST API, WebSockets, mJS Scripting
Use Cases
- Monitoring total household electricity consumption
- Managing domestic photovoltaic solar energy
- Automatic control of contactors based on consumption
- Detection of anomalous consumption and energy saving
- Monitoring industrial or commercial circuits
Official Shelly distribution. Shipped from Spain. Official Shelly warranty.
Perfeito na medição de energia.
Todo está perfecto!
Muy bien
Ez dut oraindik probatu ta seguru ondo ibiliko dela.
No lo he probado aun pero seguro que funciona perfecto
Shelly EM Gen3 - Specifications

| PHYSICAL | |
|---|---|
| Size (HxWxD): | 37x42x16mm/1.46x1.65x0.63inch |
| Weight: | EM Gen3 - 23 g / 0.81 oz CT 50A - 50 g / 1.76 oz |
| Maximum screw terminal torque: | 0.4 Nm / 3.5 lbin |
| Conductor cross section: | 0.2 to 2.5 mm² / 24 to 14 AWG (solid, stranded and crimp terminals) |
| Stripped conductor length: | 6 to 7 mm / 0.24 to 0.28 in |
| Mounting: | Wall console, electrical cabinet |
| Housing material: | Plastic |
| Housing color: | White Charcoal gray |
| Connector color: | Black |
| ENVIRONMENTAL | |
| Ambient working temperature: | -20°C to 40°C / -5°F to 105°F |
| Humidity: | 30% to 70% RH |
| Maximum altitude: | 2000 m / 6562 ft |
| ELECTRIC | |
| Power supply: | 110 - 240 V~ 50/60 Hz |
| Energy consumption: | < 1.2 W |
| Neutral not required: | Yes or no |
| External protection: | 2 A, trigger characteristic B or C, interrupting capacity of 6 kA, energy limitation class 3 |
| EXIT CIRCUIT CLASSIFICATIONS | |
| Maximum switching voltage: | 240 V~ |
| Maximum switching current: | 2 A/240 V~ |
| SENSORS, METERS | |
| Voltmeter (AC): | 110-240 V~ 50/60 Hz |
| Voltmeter accuracy: | ±2% |
| Ammeter (AC): | 0 - 80A |
| Ammeter accuracy: | ±2% (2 - 50 A), ±2% (1 - 2 A), ±5% (0 - 1 A) |
| Compatible current transformers: | CT 50A (included in the package) CT 80A |
| Power and energy meters: | Active and apparent power Active and apparent energy Power factor Fundamental active energy and fundamental reactive energy |
| Minimum channel-to-channel calibration load: | 500 W |
| No-load threshold: | 30 VA per channel |
| Storage of measurement data: | At least 10 days of 1-minute data resolution |
| Data export: | CSV for PQ Registered Values Export in JSON format via RPC |
| Internal temperature sensor: | Yeah |
| RADIO | |
| Wi-Fi | |
| Protocol: | 802.11 b/g/n |
| RF Band: | 2412 - 2472 MHz |
| Maximum RF power: | < 20 dBm |
| Range: | Up to 30 m indoors and 50 m outdoors (Depends on local conditions) |
| Bluetooth | |
| Protocol: | 4.2 |
| RF Band: | 2402 - 2480 MHz |
| Maximum RF power: | < 4 dBm |
| Range: | Up to 10 m indoors and 30 m outdoors (Depends on local conditions) |
| MICROCONTROLLER UNIT | |
| CPU: | ESP-Shelly-C38F |
| Flash: | 8 MB |
| FIRMWARE CAPABILITIES | |
| Programming: | Yeah |
| Webhooks (URL actions): | 20 with 5 URLs per webhook |
| Scripting: | Yeah |
| MQTT: | Yeah |
| Encryption: | Yes (transport level) |
| Authentication: | Yes (application and transport level) |