Chint D Series Miniature Circuit Breakers

Chint D Series Miniature Circuit Breakers (usually referring to products with D-type tripping characteristics) are low-voltage protection devices designed for high inrush current loads, widely used in industrial, commercial and residential power distribution systems.

 I. Core Features and Technical Parameters

1. **Tripping Characteristics (D-type Curve)**  

   The tripping current of D-type circuit breakers is **10-20 times** the rated current, suitable for equipment with large starting currents, such as motors, transformers, solenoid valves, etc. For example, a D-type circuit breaker with a rated current of 32A can trip quickly at 320-640A, effectively protecting the equipment from short-circuit impact.

2. **Voltage and Current Ranges**  

   - **Rated Voltage**: AC 230V (1P) or 400V (2P/3P/4P).  

   - **Rated Current**: Covering 6-63A (such as NXB-63 D-type), some models can reach 125A (such as DZ158-125H).  

   - **Breaking Capacity**: Common ones are 4.5kA (such as DZ47LE-63 D-type) or 6kA (such as DZ47-60), and high-end models like DZ158-125H can reach 10kA.

3. **Certifications and Standards**  

   - Domestic: Compliant with GB/T 10963.1 and IEC 60898-1 standards, and obtained CCC certification.  

   - International: Some models (such as DZ158-125H) have passed UL and CE certifications, suitable for the North American and European markets.

 II. Typical Application Scenarios

1. **Industrial Field**  

   - Motor Control Centers (MCC): Protect the instantaneous high current when the motor starts.  

   - Power equipment: Such as water pumps, air compressors, conveyor belts, etc., to prevent short-circuit damage.

2. **Commercial and Residential**  

   - High-power electrical appliances: Air conditioners, water heaters, charging piles, etc., replacing C-type circuit breakers to cope with inrush currents.  

   - Special loads: Such as welding machines, LED lighting systems (including drive power supplies), etc.

3. **Special Scenarios**  

   - Temporary power supply: Places that require frequent starting and stopping of equipment, such as construction sites and exhibitions.  

   - Harsh environments: IP20 protection rating is dust-proof, but humid or corrosive environments should be avoided.

 III. Models and Product Lines

1. **Mainstream Models**  

   - **DZ47-D Series**: Classic model, breaking capacity 6kA, pole numbers 1-4P, suitable for conventional power circuits.  

   - **NXB-63 D-type**: New generation product, compact in size, breaking capacity 6kA, supporting rail mounting, covering 6-63A.  

   - **DZ158-125H**: High breaking capacity (10kA), suitable for industrial power distribution with high short-circuit risk.

2. **Residual Current Protection Type**  

   - DZ47LE-63 D-type: Integrated residual current protection (30mA/50mA), used in humid environments or places with high personal safety requirements.  

   - DZ158LE-125H: Equipped with both 10kA breaking capacity and residual current protection, suitable for industrial-grade applications.

 IV. Key Points for Selection and Installation

1. **Selection Recommendations**  

   - **Load Matching**: Select the D-type tripping curve according to the equipment's starting current. For example, motors usually choose D-type with 10-14 times the rated current.  

   - **Breaking Capacity**: Select according to the short-circuit current level. For example, 6kA can be selected for residential power distribution, and 10kA or above is required for industrial scenarios.  

   - **Pole Number Selection**: 1P or 2P for single-phase loads, 3P or 4P for three-phase loads.

2. **Installation Requirements**  

   - **Environmental Conditions**: Temperature -5℃~+40℃, humidity ≤90% (no condensation), altitude ≤2000m.  

   - **Installation Method**: Vertically installed on TH35 rails, with reserved heat dissipation space, and the wire cross-sectional area should match the rated current.  

   - **Professional Operation**: Must be installed by certified electricians to ensure firm wiring and avoid overload operation.

V. Purchase and Certification

1. **Price Range**  

   - Basic models (such as DZ47-D 1P 16A): About 5-10 yuan each.  

   - High-end models (such as NXB-63 D-type 4P 63A): About 50-100 yuan each.  

   - Residual current protection type: The price increases by 30%-50%, such as DZ47LE-63 D-type is about 30-60 yuan each.

2. **Purchase Channels**   

   - **North American Market**: Models with UL certification (such as DZ158-125H) can be purchased through electrical distributors via Whatsapp: 0086-13811255435. The certification status of specific models needs to be confirmed.

3. **Warranty and Service**  

   - Chint provides a 1-2 year warranty, and non-human damage can be replaced for free.  

   - Technical support: The official website provides manual downloads and customer service consultation.

VI. Comparison with C-type Circuit Breakers

 VII. Notes

1. **Compatibility**  

   - D-type circuit breakers cannot replace C-type ones in lighting circuits, otherwise, overload risks may occur due to insufficient sensitivity.  

   - Residual current protection types need to be used in conjunction with grounding systems to ensure personal safety.

2.**Maintenance and Testing**  

   - Regularly check whether the terminal blocks are loose, and have professionals test the tripping function every 2-3 years.  

   - The circuit breaker needs to be replaced after a short circuit and cannot be manually reset.

3. **Differences in International Standards**  

   - Export models (such as UL-certified models) may have different parameters from domestic models, so the purpose should be clearly defined when purchasing.

With the above information, users can select a suitable Chint D-type miniature circuit breaker according to their specific needs and ensure that the installation and use comply with safety regulations. If it is to be used in North America, it is recommended to give priority to models clearly marked with UL certification (such as DZ158-125H) and consult local electrical specifications.