Chint rail-type electric meter DDSU666

The Chint rail-type electric meter **DDSU666** is a high-precision smart energy meter designed for single-phase circuits. It adopts **DIN35mm rail mounting** and is suitable for energy metering and monitoring in residential, commercial, industrial, and new energy scenarios. Below is its core information and application highlights:

I. Core Parameters and Functions*CHINT surge protector price*  

1. **Electrical Performance*CHINT circuit breaker price*  

   - **Current Specifications**: Covers multiple ranges from **0.25-0.5(60)A** to **0.4-1(100)A**, supporting direct connection or transformer connection.  

   - **Voltage Range**: **176-264VAC**, adapting to wide voltage fluctuations and compatible with Chinese and some international grid standards.  

   - **Accuracy Class**: Active power **Class 1**, reactive power **Class 2**, meeting industrial-level metering requirements.  

   - **Bidirectional Metering**: Supports independent metering of positive/negative active energy, records load curves, and is suitable for anti-backflow management in photovoltaic systems.  

2. **Design Features*Chint NXR series thermal overload relays price**  

   - **Smart Display**: LCD screen real-time displays over 10 electrical parameters including voltage, current, power, frequency, and power factor, with adjustable backlight.  

   - **Communication Function**: Standard **RS485 interface** supporting **ModBus-RTU protocol**, connectable to smart home systems (e.g., HomeAssistant) or energy management platforms for remote data monitoring and analysis.  

   - **Compact Size**: Dimensions of only **36×85×66mm** and weight of **0.21kg**, saving distribution box space and suitable for narrow installation scenarios.  

3. **Protection and Reliability*Chint NXBLE-40C6 residual current circuit breaker (RCCB)*  

   - **Protection Level**: IP51, dust-proof and drip-proof, ensuring stable operation in dusty environments.  

   - **Wide Temperature Operation**: Adapts to extreme temperatures of **-25℃~+55℃**, meeting outdoor or industrial environment requirements.  

   - **Anti-Interference Design**: Uses vacuum impregnation technology to reduce electromagnetic interference, suitable for co-network operation with precision equipment.  

II. Typical Application Scenarios**  

1. Residential and Rental Property Management**  

- **Scenario Value**:  

  - Landlords can monitor tenants' power consumption data in real time via RS485 communication to avoid billing disputes.  

  - Supports multi-tariff metering (requires software configuration), suitable for household energy-saving management in time-of-use pricing areas.  

- **Case**: In retrofits of old residential communities, DDSU666 can replace traditional mechanical meters, combined with smart gateways for remote data collection to reduce meter reading costs.  

2. Commercial and Industrial Monitoring**  

- **Applicable Equipment**:  

  - Mall lighting systems, catering kitchen equipment, small production lines, etc.  

- **Scenario Value**:  

  - Real-time monitoring of energy consumption in each circuit to optimize power usage strategies (e.g., off-peak operation) and reduce electricity costs.  

  - Rail mounting facilitates dense deployment in distribution cabinets, suitable for multi-circuit scenarios like data centers and hotels.  

3. New Energy and Photovoltaic Systems**  

- **Application Modes**:  

  - **Anti-Backflow Control**: Connected to inverters via RS485 to real-time monitor and limit reverse power flow from PV systems to the grid, avoiding policy violations.  

  - **Power Generation Statistics**: Independently meters PV panel power generation and load consumption to assist in system efficiency evaluation.  

- **Case**: In Chint's Yueqing Base 11.7MW rooftop PV project, DDSU666联动 with inverters to achieve precise power generation metering and energy flow management.  

4. Temporary Power and Construction Site Management**  

- **Scenario Characteristics**:  

  - Frequent start/stop of construction equipment and large voltage fluctuations, where traditional meters are prone to damage.  

- **Application Value**:  

  - Wide voltage adaptability ensures metering accuracy, and fan cooling design supports long-term high-load operation.  

  - RS485 communication can integrate with construction site monitoring platforms for real-time overload or abnormal power usage alerts.  

III. Documentation Required for Construction and Acceptance**  

Construction units must provide the following documents to the developer or supervisor:  

1. **Product Qualifications**  

   - Factory certificate, 3C certification (China market), CE certification (international market).  

   - Test reports (including accuracy tests, insulation strength, anti-interference performance, etc.).  

2. **Installation and Commissioning Records**  

   - Wiring diagrams (including transformer connection methods), ground resistance test reports (ground resistance ≤4Ω).  

   - Communication protocol configuration records (e.g., ModBus address, baud rate).  

3. **Personnel Qualifications**  

   - Electrician certificates for installers (special operation certificates required in China).  

   - For PV systems, PV system design plans and grid connection permit documents must be provided.  

IV. Installation and Usage Precautions**  

1. **Environmental Requirements**  

   - Installation location must be well-ventilated, avoiding direct sunlight or humid environments (humidity ≤75%).  

   - Derate usage when altitude exceeds 2000 meters (reduce capacity by 0.5% for every 100 meters increase).  

2. **Wiring Specifications**  

   - Direct connection meters: Conductor cross-sectional area ≥2.5mm² (below 60A) or 4mm² (80A and above).  

   - Transformer-connected meters: Require 5A transformers, secondary circuit conductor cross-sectional area ≥1.5mm², and length ≤5 meters.  

3. **Load Management**  

   - Avoid long-term operation exceeding rated current (e.g., 60A meter recommended maximum load 50A).  

   - Leave a 20% capacity margin for inductive loads (e.g., motors) during startup to prevent inrush current surges.  

4. **Communication Configuration**  

   - RS485 bus must use shielded twisted-pair cables, terminated with 120Ω matching resistors, total length ≤1200 meters.  

   - When networking multiple meters, assign a unique communication address (1-247) to each to avoid address conflicts.  

V. Certifications and Compliance**  

- **Domestic Certification**: Passed China 3C certification, compliant with GB/T 17215.321 standards.  

- **International Certification**: Passed EU CE certification (LVD, EMC directives), suitable for export to European markets.  

- **US Market**: Not explicitly UL or CEC certified; recommended for non-mandatory certification scenarios or consult local distributors.  

VI. Selection Recommendations**  

1. **Model Selection**:  

   - **Basic Model**: DDSU666 220V 5(60)A (no communication function), suitable for budget-conscious residential or rental properties.  

   - **Smart Model**: DDSU666 220V 0.25-0.5(80)A (with ModBus communication), suitable for PV or commercial monitoring.  

2. **Alternatives**:  

   - For three-phase metering, choose **DTSU666** (supports 380V three-phase circuits, 80A current).  

   - For high-precision scenarios (e.g., laboratories), select **DDSU666-IX series** (supports 96 single-phase circuit measurements).  

VII. After-Sales Service**  

- **Warranty Policy**: Chint provides **1.5-year warranty**, with free repair or replacement for quality issues (purchase proof required).  

- **Technical Support**: Firmware upgrades, protocol analysis, and other technical services available via the official website or 400 hotline.  

Summary**  

With **high-precision metering**, **flexible communication**, and **compact design**, the Chint DDSU666 is an ideal choice for residential, commercial, and new energy scenarios. Its rail mounting and wide temperature adaptability make it particularly suitable for retrofit projects or complex environments, while the RS485 communication function provides a data foundation for smart grids and energy management. Construction units must strictly follow wiring specifications and provide complete qualifications, while users can purchase through Chint's official website or authorized channels to ensure genuine products and after-sales support.