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Shelly Pro EM - 50

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Wi-Fi Energy Meter with Contactor Control

Shelly Pro EM-50 is a DIN rail mountable two-channel, single-phase energy meter. It has an integrated switch 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, webhooks, MQTT, WebSocket, HTTPS, UDP, TLS and custom certificates & Modbus TCP protocol


  • Standard warranty (included in purchase price): 5 Years warranty through manufacturer due to device malfunctions when it is used in user manual described conditions.


    Size (HxWxD): 94x19x69 ±0.5 mm / 3.70×0.75×2.71 ±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
    Ambient temperature: -20 °C to 40 °C / -5 °F to 105 °F
    Humidity: 30 % to 70 % RH
    Max. altitude: 2000 m / 6562 ft
    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
    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)
    CPU: ESP32-D0WDQ6
    Flash: 16 MB
    Firmware capabilities
    Webhooks (URL actions): 20 with 5 URLs per hook
    Scripting: Yes
    MQTT: Yes
    CoAP: No

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