Shelly Pro EM-50 - for DIN rail mountable two-channel, single-phase energy meter

Shelly Pro EM-50 - DIN rail mounted dual-channel single-phase energy meter

Device identification

• Device name: Shelly Pro EM-50

• Device model: SPEM-002CEBEU50

• Device SSID: ShellyProEM50-XXXXXX

Short description
The Shelly Pro EM-50 is a DIN rail mounted dual-channel single-phase energy meter. With Gen2 firmware and LAN connectivity, it gives professional integrators additional options for building end-customer solutions. The device can work standalone on a local LAN and/or Wi-Fi network, or be controlled via cloud-based home automation systems using the MQTT, HTTP and WebSocket protocols. All incoming connections support TLS.

The device shows accumulated energy consumption as well as real-time voltage, current, active and apparent power per phase. Data is stored in non-volatile memory and can be retrieved for up to 60 days at 1-minute resolution.

The device has a real-time clock that keeps accurate time even if the connection to the SNTP server is lost.

The Shelly Pro EM-50 can be accessed, configured and monitored remotely. It can also communicate with automation systems located on the same network infrastructure.

The device has a built-in web interface for monitoring and controlling the device and configuring its settings.

In addition, the device has a built-in relay for contactor control.

Key features

• 4-quadrant metering

• DIN rail mounting

• Current transformer (CT) connection

• External contactor control via built-in dry contact relay

• Optical pulse indicator showing energy consumption

• Real-time clock

• Data logging

• Accuracy class B (IEC 62053-21)

• Suitable for solar energy installations

Main applications

• Residential homes

• Apartment buildings (MDU – multi-dwelling units, hotels, etc.)

• Small businesses (offices, small shops, restaurants, petrol stations)

• Agriculture (farms, barns, silos)

• Government and municipal buildings

• Universities and colleges

Electrical interfaces

Inputs

• 2 power supply inputs on screw terminals: 1 L and 1 N

• 2 current transformer inputs: for measuring IA and IB current

Outputs

• 2 galvanically isolated relay terminals: I and O

Ethernet port

• 1 RJ45 connector
  ⚠ Warning! Only connect or disconnect the LAN cable when the device is powered off!

Add-on interface

• Shelly proprietary interface (serial protocol)
  ⚠ Warning! The add-on interface carries high voltage when the device is powered on!

Connectivity

• Wi-Fi

• Ethernet

• Bluetooth

All connectivity options can be enabled or disabled by the user.

Safety features

• Overheating protection

Supported loads

• Resistive (incandescent bulbs, heaters)

• Capacitive (LED drivers, capacitor banks, electronic devices, motor start capacitors)

• Inductive (transformers, fans, refrigerators, air conditioners)

Specifications (summary)

• Dimensions: 94×19×69 mm

• Weight: 63 g

• Mounting: DIN rail

• Wire cross-section: 0.5–2.5 mm²

• Supply voltage: 100–260 V AC, 50/60 Hz

• Power consumption: < 3 W

• Max. switching voltage: 240 V AC

• Max. switching current: 2 A

• Measurement accuracy: ±1 % (5–50 A), ±2 % (0–5 A)

• Data storage: up to 60 days at 1-min intervals

• Data export: CSV, JSON

• Wi-Fi range: up to 30 m indoors, up to 50 m outdoors

• Bluetooth 4.2, range up to 10 m indoors / 30 m outdoors

• CPU: ESP32-D0WDQ6, Flash 16 MB

• Supports: Webhooks, scripting, MQTT

User manual: Shelly Pro EM-50 multilingual printed user and safety guide.pdf Manufacturer's website: Shelly Pro EM-50