Device Comparison
Carlo Gavazzi EM340 vs EM530 vs Eastron SDM630 vs Chint DTSU666
A classic DIN-rail meter comparison for buyers choosing between established Modbus-ready three-phase metering options.
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Which To Choose
Start with the practical fit, then read the table.
Carlo Gavazzi EM340
Best fit when two-phase 3-wire plus three-phase 3-wire and 3-phase 4-wire systems., solar import/export visibility, and local dashboards and Home Assistant.
Carlo Gavazzi EM530
Best fit when two-phase 3-wire, three-phase 3-wire, three-phase 4-wire, and 4-wire delta / wild-leg systems up to 415 V L-L., solar import/export visibility, and local dashboards and Home Assistant.
Eastron SDM630
Best fit when single-phase two-wire, three-phase three-wire, and three-phase four-wire (1P2W / 3P3W / 3P4W)., solar import/export visibility, and local dashboards and Home Assistant.
Chint DTSU666
Best fit when three-phase four-wire (3P4W), solar import/export visibility, and local dashboards and Home Assistant.
Use this comparison when the shortlist is made up of traditional DIN-rail meters and the decision comes down to wiring fit, installer familiarity, and monitoring platform support.
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.
Carlo Gavazzi EM340
- Phase
- Two-phase 3-wire plus three-phase 3-wire and 3-phase 4-wire systems.
- Installation
- Indoor 3-DIN DIN-rail mounted direct-connected three-phase energy analyzer.
- Measurement
- Direct-connected energy analyzer for consumption, generation, imported/exported energy, and electrical parameter measurement over RS485 Modbus RTU.
- Max current
- 65 A
Carlo Gavazzi EM530
- Phase
- Two-phase 3-wire, three-phase 3-wire, three-phase 4-wire, and 4-wire delta / wild-leg systems up to 415 V L-L.
- Installation
- Indoor 3-DIN DIN-rail mounted energy analyzer for electrical-panel or switchboard installation with external current sensors.
- Measurement
- CT-operated two/three-phase energy analyzer for consumption, generation/import-export energy, electrical variables, and Modbus RTU integration.
- Max current
- 10000 A
Eastron SDM630
- Phase
- Single-phase two-wire, three-phase three-wire, and three-phase four-wire (1P2W / 3P3W / 3P4W).
- Installation
- Indoor 4-module 35 mm DIN-rail direct-connected installation by a qualified electrician; IP51 front protection; no external CT for the 100 A direct-fed variant.
- Measurement
- Direct-connected active/reactive power and bidirectional import/export energy metering.
- Max current
- 100 A
Chint DTSU666
- Phase
- Three-phase four-wire (3P4W)
- Installation
- Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure
- Measurement
- Bidirectional three-phase smart energy meter measuring import/export energy and electrical parameters over RS485 Modbus RTU
- Max current
- 80 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 | Two-phase 3-wire plus three-phase 3-wire and 3-phase 4-wire systems. | Two-phase 3-wire, three-phase 3-wire, three-phase 4-wire, and 4-wire delta / wild-leg systems up to 415 V L-L. | Single-phase two-wire, three-phase three-wire, and three-phase four-wire (1P2W / 3P3W / 3P4W). | Three-phase four-wire (3P4W) |
| Installation | Indoor 3-DIN DIN-rail mounted direct-connected three-phase energy analyzer. | Indoor 3-DIN DIN-rail mounted energy analyzer for electrical-panel or switchboard installation with external current sensors. | Indoor 4-module 35 mm DIN-rail direct-connected installation by a qualified electrician; IP51 front protection; no external CT for the 100 A direct-fed variant. | Indoor DIN-rail mounted direct-connected meter in an IP20 enclosure |
| Measurement | Direct-connected energy analyzer for consumption, generation, imported/exported energy, and electrical parameter measurement over RS485 Modbus RTU. | CT-operated two/three-phase energy analyzer for consumption, generation/import-export energy, electrical variables, and Modbus RTU integration. | Direct-connected active/reactive power and bidirectional import/export energy metering. | Bidirectional three-phase smart energy meter measuring import/export energy and electrical parameters over RS485 Modbus RTU |
| Max current | 65 A | 10000 A | 100 A | 80 A |
| Nominal voltage | Unknown | 120-240 V L-N / 208-415 V L-L | Unknown | Unknown |
| Meter fit | ||||
| Accuracy class | Active energy Class 1 / Class B; reactive energy Class 2. | Class 0.5S active; Class 2 reactive; X SKU non-MID. | Class 0.5 (active energy) | Class B / 1.0 (MID Certified) |
| Current sensing | Direct connection 5(65) A; no external CTs for EM340DINAV23XS1X. | External current transformers for EM530DINAV53XS1X AV5: 5 A CT secondary input, CT ratio up to 2000, primary current up to 10 kA. | Direct connection up to 100 A per phase; no external current transformers for the SDM630 Modbus 100 A direct-fed variant. | Direct connection 0.25-5(80)A; DTSU666-CT variants are separate CT-input models |
| Monitoring | ||||
| Protocol | RS485 / Modbus RTU | Modbus RTU | Modbus RTU | RS485 / Modbus RTU |
| Local API | Yes | Yes | Yes | Yes |
| Cloud dependency | No vendor cloud required for core metering; readings are available locally through RS485 Modbus RTU. | No vendor cloud required for core metering; data is available locally over RS485 Modbus RTU to a Modbus master, PLC, BMS, SCADA, or gateway. | No vendor cloud is required for the SDM630 Modbus variant; data is read locally over RS485 Modbus RTU. | No native vendor cloud dependency in the reviewed CHINT source set; integration is via local RS485 Modbus RTU to an inverter, BMS, SCADA, EMS, or gateway. |
| Home Assistant | Yes | Yes | Yes | Yes |
| Solar fit | ||||
| Solar import/export | Yes | Yes | Yes | Yes |
| Buying context | ||||
| Price range | Unknown | About $250-$500 | Unknown | Unknown |
| Availability | Carlo Gavazzi global and regional product channels; distributor stock and certification variants vary by market. | Global Carlo Gavazzi and regional distributor channels; exact EM530 variants and approvals vary by country. | UK / EU through Eastron Europe; broader Eastron global SDM630 family availability depends on local distributors and model certification. | Global CHINT product range with localized availability through CHINT subsidiaries and distributors |
| Source check | ||||
| Last verified | Jul 18, 2026 | Aug 30, 2026 | Aug 18, 2026 | Jul 12, 2026 |
| Product page | Official page | Official page | Official page | Official page |
| Documentation | Official docs | Official docs | Official docs | Official docs |
Verdict
Choose the meter that best matches the local wiring standard, platform support, and installer preference, because all four are credible choices for structured Modbus metering.
FAQ
Common decision questions.
Which energy meter should I choose?
Choose the option that matches your installation constraints and data path first. For 4 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?
Carlo Gavazzi EM340, Carlo Gavazzi EM530, Eastron SDM630, Chint DTSU666 list Home Assistant support in the catalog. Carlo Gavazzi EM340, Carlo Gavazzi EM530, Eastron SDM630, Chint DTSU666 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.