Device Comparison
Carlo Gavazzi EM340 vs EM530 vs Eastron SDM630 vs Chint DTSU666
Free Compare
Build your own comparison
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.
| Install fit | ||||
|---|---|---|---|---|
| Phase support | Three phase | 3-phase and 2-phase electrical systems | 3PH-4W / 3PH-3W / 1PH-2W | 3P4W (three-phase, four-wire) |
| Installation | DIN-rail mounted direct-connected energy analyzer | DIN-rail CT-operated energy analyzer | DIN-rail mounted direct-fed energy meter | DIN-rail mounted direct-connected smart energy meter |
| Measurement | Direct-connected three-phase bidirectional energy analyzer | CT-operated energy analyzer with 5A secondary CT input and Modbus RTU | Direct-connected multi-function energy meter with bidirectional measurement | Direct-connected three-phase smart energy meter with bidirectional measurement |
| Max current | 65 A | 5 A | 100 A | 80 A |
| Nominal voltage | Unknown | 120-240 V L-N / 208-415 V L-L | Unknown | Unknown |
| Meter fit | ||||
| Accuracy class | Class 1 (kWh) according to EN62053-21 / Class B (kWh) according to EN50470-3 | Equivalent to Class 0.5 active energy (EN IEC 62053-21) | Class 0.5 (active energy) | Class 1 / MID Class B |
| Current sensing | Direct-connected current measurement up to 65 A; no external CTs | 5 A current transformers | Direct connected up to 100A | Direct-connected up to 80A; CT-input variants also exist |
| Monitoring | ||||
| Protocol | RS485 / Modbus RTU | Modbus RTU | Modbus RTU | RS485 / Modbus RTU |
| Local API | No | Yes | No | No |
| Cloud dependency | No native cloud dependency in the reviewed source set; integration is built around Modbus RTU and supervisory systems such as PLC, SCADA, and BMS. | Local-first Modbus RTU analyzer; no vendor cloud required. | No native cloud requirement in the reviewed source set; integration is built around Modbus RTU and installer-led monitoring stacks. | No native cloud dependency in the reviewed source set; integration is built around RS485 Modbus RTU with inverter, BMS, and energy-management systems. |
| Home Assistant | No | Yes | No | No |
| Solar fit | ||||
| Solar import/export | Yes | Yes | Yes | Yes |
| Buying context | ||||
| Price range | Unknown | About $250-$500 | Unknown | Unknown |
| Availability | Global / localized official product pages | EU, UK, AU, Global | UK / EU | Global |
| Source check | ||||
| Last verified | May 19, 2026 | May 19, 2026 | May 18, 2026 | May 18, 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.