Chint DDSU666 (single-phase DIN-rail smart meter, direct to 80 A)
Description
Direct-feed measurement without external current transformers.
Chint DTSU666 is an 80 A direct-connect three-phase smart energy meter featuring European MID certification, Class 1.0 accuracy, and high-speed RS485 Modbus RTU telemetry, engineered for dynamic zero-export control and solar self-consumption optimization on residential hybrid inverters.
80 A Direct-Connect Measurement
Eliminates external current transformers (CTs) and secondary wiring, simplifying distribution box installation for standard 3-phase domestic services.
MID Certified (Class B / Class 1.0 Accuracy)
European Measuring Instruments Directive (MID) certified, ensuring utility-grade metering accuracy for sub-billing and solar compliance.
Universal Inverter Compatibility (Modbus RTU)
Pre-calibrated communication profile natively supported by SAJ, GoodWe, and major European inverter brands via RS485.
Comprehensive Multi-Parameter Backlit Display
Displays real-time voltage, current, active power, reactive power, power factor, and bidirectional kWh import/export.
More product details
Wiring external split-core current transformers in cramped residential breaker panels adds clutter and potential phase-rotation wiring errors. The DTSU666 feeds main phase conductors (up to 25 mm²) directly through internal measurement shunts.
- Direct measurement up to 80 A per phase covers standard domestic 3-phase grid services (up to 55 kVA).
- Eliminates CT orientation errors (K-L polarity mismatches) that cause battery control failures.
- Measures active energy, reactive energy, voltage, current, and frequency simultaneously.
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3 models
Accuracy class
Class B/ 1.0
Class C/ 0.5S
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Communication
Modbus-RTU
Modbus-RTU
RS485
Weight
0.33 kg (Approx.)
0.33 kg (Approx.)
200 g
Dimensions
72mm × 100mm × 65mm
72mm × 100mm × 65mm
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Sub-second zero-export closed-loop control with certified precision.
Executing tight feed-in limitation requires rapid communication between the meter and the hybrid inverter. The DTSU666 transmits bidirectional power data at up to 9600 baud. High-speed RS485 Modbus RTU interface broadcasts power metrics to inverters every few hundred milliseconds. MID approval (Class B active energy accuracy) certifies the meter for tenant sub-billing and solar subsidies. Standard 35 mm DIN-rail mount (72 mm / 4U width) fits standard domestic electrical panels.
Four modules of board space, 0.33 kg
72 x 100 x 65 mm on standard 35 mm rail. It is a sub-distribution device by size as well as by job, and the four modules are worth reserving while the board is still being drawn.
Under 2 W, permanently powered
2 W or less at 10 VA across 3x220/380 to 3x240/415 V, and it tolerates 0.8 to 1.15 Un. A device that runs every hour of the system's life costs effectively nothing to run.
Class B, counted in both directions
Class B active accuracy at 50 and 60 Hz, with import and export kept as separate registers. That separation is what makes self-consumption and feed-in readable as two numbers rather than one net figure.
Technical data
Zero-CT direct measurement engineered for residential three-phase hybrid solar and dynamic export regulation.
80 A direct-connect three-phase smart meter with MID certification and Class 1.0 accuracy.
Serving as the European benchmark for three-phase residential solar metering, the Chint DTSU666 measures direct currents up to 80 A without requiring external current transformers. Pre-configured with RS485 Modbus RTU communication, it provides high-speed power data for SAJ and GoodWe hybrid inverters to execute dynamic zero-export and self-consumption optimization.
- Direct Connect
- 80 A
- Legal Billing
- MID Class B
- Fast Telemetry
- < 1s
- Panel Integration
- DIN-Rail
Model & Type
- Brand
- Chint (Zhejiang Chint Instrument & Meter)
- Model
- DTSU666
- Type
- Three-phase DIN-rail smart energy meter
- Connection
- 3P4W, direct
- Accuracy
- Class B / 1.0 (active)
Electrical
- Nominal voltage (V)
- 3×220/380 ... 3×240/415
- Operating range
- 0.8 Un ~ 1.15 Un
- Current (A)
- 0.25 - 5(80), direct
- Frequency (Hz)
- 50 / 60
- Power consumption
- ≤ 2 W, 10 VA
Communication & Display
- Display
- Backlit LCD
- Interface
- RS485, Modbus-RTU
- Baud rate (bps)
- 1200 / 2400 / 4800 / 9600 (default) / 19200
- LED indication
- Pulse output
- Measured values
- Import/export kWh and kvarhkW, kvar, kVA · Irms, Vrms, frequency, power factor
Environment & Mechanics
- Operating temperature (°C)
- -25 ~ +55
- Storage temperature (°C)
- -40 ~ +70
- Relative humidity
- ≤ 95% RH, non-condensing
- Ingress protection
- IP20
- Mounting
- DIN rail, 35 mm
- Dimensions (W×H×D, mm)
- 72 × 100 × 65
- Weight (kg)
- 0.33
Logistics
- Packaging (VPE)
- 1 per carton
Project fit
Where this model fits.
Scenarios that show which projects the Chint DTSU666 belongs in, what to verify before quoting, and when another model is the better pick.
Project scenario
Standard Three-Phase Residential Solar Installations (up to 80 A Service)
Single-family homes with standard three-phase 400 V grid service (up to 80 A main breaker) installing an SAJ or GoodWe hybrid inverter.
Direct-connect architecture avoids CT wiring, providing clean, reliable grid telemetry.
- BoundaryIf the electrical service exceeds 80 A (e.g. 100 A, 160 A, 250 A) or the main electrical busbars cannot be disconnected for direct pass-through, step up to the Chint DTSU666-CT. ---
What Linker confirms with you
- If the electrical service exceeds 80 A (e.g. 100 A, 160 A, 250 A) or the main electrical busbars cannot be disconnected for direct pass-through, step up to the Chint DTSU666-CT. ---
Documents
Chint DTSU666 catalog (EN) Chint DTSU666 / DSSU666 user manual (EN)Product questions
What is the maximum wire gauge accepted by the DTSU666 direct terminals?
Up to 25 mm² stranded copper conductors. The meter's heavy-duty brass tunnel terminals accept up to 25 mm² stranded copper cable (or 35 mm² solid), accommodating standard residential main service cables up to 80 A.
System components
Required components
MBS KBU 58 split-core CT, pick the ratio matching site current
Item number: DLK-MBS-KBU58-400-5A
DTSU666-CT needs 3 external CTs with a 5 A secondary (not included with the meter): KBU 58 supplies that interface across six ratios. Not needed for the direct-connect DTSU666.
