⚡ Shelly Pro 3EM 400A — 3-Phase DIN-Rail Energy Meter (3x 400A CTs)

The heavy-duty version of the Pro 3EM — a professional 3-phase energy meter that measures up to 400A per phase with 1% accuracy. Built for commercial and industrial installations: factories, office blocks, shopping centres, body corporates and large solar plants. WiFi, LAN and Bluetooth connectivity with no hub required.

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Free Delivery

Orders over R2,500

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Local Stock

Ships from Gauteng

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400A/Phase

Industrial grade

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DIN Rail

Pro series

⚡ Key Features

Up to 400A Per Phase — sized for commercial mains, industrial feeders and large solar/inverter installations
3x 400A CT Clamps Included — clip-on current transformers install without breaking the circuit
1% Accuracy (Class B) — dependable for tenant billing, cost allocation and energy audits
Bi-Directional Metering — tracks both consumed and produced energy per phase for grid-tied solar
WiFi + LAN + Bluetooth — wired Ethernet for reliable connectivity in plant rooms and DB boards
60 Days On-Device History — 1-minute interval data held in non-volatile memory through outages
Modbus Support — drops into building management systems and inverter monitoring
mTLS Security — secure MQTT, HTTP and WebSocket connections for commercial networks
No Hub Required — Shelly app, Home Assistant, MQTT and scripting out of the box

🇿🇦 Commercial Tip: Body corporates and landlords use the Pro 3EM 400A on the main incomer to verify municipal bills and detect abnormal overnight loads. Pair with 120A units on sub-boards for a full per-tenant energy picture — all visible in one Shelly or Home Assistant dashboard.

📋 Technical Specifications

Model	Shelly Pro 3EM — 400A
Phases	3 + Neutral monitoring
Current Range	0 – 400A 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 400A, 3x 400A 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

Do I need the 400A or the 120A version?

Check your main breaker: supplies up to 100A (typical homes and small business) are well served by the 120A version. Choose the 400A version for commercial/industrial incomers above 120A.

Does it work with Home Assistant?

Natively. Per-phase power, current, voltage and energy sensors feed straight into the Home Assistant Energy Dashboard. Modbus and MQTT are available for BMS integration.

Can it measure solar export?

Yes — metering is bi-directional on each phase, so grid import and export are tracked separately. Ideal for commercial grid-tie installations and SSEG reporting.