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; 100-260 V AC, 50/60 Hz., 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 with neutral; not for delta systems without neutral., 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; 100-260 V AC, 50/60 Hz.
- Installation
- DIN-rail panel installation with the included 3CT63 combined non-contact CT; professional electrical installation is recommended.
- Measurement
- CT-based single- or three-phase four-quadrant metering of import/export active energy, apparent energy, voltage, current, power and power factor.
- 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 with neutral; not for delta systems without neutral.
- Installation
- Indoor DIN-rail meter with external CTs in an electrical panel; qualified-electrician installation recommended.
- Measurement
- CT-based one- or three-phase meter with four-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; 100-260 V AC, 50/60 Hz. | Three-phase or single-phase installations; supports multiple connection types and phase-sequence detection. | Single-phase or three-phase with neutral; not for delta systems without neutral. |
| Installation | DIN-rail panel installation with the included 3CT63 combined non-contact CT; professional electrical installation is recommended. | DIN-rail mounted electrical-panel energy meter using external current transformers; intended for qualified installation. | Indoor DIN-rail meter with external CTs in an electrical panel; qualified-electrician installation recommended. |
| Measurement | CT-based single- or three-phase four-quadrant metering of import/export active energy, apparent energy, voltage, current, power and power factor. | CT-based three-phase / multi-circuit energy meter measuring voltage, current, active/apparent power, accumulated energy, and 4-quadrant import/export energy. | CT-based one- or three-phase meter with four-quadrant import/export measurement. |
| Max current | 63 A | 400 A | 120 A |
| Meter fit | |||
| Accuracy class | Class B active energy; +/-1% current accuracy from 2-63 A. | Class B active energy; 1% design-validated measurement accuracy. | Class B active energy / 1% measurement accuracy |
| Current sensing | Included combined 3CT63 non-contact three-phase CT assembly, rated 0-63 A with a 9 mm conductor aperture. | Three included CT-400A transformers cover phases A/B/C up to 400 A; a fourth CT input can measure neutral current, but the neutral CT is optional and not included. | Three 120 A CTs included; optional fourth 120 A neutral CT input. |
| 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 | Shelly Cloud is optional; local LAN/Wi-Fi, web UI, RPC, Modbus, MQTT, HTTP, WebSocket and Home Assistant operation do not require cloud. | Shelly Cloud optional; standalone LAN/Wi-Fi, local APIs, and Home Assistant work without cloud. | Shelly Cloud is optional; embedded web UI, RPC, MQTT, WebSocket, scripting and direct Home Assistant access work locally. |
| 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 and Europe via Shelly official stores; worldwide shipping is advertised, but electrical suitability and certification vary by destination. |
| Source check | |||
| Last verified | Aug 20, 2026 | Aug 18, 2026 | Aug 23, 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.