Device identification
- Device name: Shelly Pro EM-50
- Device model: SPEM-002CEBEU50
- Device SSID: ShellyProEM50-XXXXXX
Short description
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
- 4 Quadrant measurement
- DIN rail mounting
- Current transformer connection
- External contactor control via built-in dry-contact relay
- Optical pulse indication of energy usage
- Real-time clock
- Data logs
- Accuracy Class B (IEC 62053-21)
- Photovoltaic ready
Main applications
- Residential
- MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
- Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
- Agricultural (farms, barns, silos, etc.)
- Government/municipal
- University/college
Simplified internal schematics
Device electrical interfaces
Inputs
- 2 line inputs on screw terminals: 1 L and 1 N
- 2 current transformer inputs: IA and IB for current measurement
Outputs
- 2 galvanically isolated relay terminals: I and O
Ethernet port
- 1 RJ45 connector
⚠ CAUTION! Plug in or unplug the LAN cable only when the Device is powered off! The LAN cable connector must not be metallic in the parts touched by the user to plug in or unplug the cable.
Add-on interface
- Shelly proprietary serial interface
⚠ CAUTION! High voltage on the add-on interface when the Device is powered!
Connectivity
- Ethernet
- Wi-Fi
- Bluetooth
Each connectivity option can be enabled or disabled by the user.
Safety features
- Overheating protection
Supported load types
- Resistive (incandescent bulbs, heating devices)
- Capacitive (LED light drivers, capacitor banks, electronic equipment, motor start capacitors)
- Inductive (transformers, fans, refrigerators, air-conditioners)
User interface
Inputs
- One tactile dome button
- Press briefly to toggle the state of the built-in relay.
- Press and hold for 5 sec to activate Device AP.
- Press and hold for 10 sec to factory reset.
Outputs
- LED indication
- Power: Red light if the power supply is connected.
- Wi-Fi (varies):
- Blue light if in AP mode.
- Red light if in STA mode, and not connected to a Wi-Fi network.
- Yellow light if in STA mode, and connected to a Wi-Fi network. Not connected to Shelly Cloud or Shelly Cloud disabled.
- Green light if in STA mode, and connected to a Wi-Fi network and the Shelly Cloud.
- Flashing Red/Blue if OTA update is in progress.
- LAN: Green light if LAN is connected.
- Out: Red light if the output relay contact is closed.
- Count: Red light flashing when the Device is measuring energy according to settings, frequency dependent on the energy flowing through the measured circuit.
Specifications
| Type | Value |
|---|---|
| Physical | |
| Size (HxWxD): | 94×19×69 ±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 power Active and apparent energy Power factor |
| 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 |
Basic wiring diagrams
| 
| 
|
Legend
| Terminals | Description | Wires | Description |
|---|---|---|---|
| O | Load circuit output terminal | L | Mono-phase live (110–240 V~) wire |
| I | Load circuit input terminal | LA | Split-phase live A (120 V~) wire |
| IA | First channel current transformer input | LB | Split-phase live B (-120 V~) wire |
| IB | Second channel current transformer input | N | Neutral wire |
| L | Live (110–240 V) terminal | Current transformers | |
| N | Neutral terminal | CTA | First channel current transformer |
| CTB | Second channel current transformer |
Shelly Smart Control
Troubleshooting
...
Components and APIs
Compliance
Shelly Pro EM-50 multilingual EU declaration of conformity 2025-07-25
Shelly PRO EM - 50 UK PSTI ACT Statement of compliance
Shelly Pro EM-50 AU NZ Certificate for Suitability
Compliance archive
Shelly Pro EM-50 multilingual EU declaration of conformity 22 2023-10-30