Shelly Pro EM – 50A

£79.99 Excl. VAT £66.66

In stock

DIN-mountable Single-Phase Energy Meter with Contactor Control

The Shelly Pro EM-50 is a DIN rail mountable two-channel, single-phase energy meter. It has an integrated relay with dry contacts for contactor control.

  • LAN, Wi-Fi and Bluetooth connection for high security and reliability
  • Reports accumulated energy, as well as instantaneous voltage, current, active and apparent power per phase in real-time
  • Power metering - two independent measurement channels on the same phase
  • 4 Quadrant measurement with optical pulse indication of energy usage
  • Can be used with contactors for bigger loads
  • Accuracy Class B (IEC 62053-21)
  • Photovoltaic ready
  • Stores data in non-volatile memory that can be retrieved for a period of up to 60 days in 1-minute intervals.
  • No hub required! Easy control through the Shelly Smart Control app, most platforms and protocols, as well as voice assistants. Use it with Alexa, Home Assistant, or your preferred automation system.
  • Supports scripting, web hooks, MQTT, WebSocket, HTTPS, UDP, TLS, custom certificates & Modbus TCP protocol
*Package includes 2 pieces of 50 A Current Transformers

  • Wi-Fi, LAN and Bluetooth Connectivity

    Simultaneous ethernet and Wi-Fi usage. MQTT, inbound and outbound WebSocket, UDP, mTLS support.

  • Accuracy class B (active energy)

    Shelly Pro EM - 50 has a measurement accuracy of 1%.

  • MODBUS Support

    Allows for easy and fast deployment in existing industrial installations.

  • Power Monitoring

    Monitors two independent channels on the same phase. Fast notifications and at least 60 days of consumption data in 1-minute intervals.

  • Integrated Relay

    Integrated 2A dry contacts relay for contactor/load control.

  • Scripting Functionality

    Shelly Pro EM - 50A supports MJS scripting, allowing you to create additional features and functionality.



  • Power supply voltage AC 110-240V, 50/60Hz
  • Power consumption < 3W
  • Max switching voltage AC 240V
  • Max switching current 2A
  • Power metering 2 channels, up to 50A each


  • Mounting DIN rail
  • Voltmeter (RMS) 100-260V
  • Voltmeters accuracy ±1%
  • Ammeters (RMS via CT) 0-50A
  • Ammeters accuracy • ±1% (5-50A)
    • ±2% (0-5A)
  • Power and energy meters • Active and apparent power
    • Active and apparent energy
    • Power factor
  • No load threshold 30VA per phase
  • Measurement data storage At least 60 days of 1 minute data resolution
  • Data export • CSV for PQ recorded values
    • JSON format export through RPC
  • Webhooks (URL actions) 20 with 5 URLs per hook
  • Scripting Yes
  • MQTT Yes
  • CoAP No
  • Internal-temperature sensor Yes
  • Ambient temperature -20°C to +40°C / -5°F to +105°F
  • Humidity 30% to 70% RH


  • Wi-Fi protocol 802.11 b/g/n (2.4 GHz)
  • Wifi range (depending on local construction) • up to 50m outdoors
    • up to 30m indoors
  • RF band 2400-2495 MHz
  • Max. RF power <20 dBm
  • Bluetooth protocol 4.2
  • Bluetooth range (depending on local construction) • up to 30m outdoors
    • up to 10m indoors


  • (H x W x L) • 94x19x69 ±0.5 mm
    • 3.70x0.75x2.71 ±0.02 in

How it works?

Download the Shelly Cloud application on your smartphone or tablet
Connect to your Wi-Fi router
Place the device wherever you wish


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