Device name: Shelly Pro EM-50
Device model: SPEM-002CEBEU50
Device SSID: ShellyProEM50-XXXXXX
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.
4 Quadrant measurement
DIN rail mounting
Current transformer connection
External contactor control via built in dry-contact relay
No load threshold*
Optical pulse indication of energy usage
Accuracy Class B (IEC 62053-21)
* In case the total load for a channel drops below 10 VA the measured power level will be displayed, but no consumed energy will be accumulated to the energy statistics and a
No load threshold notification will be displayed in the Device web interface and the mobile application.
MDU (Multi Dwelling Units - apartments, condominiums, hotels, etc.)
Light commercial (small office buildings, small retail/restaurant/gas station, etc.)
Industrial (factories, power plants, water processing, refineries, etc.)
Agricultural (farms, barns, silos, etc.)
Simplified internal schematics
Device electrical interfaces
2 line inputs on screw terminals: 1 L and 1 N
2 current transformer inputs: IA and IB for current measurement
2 galvanically isolated relay terminals: I and O
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.
Shelly proprietary serial interface
⚠CAUTION! High voltage on the add-on interface when the Device is powered!
Each connectivity option can be enabled or disabled by the user.
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)
One tactile dome button
Press and hold for 5 sec to activate Device AP.
Press and hold for 10 sec to factory reset.
Power: Red light if the power supply is connected.
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.
The LED will be 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 will be flashing when the Device is measuring energy according to settings with frequency dependent on the energy flowing through the measured circuit.
94x19x69 ±0.5 mm / 3.70x0.75x2.71 ±0.02 in
63 ±1 g / 2.22 ±0.05 oz
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
-20 °C to 40 °C / -5 °F to 105 °F
30 % to 70 % RH
2000 m / 6562 ft
Power supply voltage AC:
110 - 240 V, 50/60 Hz
Power supply voltage DC:
< 3 W
Output circuits ratings
Max switching voltage AC:
Max switching voltage DC:
Max switching current:
100 - 260 V
Ammeters (RMS via CT):
0 - 50 A
±1 % (5 - 50 A), ±2 % (0 - 5 A)
Power and energy meters:
No load threshold:
30 VA per phase
Measurement data storage:
At least 60 days of 1 min data resolution
2400 - 2495 MHz
Max. RF power:
Up to 30 m / 100 ft indoors and 50 m / 160 ft outdoors
Up to 10 m / 33 ft indoors and 30 m / 100 ft outdoors
Webhooks (URL actions):
20 with 5 URLs per hook
Basic wiring diagrams
Load circuit output terminal
Live (110-240 V) cable
Load circuit input terminal
First channel current transformer input
Second channel current transformer input
First channel current transformer
Live (110-240 V) terminal
Second channel current transformer
Components and APIs
Declaration of conformity