FoxESS Smart Meter DTSU666 (three-phase, direct and 200A-CT variants)
Official manufacturer global (EN datasheet) verified Sept. 1, 2026
Identity
| category | smart_meters |
| ean | UNKNOWN |
| manufacturer | FoxESS |
| market_version | UNKNOWN |
| model | Smart Meter DTSU666 (three-phase, direct and 200A-CT variants) |
| mpn | DTSU666 |
| product_family | FoxESS Smart Meter (DDSU666 single-phase / DTSU666 three-phase) |
| product_status | active |
| region | global (EN datasheet) |
| release_year | UNKNOWN |
| sku | UNKNOWN |
Electrical
| ct_ratio | direct variant: N/A; CT variant: 200A CTs ('3 CT 200A(1m)') |
| electrical_ratings | {'rated_voltage_vac': '304 ~ 499 (line) / 176 ~ 288 (phase)', 'rated_current_a': '0 ~ 200', 'accuracy_class': 'Class 1', 'power_consumption_w': '<=1', 'frequency_accuracy_hz': '+/-0.01'} |
| export_limitation_support | UNKNOWN |
| max_current_a | 80 (direct variant); 200 via CT (DTSU666 1.5(6)A with 3x 200A CT variant) |
| measurement_type | direct (base variant) / CT-based (200A CT variant) |
| modbus_rtu | true (RS485, 9600 baud) |
| modbus_tcp | False |
| phase_type | three-phase (3P4W) |
| rs485 | True |
| sources | [{'url': 'https://www.fox-ess.com/download/upfiles/EN-Smart-Meter-Datasheet-V1.1-20241128.pdf', 'title': 'FoxESS Smart Meter Datasheet (single-phase/three-phase)', 'doc_type': 'datasheet', 'publisher': 'FoxESS', 'revision': 'V1.1 2024/11/28', 'doc_date': '2024-11', 'language': 'en', 'accessed': '2026-09-01', 'confidence': 'officially-verified'}] |
| supported_inverter_brands_models | FoxESS inverters (sold as FoxESS Smart Meter; pairing per-series not enumerated in the fetched datasheet) |
Physical / mechanical
| cable_gland_sizes | N/A |
| depth_mm | 85 |
| din_rail_type | DIN35 rail |
| enclosure_material | UNKNOWN |
| height_mm | 100 |
| housing_color | UNKNOWN |
| mounting_hole_spacing_mm | N/A (DIN rail) |
| mounting_type | ['DIN-rail'] |
| screw_sizes | UNKNOWN |
| shipping_weight_kg | UNKNOWN |
| torque_specs | UNKNOWN |
| weight_kg |
1.5
FoxESS Smart Meter Datasheet (single-phase / three-phase) V1.1 — DTSU666 column 'Weight 1.5 kg'
|
| width_mm |
72
FoxESS Smart Meter Datasheet (single-phase / three-phase) V1.1 — DTSU666 column 'Dimensions 72*100*85 mm'
|
Installation
| ct_note | CT variant supplied as '3 CT 200A(1m)' - three 200 A current transformers with 1 m leads |
| indoor_outdoor | indoor (distribution enclosure); no IP rating stated in the datasheet |
| max_installation_altitude_m | UNKNOWN |
| mounting_orientation | DIN35 rail mounting inside a distribution board |
| surface_requirements | 35 mm DIN rail |
Environment
| cooling_method | natural convection |
| ip_rating | UNKNOWN |
| max_altitude_m | UNKNOWN |
| noise_level_db | N/A |
| operating_temperature_c | -25 ~ +55 |
| relative_humidity | 5 ~ 95 % (Non-condensing) |
| storage_temperature_c | -40 ~ +70 |
Interfaces & connectors
| modbus_rtu | yes (RS485, 9600 bps) |
| modbus_tcp | False |
| protocol_notes | Datasheet communication row: 'RS485' at 9600 bps |
| rs485 | yes |
Controls & display
| buttons | UNKNOWN |
| display_type | LCD display |
| leds | UNKNOWN |
| local_display | True |
| touchscreen | False |
Documents
Recorded conflicts
max_current_a Review required
80 (direct variant); 200 via CT — value currently stored on the record
0 ~ 200 A — FoxESS Smart Meter datasheet V1.1, DTSU666 column 'Rated/Max Current 0 ~ 200 A' (targeted re-extraction 2026-09-02)
the datasheet's single current row appears to cover the CT-fed variant; the 80 A direct figure may come from a different row/revision or from the DDSU666 column. Not resolved.
max_current_a Review required
80 (direct variant); 200 via CT — value currently stored on the record
0 ~ 200 A — FoxESS Smart Meter datasheet V1.1, DTSU666 column 'Rated/Max Current 0 ~ 200 A' (targeted re-extraction 2026-09-02)
the datasheet's single current row appears to cover the CT-fed variant; the 80 A direct figure may come from a different row/revision or from the DDSU666 column. Not resolved.
Additional documented parameters
Recorded verbatim from the source; no schema field exists for these yet.
| CT variant | 3 CT 200A(1m) |
| Power consumption | <=1 W |