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The following is a detailed technical analysis and application guide for Chint’s NB1-63DC series DC circuit breakers. It is compiled in combination with official materials and industry standards, covering core performance, selection key points, and typical scenarios:
- Parametri tecnici fondamentali
- Specifiche di base
| Item | Parametro |
| Tensione nominale | DC 250V, 500V, 1000V (Breaking capacity varies with voltage level) |
| Corrente nominale | 1~63A (1P/2P/4P optional, Curva di intervento: Type C 5-10In, Type D 10-14In) |
| Capacità di interruzione | – DC 250V: 10IL (Tipo C) |
| – DC 500V: 8IL (Tipo C) | |
| – DC 1000V: 6IL (Tipo C) | |
| Arc Extinguishing Method | Air arc extinguishing + magnetic blowout technology (Accelerates arc extinguishing through the magnetic field, suitable for DC highly inductive loads) |
| Caratteristiche di intervento | Overload Protection: Inverse time-limit characteristic, in line with IEC 60947-2 standard. |
| Short-circuit Protection: Instantaneous tripping, Tipo C (5-10In), Tipo D (10-14In) |
- Environmental and Mechanical Performance
| Item | Parametro |
| Operating Temperature | -35℃~+70℃ (Wide temperature design, adaptable to harsh environments) |
| Protection Level | IP20 (Front protection) |
| Metodo di installazione | 35mm standard rail installation (Supports DIN EN 50022) |
| Wiring Specification | Circuito principale: 2.5~16mm² single-core/stranded wire (M4 screw) |
- Certificazioni e standard
International Certifications: CCC, CE, EAC, TÜV, CB, SEMKO.
Standards Compliance: GB/T 14048.2, CEI 60947-2, RoHS environmental protection directive.
- Analysis of Key Features
- DC-specific Design
Arc Extinguishing Optimization: Adopts magnetic blowout arc extinguishing technology, which quickly stretches and cools the arc through the magnetic field to solve the problem of difficult arc extinguishing in DC circuits.
Polarity Protection: No built-in reverse connection protection, and anti-reverse connection function needs to be achieved through an external diode or MOS tube circuit.
- Intelligent Tripping and Protection
Overload Protection: Bimetallic inverse time-limit tripping, the larger the current, the shorter the tripping time (Per esempio: it will act within 2 minutes at 1.5 volte la corrente nominale).
Short-circuit Protection: The electromagnetic trip unit responds instantaneously. Type C is suitable for conventional loads (such as LED lighting), and Type D is suitable for high-impact loads (come i motori).
- Extended Functions
Contatti ausiliari: Supports external connection of OF (auxiliary contact) and SD (alarm contact) to achieve indication of opening and closing states or remote monitoring.
Accessory Compatibility: Can be equipped with shunt trip units (XF9), undervoltage trip units (MN), ecc. for extended functions.
III. Selection and Application Scenarios
- Selection Guide
- Voltage Matching: Select the corresponding model according to the system voltage (Per esempio, choose NB1-63DC/500V for DC 500V).
- Current Calculation:
Continuous Load: Corrente nominale ≥ 1.2 times the load current.
Impact Load: Type D tripping curve, rated current ≥ (Load starting current / 10).
- Capacità di interruzione: Ensure that the breaking capacity (Icu) of the circuit breaker ≥ the system short-circuit current.
- Applicazioni tipiche
| Scenario | Model Recommendation | Configuration Description |
| Photovoltaic String Protection | NB1-63DC/500V C16A | Suitable for 1500V photovoltaic systems (Needs to be derated for use), protects the string from overload and short-circuit |
| Energy Storage System | NB1-63DC/1000V D25A | High short-circuit breaking capacity, protects the battery pack and inverter interface |
| Industrial DC Motor | NB1-63DC/250V D32A | Type D tripping curve, can withstand the starting impact current of the motor |
| Communication Base Station | NB1-63DC/48V C6A | Low voltage and high reliability, protects the power supply of communication equipment |
- Installation and Maintenance
- Punti chiave dell'installazione
Wiring Specification: The main circuit wiring needs to be tightened to a torque of 6N·m to avoid loose connection and heat generation.
Polarity Confirmation: Connect the positive and negative poles strictly according to the markings to avoid damage to the circuit breaker due to reverse connection.
Requisiti ambientali: Avoid using in environments with high humidity (>90%RH) or corrosive gases.
- Maintenance Suggestions
Ispezione regolare: Clean the contacts every quarter and check the flexibility of the tripping mechanism.
Life Management: Mechanical life ≥ 200,000 volte, electrical life ≥ 100,000 volte (DC-21A load).
Fault Troubleshooting: After tripping, confirm the cause of the fault, and manually disconnect the power supply before resetting.
- Comparison and Alternative Solutions
| Modello | Intervallo di tensione | Capacità di interruzione | Features |
| NB1-63DC | DC 250~1000V | 6~10kA | Magnetic blowout arc extinguishing, supports wide temperature environment, suitable for highly inductive loads |
| NB1Z-63 | AC/DC 220~400V | 6IL (AC) | Suitable for both AC and DC, an economical choice with lower breaking capacity |
| NSX400N(Schneider) | DC 1000V | 50IL | High short-circuit breaking capacity, suitable for large-scale energy storage systems, with a higher price |
- Precauzioni
- Derating for Use: When the ambient temperature exceeds 40℃, select the rated current according to derating 5% for every 10℃ increase.
- Short-circuit Withstand: The breaking capacity needs to match the system short-circuit current, otherwise it may lead to damage to the circuit breaker or the risk of fire.
- Modelli alternativi: If a higher breaking capacity is required, Chint’s NB1-63H (AC) or NB1-DC (DC-specific, breaking capacity 15kA) can be selected.
For detailed technical manuals or customized solutions, you can visit Chint’s official web siteor contact local technical support.
