⚡ Shelly Pro 3EM 120A — 3-Phase DIN-Rail Energy Meter (3x 120A CTs)

A professional 3-phase energy meter for your distribution board. The Pro 3EM measures voltage, current, power factor and energy on all three phases (up to 120A per phase) with 1% accuracy, and connects over WiFi, LAN or Bluetooth — no hub required. Perfect for whole-home monitoring, solar/inverter installations and load management in South African homes and businesses.

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Free Delivery

Orders over R2,500

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Local Stock

Ships from Gauteng

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3-Phase

120A per phase

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DIN Rail

Pro series

⚡ Key Features

3-Phase Measurement — monitors voltage, current, active/apparent power, power factor and accumulated energy on each phase independently
3x 120A CT Clamps Included — clip-on current transformers, no need to break the circuit to install
1% Accuracy (Class B) — reliable enough for billing verification, tenant sub-metering and solar performance tracking
Bi-Directional Metering — measures energy consumed AND produced per phase; ideal for solar/grid-tie installations
WiFi + LAN + Bluetooth — wired Ethernet for rock-solid reliability in the DB board, or WiFi where cabling isn't practical
60 Days On-Device History — stores data in 1-minute intervals in non-volatile memory, even through load shedding
Modbus Support — integrates into existing building management and inverter setups
Single-Phase Flexible Mode — can also monitor 3 separate single-phase circuits (e.g. mains + geyser + stove)
No Hub Required — works with the Shelly app, Home Assistant, MQTT, HTTP and scripting out of the box

🇿🇦 Solar Tip: Clip one CT on your grid supply, and use the bi-directional readings to see exactly what you import vs export. In Home Assistant, the Pro 3EM feeds the Energy Dashboard directly — track Eskom usage vs solar yield per phase, and automate heavy loads (geyser, pool pump) to run when the sun is paying for them.

📋 Technical Specifications

Model	Shelly Pro 3EM — 120A
Phases	3 + Neutral monitoring
Current Range	0 – 120A per phase (via included CTs)
Voltage Range	100 – 260V RMS per phase
Accuracy (Active Energy)	1% (Class B)
Metering	Bi-directional (consumed + produced)
Connectivity	WiFi 2.4GHz · LAN (Ethernet) · Bluetooth
Protocols	MQTT, HTTP, Webhooks, Modbus, Shelly Scripting
Data Storage	60 days at 1-minute intervals (non-volatile)
Mounting	DIN rail (distribution board)
In the Box	1x Shelly Pro 3EM 120A, 3x 120A CT clamps

⚠️ DB Board Installation: This device is installed in your distribution board and wired to mains voltage. Installation must be done by a qualified electrician in accordance with SANS 10142.

❓ Frequently Asked Questions

Can I use this on a single-phase home?

Yes. The Pro 3EM can be configured to monitor three separate single-phase circuits — for example your mains supply, geyser and stove — each with its own CT clamp.

Does it work with Home Assistant?

Natively. The Shelly integration picks it up automatically and all per-phase sensors feed straight into the Home Assistant Energy Dashboard. MQTT is also supported for custom setups.

120A or 400A — which do I need?

For virtually all residential and small commercial DB boards (60A–100A supply), the 120A version is the right choice. The 400A version is for large commercial/industrial supplies.

Will it keep my data through load shedding?

Yes — readings are stored in non-volatile memory (up to 60 days at 1-minute resolution), so history survives power cuts and is synced when the device comes back online.