Shelly Pro 3EM Switch Add-on – Compact DIN-Rail Energy Monitor with Wireless Control
The Shelly Pro 3EM Switch Add-on is a DIN-rail mounted energy metering device designed to measure and monitor electrical consumption in real time. It connects to the Shelly 3 EM main unit via a dedicated add-on interface, extending its measurement capabilities with additional current sensing up to 2 A per phase.
DIN-rail installation for standard 35 mm industrial enclosures — no extra mounting hardware needed
2 A rated current per phase, suitable for branch circuit monitoring in residential and light commercial setups
Wireless control and automation via Bluetooth, Wi-Fi, and Modbus RTU — integrate into existing smart home or building management systems
Real-time energy metrics including active power, reactive power, power factor, and energy import/export direction
What sets the Shelly Pro 3EM Switch Add-on apart
Unlike standalone energy monitors, this add-on module extends an existing Shelly 3 EM hub rather than requiring a separate gateway. The DIN-rail form factor and 2 A current rating make it ideal for retrofitting into distribution boards where space is limited. Its multi-protocol wireless stack (Bluetooth, Wi-Fi, Modbus) ensures compatibility with a wide range of automation platforms without additional hardware.
Ideal for...
Electricians and facility managers who need to add per-phase energy monitoring to an existing Shelly 3 EM installation. Suitable for small commercial buildings, workshops, and residential setups with DIN-rail distribution boards where individual branch circuits require metering.
Application of Shelly Pro 3EM Switch Add-on
Mount the add-on on a DIN rail inside the distribution board adjacent to the Shelly 3 EM main unit
Connect the current sensing leads to the target branch circuit
Pair the module via Bluetooth or Wi-Fi using the Shelly Cloud or local API
Configure measurement rules and automation triggers through the Shelly web interface or Modbus commands
Shelly is a Swiss-based IoT company specialising in smart home and building automation hardware. Their product portfolio spans wireless relays, dimmers, energy meters, and H&T sensors, all designed for DIN-rail installation and local or cloud-based control. Shelly devices are widely adopted in European residential and light commercial installations for their open protocol support and straightforward setup.
It is a DIN-rail mounted energy metering add-on that extends the Shelly 3 EM main unit with per-phase current sensing up to 2 A, enabling real-time monitoring of energy consumption and generation at the branch circuit level.
The Shelly Pro 3EM Switch Add-on supports Bluetooth, Wi-Fi (WLAN), and Modbus RTU for wireless control, automation integration, and data retrieval via the Shelly Cloud or local API.
It measures active power (Wirkleistung), reactive power (Blindleistung), power factor (Leistungsfaktor), and voltage (Spannung), along with energy import and export direction.
It mounts directly on a standard 35 mm DIN rail inside the distribution board. No additional mounting hardware is required — it is designed for compact installation alongside the Shelly 3 EM main unit.
Shelly provides a 60-month manufacturer warranty on the Pro 3EM Switch Add-on, covering defects in materials and workmanship under normal operating conditions.
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