Shelly Pro EM-50

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 (active energy)1

• Photovoltaic ready

1 The Device has a measurement accuracy of 1%, based on internal design validation and testing.

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

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.

    • 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.

Legend

What are the differences between the different generations of Shelly products?

Each new generation adds more power, memory, and features:

Gen 1 offers basic control;

Gen 2 (Plus Series, Mini Series, Pro Series) adds Bluetooth, scripting, and better security;

Gen 3 improves performance, adds Matter (starting from firmware version 1.6.0 or newer) and advanced monitoring;

Gen 4 offers multi-protocol connectivity, featuring Wi-Fi 6, Bluetooth, Zigbee, and Matter.

Can I control the device via Bluetooth?

No, the protocol is used only for device inclusion, allowing for quick and easy setup through the Shelly Smart Control app.

For bluetooth control it is required to have another Bluetooth device such as Shelly BLU Button or Shelly BLU Motion to interact.

Additionally, Shelly devices can function as a BLE gateway, bridging Shelly BLU devices to your Wi-Fi network.

Is it possible to use the device without a hub?

Yes, Shelly devices (except for Wave devices) operate independently without the need for a hub. They connect directly to your Wi-Fi network, and you can control them via the Shelly Smart Control app, web interface, or through integrations with platforms like Google Home, Alexa, Home Assistant and Samsung SmartThings.