Shelly Pro EM-50 (The Device) is a DIN rail mountable two-channel, single-phase energy meter. Enhanced with all the gen2 firmware flexibility and LAN connectivity, it provides professional integrators with additional options for end-customer solutions. It can work standalone in a local LAN and/or Wi-Fi network, or it can also be operated through cloud home automation services through MQTT, HTTP, and WebSocket. All inbound connections support TLS.
The Device reports accumulated energy as well as instantaneous voltage, current, active, and apparent power per phase in real time. It stores data in non-volatile memory that can be retrieved for a period of up to 60 days in 1-minute intervals.
The Device has a real-time clock to keep the correct time if the connection to an SNTP server is lost.
Shelly Pro EM-50 can be accessed, set up, and monitored remotely by the User, as well as the Device can access and communicate with an automation system, as long as they are in the same network infrastructure.
The Device has an embedded Web Interface which can be used to monitor and control the device, as well as adjust its settings.
The Device has a built-in relay for contactor control.
Features
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4 Quadrant measurement
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DIN rail mounting
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Current transformer connection
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External contactor control via built in dry-contact relay
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Optical pulse indication of energy usage
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Real-time clock
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Data logs
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Accuracy Class B (IEC 62053-21)
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Photovoltaic ready
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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Industrial (factories, power plants, water processing, refineries, etc.)
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Agricultural (farms, barns, silos, etc.)
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Government/municipal
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University/college
| Type | Value |
|---|---|
| Physical | |
| 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 |
| 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: | 100 – 260 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 powerActive and apparent energyPower factor |
| Measurement data storage: | At least 60 days of 1 min data resolution |
| Data export: | CSV for PQ recorded valuesJSON 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 |
| More info: | https://kb.shelly.cloud/knowledge-base/shelly-pro-em-50 |
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