Shelly
Shelly Pro EM-50. 2-Channel DIN Rail Energy Meter with Contactor Control, WiFi, LAN & Modbus
Shelly Pro EM-50. 2-Channel DIN Rail Energy Meter with Contactor Control, WiFi, LAN & Modbus
SKU:Pro EM-50
Condition: New
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Shelly Pro EM-50 is a professional DIN-rail mounted 2-channel single-phase energy meter designed for accurate monitoring and smart control of electrical loads.
With integrated dry contact output for contactor control, it allows you not only to measure energy consumption with 1% accuracy (Class B), but also to automate circuits, HVAC systems, water heaters, EV chargers, and other high-load equipment.
Featuring WiFi, LAN (Ethernet), Bluetooth, MQTT, Modbus TCP, and scripting capabilities, it integrates seamlessly into residential, commercial, and industrial installations.
Includes two 50A current transformers (CTs).
Perfect for:
• Smart panels
• Energy audits
• Solar & PV monitoring
• Load control automation
• Commercial facilities
Why choose the Shelly Pro EM-50?
Because it combines precise energy monitoring, smart automation, and professional-grade connectivity in a single DIN-rail device — ideal for residential, commercial, and industrial smart panels.
KEY FEATURES
• 2 Independent Measurement Channels
• 1% Accuracy (Class B – IEC 62053-21)
• Integrated 2A Dry Contact for Contactor Control
• LAN (Ethernet) + WiFi + Bluetooth
• Modbus TCP & MQTT Support
• 60 Days Local Data Storage
• Photovoltaic Ready
• Includes 2x 50A CT Clamps
Functionalities
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Wi-Fi, LAN and Bluetooth connectivity
Simultaneous Ethernet and Wi-Fi usage. MQTT, inbound and outbound WebSocket, UDP, mTLS support.
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MODBUS support
Allows for easy and fast deployment in existing industrial installations.
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Integrated switch
2 A dry contacts switch for contactor control.
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Accuracy class B (active energy)
Shelly Pro EM-50 has a measurement accuracy of 1%.
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Power measurement
Monitors two independent channels on the same phase.
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Scripting
Shelly Pro EM-50 fully supports mjS scripting, allowing you to create further features and functionalities.
No hub required, Universally compatibleShelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed. Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system. |
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No hub required, Universally compatibleShelly Products can be controlled locally, directly and without a hub through your smartphone/table with Shelly App - no hub or other equipment needed. Enable cloud feature and get remote control from anywhere. At the same time, you can integrate Shelly directly with virtually every smart home hub, voice assistant, open source platform, or premium control system. |
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Wiring Diagram
| Physical | |
|---|---|
| Size (HxWxD): | 94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in |
| Weight: | 63 ±1 g / 2.22 ±0.05 oz |
| Mounting: | DIN rail |
| Screw terminals max torque: | 0.4 Nm / 4.43 lbin |
| Conductor cross section: | 0.5 to 2.5 mm² / 20 to 14 AWG (solid, stranded and bootlace lugs) |
| Conductor stripped length: | 6 to 7 mm / 0.24 to 0.28 in |
| Shell material: | Plastic |
| Color: | White |
| Environmental | |
| Ambient 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: | < 3 W |
| Output circuits ratings | |
| Max switching voltage AC: | 240 V |
| Max switching voltage DC: | N/A |
| Max switching current: | 2 A |
| Sensors, meters | |
| Internal-temperature sensor: | Yes |
| Voltmeter (RMS): | 100 - 260 V |
| Voltmeters accuracy: | ±1 % |
| Ammeters (RMS via CT): | 0 - 50 A |
| Ammeters accuracy: | ±1 % (5 - 50 A), ±2 % (0 - 5 A) |
| Power and energy meters: | Active and apparent power |
| Active and apparent energy | |
| Power factor | |
| No load threshold: | 30 VA per phase |
| Measurement data storage: | At least 60 days of 1 min data resolution |
| Data export: | CSV for PQ recorded values |
| JSON format export through RPC | |
| Radio | |
| RF band: | 2400 - 2495 MHz |
| Max. RF power: | <20 dBm |
| Wi-Fi protocol: | 802.11 b/g/n |
| Wi-Fi Range: | Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors |
| (Depends on local conditions) | |
| Bluetooth Protocol: | 4,2 |
| Bluetooth Range: | Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors |
| (Depends on local conditions) | |
| MCU | |
| CPU: | ESP32-D0WDQ6 |
| Flash: | 16 MB |
| Firmware capabilities | |
| Webhooks (URL actions): | 20 with 5 URLs per hook |
| Scripting: | Yes |
| MQTT: | Yes |
| CoAP: | No |
| Shelly Pro EM-50 | Shelly Pro 3EM |
|---|---|---|
AC voltage per Channel | 100-260 volts 50/60Hz | 100-260 volts 50/60Hz |
Phases Supported | Single (same phase only) | Single, Split Single, Two, Three |
Number of CTs | 2 | 3 |
Max Amps/Channel | 50 | 120 or 400 |
Contactor Control | Yes | Requires Pro 3EM Switch Add-on |
Contactor AC | 100-260 volts 50/60Hz | 100-260 volts 50/60Hz |
Contactor DC | N/A | Up to 30 Volts |
Contactor Amperage | 2 amps | 2 amps |