Device Comparison
Shelly Pro 3EM-3CT63 vs Pro 3EM-400 vs Pro 3EM 120A
A Pro-line Shelly comparison for choosing the right three-phase model by current range, CT format, and panel fit.
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Which To Choose
Start with the practical fit, then read the table.
Shelly Pro 3EM-3CT63
Best fit when single-phase or three-phase installations., solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM-400
Best fit when three-phase or single-phase installations; supports multiple connection types and phase-sequence detection., solar import/export visibility, and local dashboards and Home Assistant.
Shelly Pro 3EM 120A
Best fit when single-phase or three-phase AC measurement., solar import/export visibility, and local dashboards and Home Assistant.
Use this comparison when you already want a Shelly Pro three-phase meter and the remaining question is which current transformer format matches the site.
At A Glance
Key fit signals before the full table
A quick pass over the most decision-shaping details for each device in this featured comparison.
Shelly Pro 3EM-3CT63
- Phase
- Single-phase or three-phase installations.
- Installation
- DIN-rail mounted panel energy meter with a combined 63 A three-phase current transformer.
- Measurement
- CT-based single- or three-phase energy meter with 4-quadrant / photovoltaic-ready active-energy measurement.
- Max current
- 63 A
Shelly Pro 3EM-400
- Phase
- Three-phase or single-phase installations; supports multiple connection types and phase-sequence detection.
- Installation
- DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation.
- Measurement
- CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy.
- Max current
- 400 A
Shelly Pro 3EM 120A
- Phase
- Single-phase or three-phase AC measurement.
- Installation
- DIN-rail mounted meter with external 120 A current transformers.
- Measurement
- CT-based single-/three-phase energy meter with 4-quadrant import/export measurement.
- Max current
- 120 A
Before You Decide
Checks that matter before price.
- Confirm your supply type first: single-phase, split-phase, or three-phase.
- Decide whether DIN-rail wiring, CT clamps, or utility-meter access fits your switchboard.
- Choose between cloud convenience and local data access before comparing prices.
- For solar homes, make sure import, export, and load readings are measured at the right point.
| Install fit | |||
|---|---|---|---|
| Phase support | Single-phase or three-phase installations. | Three-phase or single-phase installations; supports multiple connection types and phase-sequence detection. | Single-phase or three-phase AC measurement. |
| Installation | DIN-rail mounted panel energy meter with a combined 63 A three-phase current transformer. | DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation. | DIN-rail mounted meter with external 120 A current transformers. |
| Measurement | CT-based single- or three-phase energy meter with 4-quadrant / photovoltaic-ready active-energy measurement. | CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy. | CT-based single-/three-phase energy meter with 4-quadrant import/export measurement. |
| Max current | 63 A | 400 A | 120 A |
| Meter fit | |||
| Accuracy class | Class B active energy; Shelly documents 1% measurement accuracy. | Class B active energy; 1 percent measurement accuracy. | Class B active energy / 1% measurement accuracy |
| Current sensing | Combined 63 A three-phase non-contact CT assembly supplied with the Pro 3EM-3CT63. | Includes 3 x 400 A current transformers for phase measurement; fourth CT input supports neutral-current measurement. | 3 x 120 A current transformers for single- or three-phase measurement. |
| Monitoring | |||
| Protocol | LAN / Wi-Fi / Bluetooth / Modbus / MQTT / HTTP / WebSocket | Ethernet / Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / RPC / Modbus | LAN / Wi-Fi / Bluetooth / MQTT / HTTP / WebSocket / TLS |
| Local API | Yes | Yes | Yes |
| Cloud dependency | Optional Shelly Cloud for remote access; local LAN/Wi-Fi use is supported with embedded web interface plus Modbus, MQTT, HTTP, and WebSocket paths. | Optional Shelly Cloud; local LAN/Wi-Fi operation is supported through web UI, MQTT, HTTP/RPC, WebSocket, and Modbus-style paths. | Optional Shelly Cloud; local LAN operation is available through embedded web interface, Modbus TCP, MQTT, HTTP/RPC, WebSocket, scripting, and webhooks. |
| Home Assistant | Yes | Yes | Yes |
| Solar fit | |||
| Solar import/export | Yes | Yes | Yes |
| Buying context | |||
| Price range | About USD 150.99 | About USD 329.99 | About USD 154.99 |
| Availability | United States via Shelly USA official store; broader Shelly regional availability varies by country and distributor. | United States via Shelly USA store; broader Shelly regional availability varies by local store, distributor, and electrical compliance. | United States / Europe / regional Shelly official stores and distributors; exact 120A bundle availability varies by market. |
| Source check | |||
| Last verified | Jun 16, 2026 | Jun 13, 2026 | Jun 18, 2026 |
| Product page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs |
Verdict
Choose based mainly on current range and CT format: 3CT63 for integrated 63A installs, 120A for common mid-range clamp jobs, and 400A for larger-service monitoring.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 3 energy meter options, the full table is most useful after you know whether local data access, cloud convenience, backup behavior, solar visibility, or expansion matters most.
What should I check before comparing prices?
Check installation fit, required accessories, official documentation, monitoring platform support, and any unknown fields in the source-checked table. Price is only useful once those constraints are clear.
Can these devices work with local dashboards or Home Assistant?
Shelly Pro 3EM-3CT63, Shelly Pro 3EM-400, Shelly Pro 3EM 120A list Home Assistant support in the catalog. Shelly Pro 3EM-3CT63, Shelly Pro 3EM-400, Shelly Pro 3EM 120A are marked with local API support. Confirm firmware, region, and integration maturity before treating this as a final compatibility guarantee.
Are unknown fields a reason to avoid a device?
Not always. Unknown means the field was not confirmed from the reviewed source data. Treat it as a question for the installer, reseller, or manufacturer before making a purchase decision.
Does the verdict replace the specification table?
No. The verdict is a practical shortcut. Use the table to confirm the exact constraints that matter for your home, especially installation, monitoring, and support details.