Shelly
Shelly 3EM Pro V2
Shelly 3EM Pro V2
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Shelly Pro 3EM V2 – Professional Three-Phase Energy Meter
Monitor energy consumption and production with precision using the Shelly Pro 3EM V2. This DIN rail-mounted energy meter delivers real-time measurements across three-phase or single-phase electrical systems, making it ideal for residential, commercial, agricultural, and multi-dwelling installations.
The Shelly Pro 3EM V2 reports accumulated energy together with instantaneous voltage, current, active power, apparent power, and power factor for each phase. Measurements are stored locally in non-volatile memory for at least 45 days at one-minute intervals, allowing historical data to be retrieved even when an internet connection is unavailable.
With Ethernet, Wi-Fi, Bluetooth, an embedded web interface, and support for MQTT, HTTP, WebSocket, scripting, and webhooks, the device integrates easily into professional energy-management and automation systems. All inbound connections support TLS.
Matter-ready: Learn how to enable Matter.
Key Features
- Three-phase and single-phase monitoring for flexible installation
- Four-quadrant measurement for imported and exported energy
- Photovoltaic-ready for monitoring solar generation and consumption
- DIN rail mounting for professional electrical-panel installation
- Non-contact current measurement using compatible current transformers
- Real-time monitoring of voltage, current, active power, apparent power, energy, and power factor
- At least 45 days of local data storage at one-minute resolution
- Built-in real-time clock to maintain accurate timestamps during internet interruptions
- Phase-sequence error detection when enabled
- Channel-to-channel calibration with a minimum load of 500 W per channel
- Configurable no-load threshold with a default threshold of 30 VA per channel
- Accuracy Class B for active-energy measurement
- Optical pulse indication of measured energy flow
- CSV and JSON data export
- Local and cloud operation
- Internal temperature monitoring
- Optional external contactor control through the Shelly Pro 3EM Switch Add-on
Reliable Local Data Storage
Measurement data is recorded directly on the device for at least 45 days, using one-minute intervals. Its built-in real-time clock helps preserve accurate timestamps if access to an SNTP server or the internet is interrupted.
Recorded power-quality values can be exported in CSV format, while device data can also be retrieved in JSON format through RPC.
Flexible Connectivity and Integration
- Ethernet through an RJ45 connection
- 2.4 GHz Wi-Fi
- Bluetooth 4.2
- MQTT support
- HTTP and WebSocket communication
- TLS support for inbound connections
- Embedded web interface
- Custom scripting
- Up to 20 webhooks with five URLs per hook
- Shelly Cloud compatibility
Each connectivity option can be enabled or disabled according to the requirements of the installation. The device can operate independently on a local network or communicate with compatible cloud and building-automation services.
Ideal Applications
- Residential energy monitoring
- Apartments, condominiums, hotels, and other multi-dwelling properties
- Small offices, shops, restaurants, and service stations
- Farms, barns, silos, and other agricultural facilities
- Government and municipal buildings
- Universities, colleges, and educational facilities
- Solar photovoltaic installations
Supported Load Types
- Resistive: incandescent lighting and heating equipment
- Capacitive: LED drivers, capacitor banks, electronic equipment, and motor-start capacitors
- Inductive: transformers, fans, refrigerators, and air-conditioning equipment
Technical Specifications
| Physical | |
|---|---|
| Dimensions | 94 × 19 × 69 mm / 3.70 × 0.75 × 2.71 in |
| Weight | 62 g / 2.19 oz |
| Mounting | DIN rail |
| Terminal conductor size | 0.5–2.5 mm² / 20–14 AWG |
| Maximum terminal torque | 0.4 Nm / 4.43 lb-in |
| Stripped conductor length | 6–7 mm / 0.24–0.28 in |
| Electrical | |
| AC supply voltage | 100–260 V AC, 50/60 Hz |
| Power consumption | Less than 3 W |
| Voltage measurement | 100–260 V RMS per phase |
| Voltage accuracy | ±1% |
| Current measurement | 0–120 A RMS per phase and neutral using current transformers |
| Compatible current transformer | Shelly CT 120A |
| Current accuracy | ±1% at 2–120 A; ±2% at 1–2 A; ±5% at 0–1 A |
| No-load threshold | 30 VA per channel |
| Calibration minimum load | 500 W per channel |
| Connectivity | |
| Ethernet | RJ45 |
| Wi-Fi | 802.11 b/g/n, 2.4 GHz |
| Wi-Fi range | Up to 30 m indoors or 50 m outdoors, depending on conditions |
| Bluetooth | Bluetooth 4.2 |
| Bluetooth range | Up to 10 m indoors or 30 m outdoors, depending on conditions |
| Environmental and Hardware | |
| Operating temperature | −20°C to 40°C / −5°F to 105°F |
| Relative humidity | 30–70% RH |
| Maximum altitude | 2,000 m / 6,562 ft |
| Processor | ESP32-D0WDQ6 |
| Flash memory | 16 MB |
| Local data storage | At least 45 days at one-minute resolution |
Electrical Interfaces
- Four line inputs: three phase inputs and one neutral input
- Four current-transformer inputs: three phase inputs and one neutral input
- One RJ45 Ethernet port
- Shelly proprietary serial interface for a compatible add-on
Accuracy and Measurement Notes
- The stated active-energy measurement accuracy is 1%, based on internal design validation and testing.
- A load of at least 500 W per channel is required for channel-to-channel calibration.
- If the load falls below 30 VA per channel, the measured power may still be displayed, but consumed energy will not be added to the energy statistics.
- Phase-sequence detection evaluates voltage zero crossings and reports an error if an incorrect phase order is detected while the feature is enabled.
