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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 total reviews

€58,96

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

  • 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

Official Knowledge Base

Shelly EM Gen3 — Official Documentation

API and Technical Documentation

This Device

All Shelly Devices and Services

Certifications and Regulatory Compliance

CE, RoHS — Shelly EM Gen3 Certifications

View full details

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.

Shelly EM Gen3 - Specifications

Shelly EM Gen3 - Diagram

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)