Huawei DTSU666-H 250A/50mA
Official manufacturer GLOBAL verified Sept. 3, 2026
Identity
| category | smart_meters |
| legal_entity_on_user_manual | HUAWEI DIGITAL POWER TECHNOLOGIES CO., LTD. |
| manufacturer | Huawei |
| marketing_name | Smart Power Sensor |
| model | DTSU666-H 250A/50mA |
| note | Distinct product from the 100 A DTSU666-H: different CT set, different CT ratio (5000:1 vs 2500:1) and a wider measurement range. Not merged. |
| region | GLOBAL |
| variant | 250 A / 50 mA (supplied with 250 A / 50 mA CTs) |
Electrical
| accuracy_class | Class 1 (user manual) |
| accuracy_current_voltage_pct | ± 0.5% |
| accuracy_power_energy_pct | ± 1% |
| ct_ratio | 250 A / 50 mA (5000:1) |
| ct_secondary_output_ma | 50 |
| ct_supplied | three 250 A / 50 mA CTs |
| frequency_hz | 50 / 60 |
| measurement_current_a | 0 - 250 A |
| measurement_line_voltage_v | 304 V AC - 499 V AC |
| measurement_method | external current transformers (not direct) |
| measurement_phase_voltage_v | 176 V AC - 288 V AC |
| nominal_voltage_v | 230 V AC / 400 V AC |
| phase_configuration | three-phase |
| power_consumption_w | ≤ 1 W |
| power_grid_type | 3P4W or 3P3W |
Physical / mechanical
| dimensions_h_w_d_mm | 72 x 100 x 65.5 mm |
| din_modules | 4 |
| mounting_type | DIN35 Rail |
| weight_basis | including cables (datasheet) |
| weight_kg | 1.5 |
Installation
| connected_device | Huawei inverter or SmartLogger via RS485 |
| import_export_measurement | Measured at the grid-connection point; CT orientation must follow the arrow direction shown in the wiring diagram. No explicit sign convention for import vs export is published in the fetched documents. |
| topology | DIN-rail mounted at the grid connection point. Three-phase four-wire: Ua, Ub, Uc, Un to terminals 3, 6, 9, 10. Three-phase three-wire: Ua, Uc, Ub to terminals 3, 9, 10. CT outputs IA*, IA, IB*, IB, IC*, IC to terminals 13, 14, 16, 17, 19, 21. |
Environment
| ip_rating | UNKNOWN |
| max_operating_altitude_m | UNKNOWN |
| operating_humidity_pct_rh | 5% RH - 95% RH (non-condensing) per datasheet; ≤75% RH per user manual |
| operating_temperature_c | -25 to +60 |
| storage_temperature_c | -40 to +70 |
Interfaces & connectors
| baud_rate_bps | 9600 (datasheet); 4800 / 9600 selectable per quick guide |
| communication_interface | RS485 |
| modbus_address_range | 11-19 |
| protocol | Modbus-RTU |
| register_map_public | UNKNOWN |
Certifications
| list | UNKNOWN |
Warranty & service
| standard_warranty_years | UNKNOWN |
Documents
datasheet
Smart Power Sensor Technical Specification (DDSU666-H / DTSU666-H / DTSU666-H 250A)
rev 06.2025
Recorded conflicts
environment.operating_humidity_pct_rh Review required
5% RH - 95% RH (non-condensing) — Huawei Smart Power Sensor datasheet 06.2025
≤75% RH — DTSU666-H User Manual Issue 06
physical.weight_kg Review required
1.5 kg — Huawei Smart Power Sensor datasheet 06.2025
≤ 0.8 kg — DTSU666-H User Manual Issue 06 (2024-05-06)
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| manufacturer_legal_entity_as_printed | CHINT |