Device identification
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Device name: Shelly EM Gen4
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Device model: S4EM-002CXCEU
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Device SSID: ShellyEMG4-XXXXXXXX
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BLE model ID: 0x1036
Short description
Shelly EM Gen4 (the Device) is a small form factor smart energy meter using up to 2 current transformers (contactless metering), which allows energy metering the consumption of electric appliances and reporting to a mobile phone, tablet, PC, or home automation system. It can work standalone in a local Wi-Fi network or it can also be operated through cloud home automation services. The Device has internal storage for data allowing for later retrieval. The Device has single dry contact switch for controlling external loads.
Shelly EM Gen4 can be accessed, controlled, and monitored remotely from any place where the User has internet connectivity, as long as the device is connected to a Wi-Fi access point and the Internet.
Shelly EM Gen4 can be retrofitted into standard electrical wall boxes, next to electrical appliances, power sockets, or in other places with limited installation space.
Shelly EM Gen4 has an embedded Web Interface which can be used to monitor, configure, and control the device.
The device has multi-protocol wireless MCU which provide Zigbee and Bluetooth connectivity ensuring a secure connection.
This device is compatible with Matter.
Main features
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Compact form factor
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Single phase, two channels measurement
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Current transformer connection
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Dry contact relay for contactor control
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Real-time clock
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Data logs stored on device for at least 30 days of 1 minute data records
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Upgraded with an improved processor and the addition of Zigbee connectivity
Use cases
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Power Consumption Monitoring: Monitor the power consumption of connected devices in real-time. This information can be valuable for understanding energy usage patterns and making informed decisions to reduce consumption.
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Energy Efficiency Optimization: Identify electrical energy consumption patterns and optimize electricity usage.
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Appliance Health Check: Keep track of the power usage of individual appliances to assess their health and performance over time. Sudden spikes or changes in power consumption may indicate issues with the appliance.
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Cost Management: With the knowledge of power consumption, you can estimate the cost of running specific devices and manage your electricity expenses more effectively.
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Space-Efficient Retrofitting: Integrate the device into standard electrical wall boxes, behind power sockets, light switches, or other locations with limited space.
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Remote Monitoring: Shelly EM Gen4 supports publishing data to Shelly cloud or other cloud based data collection and storage systems. This allows you to monitor power consumption even when you're away from home.
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Local Monitoring: Like the rest of the Shelly Wi-Fi line of devices Shelly EM Gen4 allows for local only monitoring and automations. Access stored energy consumption records directly from the device UI. Automate locally with rules based on instantaneous power consumption or energy consumer for a period of time.
Main applications
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Residential
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MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
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Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
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Government/municipal
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University/college
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Farming
Simplified internal schematics
Connectivity
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Wi-Fi
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Bluetooth
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Zigbee
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Matter
Protocols
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Zigbee
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MQTT
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HTTP
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HTTPS
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WebSocket
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RPC
Safety function
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Overheating protection
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Overvoltage protection
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Overcurrent protection
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Overpower protection
Supported load types
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Resistive (incandescent bulbs, heating appliances)
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Capacitive (capacitor banks, electronic equipment, motor starting capacitors)
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Inductive with RC Snubber (LED light drivers, transformers, fans, refrigerators, air-conditioners, washing machines, tumble dryers)
User interface
Inputs
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One (Control) button
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Press and hold for 5 seconds to enable Device access point and Bluetooth connection.
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Press and hold for 10 seconds to factory reset the Device.
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Outputs
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LED (monocolor) indication
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AP (Access Point) enabled and Wi-Fi disabled:
1 secondON/ 1 secondOFF -
Wi-Fi enabled, but not connected to a Wi-Fi network:
1 secondON/ 3 secondsOFF -
Connected to a Wi-Fi network:
ConstantlyON -
Cloud is enabled, but not connected:
1 secondON/5 secondsOFF -
Connected to Shelly Cloud:
ConstantlyON -
OTA (Over the Air Update):
½ secON/ ½ secondOFF -
Button pressed and held for 5 seconds:
½ secondON/ ½ secondOFF -
Button pressed and held for 10 seconds:
¼ secondON/ ¼ secondOFF
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The list above starts with the initial device status and the lowest priority. Every next state cancels the previous one.
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Specifications
| Quantity | Value |
|---|---|
| Physical | |
| Size (HxWxD): | 37x42x16 mm / 1.46x1.65x0.63 inch |
| Weight: | 26 g / 0.92 oz |
| Screw terminals max torque: | 0.4 Nm / 3.5 lbin |
| Conductor cross section: | 0.5 to 4 mm² / 20 to 11 AWG (solid, stranded, and bootlace ferrules) |
| Conductor stripped length: | 6 to 7 mm / 0.24 to 0.28 in |
| Mounting: | Wall console |
| Shell material: | Plastic |
| Shell color: | White |
| Connectors color: | Grey (Mouse Grey RAL7005, R(106) G(110) B(106), HEX #6A6E6A, LRV 15.19.) |
| Environmental | |
| Ambient working temperature: | -20 °C to 40 °C / -5 °F to 105 °F |
| Humidity: | 30 % to 70 % RH |
| Max. altitude: | 2000 m / 6562 ft |
| Electrical | |
| Power supply voltage AC: | 110 - 240 V, 50/60 Hz |
| Power supply voltage DC: | N/A |
| Power consumption: | < 1 W |
| External protection: | 2 A, tripping characteristic B or C, |
| Output circuits ratings | |
| Max switching voltage AC: | 240 V |
| Max switching voltage DC: | N/A |
| Max. switching current: | 2 A |
| Sensors, meters | |
| Voltmeter (AC): | 110 - 240 V |
| Voltmeter accuracy: | ±2 % |
| Ammeter (AC): | 0 - 120 A |
| Ammeter accuracy: | ±2 % (2 - 50 A), ±2 % (1 - 2 A), ±5 % (0 - 1 A) |
| Compatible current transformers: |
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| Power and energy meters: |
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| No load threshold: | 30 VA per phase |
| Measurement data storage: | At least 30 days of 1 min data resolution |
| Data export: | CSV for PQ recorded values JSON format export through RPC |
| Internal-temperature sensor: | Yes |
| Radio | |
| Wi-Fi | |
| Protocol: | 802.11 b/g/n/ax |
| RF band: | 2412 - 2484 МHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors |
| Bluetooth | |
| Protocol: | 5 (LE) |
| RF band: | 2402 - 2480 MHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| Zigbee | |
| Protocol: | 802.15.4 |
| Zigbee repeater: | Yes |
| RF bands: | 2405 to 2480 MHz |
| Max. RF power: | < 20 dBm |
| Range: | Up to 100 m / 328 ft indoors and 300 meters / 984 ft outdoors |
| Microcontroller unit | |
| CPU: | ESP32C6 |
| Flash: | 16MB |
| Firmware capabilities | |
| Schedules: | 20 |
| Webhooks (URL actions): | 20 with 5 URLs per hook |
| Scripting: | Yes |
| MQTT: | Yes |
Basic wiring diagrams
Legend
| Terminals | Wires | ||
|---|---|---|---|
| O | Load circuit output terminal | L | Live (110-240 V~) wire |
| I | Load circuit input terminal | N | Neutral wire |
| IA | First channel current transformer input | Current transformers | |
| IB | Second channel current transformer input | CTA | First channel current transformer |
| L | Live (110-240 V~) terminal | CTB | Second channel current transformer |
| N | Neutral terminal | | |
Shelly Smart Control
Components and APIs
Compliance
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Shelly EM Gen4 multilingual EU declaration of conformity 287 2026-04-23.pdf
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Shelly EM Gen4 UK PSTI ACT statement of compliance 287 2026-04-23.pdf
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Shelly EM Gen4 UKCA declaration of conformity 287 2026-04-23.pdf
