Shelly Pro 3EM 400A
Clamps on without rewiring · Electrician install
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Solar on the roof and no idea what is exported or imported?
CT clamps on each phase at the main switch let the Shelly Pro 3EM 400A show import and export live, per phase, with history. The clearest view of what the solar is actually doing. Diagram: Shelly.
3-phase supply and the customer wants whole-house consumption?
3 CT clamps on the incoming phases and the Shelly Pro 3EM 400A reports total and per-phase load, with voltage and power factor, straight to the app. No sub-meter needed. Diagram: Shelly.
Single-phase house, or 3 separate circuits to monitor?
On a single-phase board the 3 Shelly Pro 3EM 400A clamps can sit on 3 different circuits: mains, hot water, pool. Each gets its own kWh reading in the app. Diagram: Shelly.
Key features
400 A CT clamps included: 3 in the box, sized for larger 3-phase services.
Solar and battery ready: 4-quadrant measurement reads import and export per phase.
1% accuracy on active energy: precise enough for billing-grade monitoring.
60 days of local storage: history available even without a live cloud connection.
Works without the cloud: built-in web interface, local API and MQTT.
No built-in relay: metering only; add the Pro 3EM Switch Add-on for contactor control.
Optional neutral CT: for full 3-phase-plus-neutral measurement, sold separately.
Works with
Home Assistant
Shelly Smart Control app
MQTT
About this product
The Shelly Pro 3EM 400A is a DIN rail 3-phase meter built for whole-board monitoring on larger services. 3 × 400A clamps come in the box, plus a fourth optional neutral CT if you need it. Accuracy is rated at 1% on the active energy reading, with per-phase voltage, current, power factor and 4-quadrant measurement, which matters if there's solar or battery export on the same board.
It runs over Ethernet, Wi-Fi and Bluetooth at once, so it's not reliant on Wi-Fi alone once it's wired into the switchboard's network drop. 60 days of 1-minute data sits on the device itself, useful for pulling consumption history without needing the cloud connected.
Note that this unit has no built-in relay. If the job needs contactor control for load shedding or demand management, add a Shelly Pro 3EM Switch Add-on alongside it. It is a meter, not a switching device.
Model: SPEM-003CEBEU400
Switchboard install on a 3-phase service: licensed electrician required; add the Pro 3EM Switch Add-on if contactor or load control is part of the job.
Tech specs
Physical
| Model | SPEM-003CEBEU400 |
| Dimensions | 94 × 19 × 69 mm |
| Weight | 62 g |
Electrical
| Max load | 0 to 400 A per phase (CT clamps included); W not stated |
| Power monitoring | Yes: no built-in relay |
| Operating temperature | −20 to 40 °C |
Connectivity
| Wi-Fi | 802.11 b/g/n |
| Bluetooth | 4.2 |
Compatibility
| Compatibility notes | No built-in relay: for contactor/load-shedding control, a separate Shelly Pro 3EM Switch Add-on is required. |
In the box
| What's in the box | 3 × 400A current transformer clamps |
Warranty
| Manufacturer warranty | 5 Years |
| Free Ohmly extension | +1 Year Free Ohmly Warranty |
