Shelly EM Gen4
£67.39
Shelly EM Gen4 is a dual-channel smart energy meter for single-phase installations, giving real-time and historical monitoring of two separate circuits or appliances via clip-on current transformers. It includes a built-in dry contact relay for automating high-power loads like EV chargers or heat pumps, over Wi-Fi 6, Bluetooth, Zigbee or Matter.
- Two independent metering channels, up to 120A each
- Stores at least 30 days of 1-minute data locally
- Built-in dry contact relay for contactor control
- Multiprotocol connectivity: Wi-Fi 6, Bluetooth, Zigbee and Matter
Buy the Shelly EM Gen4 online in the UK from ShellyUK — genuine Shelly stock with fast UK delivery.
The Shelly EM Gen4 is a next-generation smart energy meter that gives you precise, real-time insight into your electricity consumption, while enabling intelligent control of high-power appliances. Designed for single-phase installations, it supports up to two current transformers for contactless energy monitoring across two independent channels, making it ideal for tracking individual circuits or appliances. With built-in WiFi 6, Bluetooth, Zigbee, and Matter support, it integrates seamlessly into virtually any smart home or automation platform without compromising on performance or flexibility.
Powered by Shelly's latest hardware with 16 MB of flash memory, the EM Gen4 stores at least 30 days of detailed 1-minute energy data directly on the device, ensuring you always have access to historical consumption records even without cloud connectivity. It also features a built-in dry contact relay for controlling external contactors, allowing you to automate high-power loads such as water heaters, heat pumps, EV chargers, or other heavy electrical equipment based on schedules, energy usage, or custom automation rules.
- Single-phase, dual-channel energy monitoring
- Includes one 50A current transformer (supports 50A, 80A & 120A CTs)
- Multi-protocol connectivity: WiFi 6, Bluetooth, Zigbee, and Matter
- 16 MB flash memory with at least 30 days of local 1-minute data logging
- Built-in dry contact relay for contactor control
- Real-time power monitoring and historical energy analysis
- Compact design for installation behind sockets, in enclosures, or consumer units
- Built-in protection against overheating, overvoltage, overcurrent, and overload
Whether you're monitoring your home's overall consumption, tracking individual circuits, identifying inefficient appliances, or controlling heavy electrical loads automatically, the Shelly EM Gen4 provides the detailed energy insights and smart control needed to reduce costs and optimise efficiency. Its combination of local data storage, advanced automation, and broad smart home compatibility makes it one of the most capable compact energy meters available.
Two independent metering channels, up to 120A each
Stores at least 30 days of 1-minute data locally
Built-in dry contact relay for contactor control
Multiprotocol connectivity: Wi-Fi 6, Bluetooth, Zigbee and Matter
Where you'd use it
Two-circuit energy comparison
Fit CTs to two separate circuits u2014 for example solar generation and whole-house consumption u2014 and compare them side by side to see how much of your own generation you're actually using.
Automated heavy-load switching
Use the built-in dry contact relay to switch an EV charger, heat pump or water heater on only when conditions suit, such as during a cheap tariff window or surplus solar generation.
Offline historical data logging
Rely on the 30 days of 1-minute data stored locally on the 16MB flash to review consumption patterns even if your internet connection or cloud account is unavailable.
Specification
Connectivity
- WiFi Protocol
- 802.11 b/g/n/ax (2.4 GHz)
- WiFi Frequency
- 2412 - 2484 MHz
- WiFi range (depending on local construction) • up to
- 50 m outdoors • up to 30 m indoors
- Bluetooth Protocol
- 5 (LE)
- Bluetooth Range (depending on local construction) • up to
- 30m/100ft outdoors • up to 10m/33ft indoors
- Zigbee Protocol
- 802.15.4
- Zigbee Repeater
- Yes
- Zigbee RF Bands
- 2405 - 2480 MHz
- Zigbee Range (depending on local construction) • up to
- 300m/984ft outdoors • up to 100m/328ft indoors
Protection & Safety
- External protection
- 2A, tripping characteristic B or C, 6kA interrupting rating, Energy limiting class 3
Physical & Build
- (H x W x L)
- 37 x 42 x 16 mm
Environmental
- Humidity
- 30% to 70% RH
Power & Electrical
- Power supply
- 110-230V ±10, 50/60Hz AC
- Power metering Two channels, up to
- 120A each (with additional clamps)
- Contactor control Maximum load: 2A at
- 230V 50/60Hz
- Electrical consumption < 1W
Other
- Consumption history At least
- 30 days of 1 min data resolution.
- Working temperature
- -20°C to 40°C / -5°F to 105°F
- Voltmeter (AC)
- 110-240 V~ 50/60 Hz
- Voltmeter accuracy
- ±2%
- Ammeter (AC)
- 0 - 120A
- Ammeter accuracy
- ±2% (2-50 A), ±2% (1-2 A), ±5% (0-1 A)
- Compatible current transformers • CT
- 50A (1 included in the package) • CT 80A • CT 120A
- Power and energy meters • Active and apparent power • Active and apparent energy • Power factor • Fundamental active and fundamental reactive energy
- Data export • CSV for PQ recorded values • JSON format export through RPC
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