Chint's NB1-63DC series DC circuit breakers

Product description

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:

I. Core Technical ParametersSchneider Circuit Breakers Price

1. Basic Specifications

Item	Parameter
Rated Voltage	DC 250V, 500V, 1000V (Breaking capacity varies with voltage level)
Rated Current	1~63A (1P/2P/4P optional, Tripping curve: Type C 5-10In, Type D 10-14In)
Breaking Capacity	- DC 250V: 10kA (Type C)
	- DC 500V: 8kA (Type C)
	- DC 1000V: 6kA (Type C)
Arc Extinguishing Method	Air arc extinguishing + magnetic blowout technology (Accelerates arc extinguishing through the magnetic field, suitable for DC highly inductive loads)
Tripping Characteristics	Overload Protection: Inverse time-limit characteristic, in line with IEC 60947-2 standard.
Tripping Characteristics	Short-circuit Protection: Instantaneous tripping, Type C (5-10In), Type D (10-14In)

2. Environmental and Mechanical Performance

Item	Parameter
Operating Temperature	-35℃~+70℃ (Wide temperature design, adaptable to harsh environments)
Protection Level	IP20 (Front protection)
Installation Method	35mm standard rail installation (Supports DIN EN 50022)
Wiring Specification	Main circuit: 2.5~16mm² single-core/stranded wire (M4 screw)

3. Certifications and StandardsChint NXR series thermal overload relays price

- **International Certifications**: CCC, CE, EAC, TÜV, CB, SEMKO.

- **Standards Compliance**: GB/T 14048.2, IEC 60947-2, RoHS environmental protection directive.

II. Analysis of Key Features

1. 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.

2. Intelligent Tripping and Protection

- **Overload Protection**: Bimetallic inverse time-limit tripping, the larger the current, the shorter the tripping time (for example: it will act within 2 minutes at 1.5 times the rated current).

- **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 (such as motors).

3. Extended FunctionsCHINT surge protector price

- **Auxiliary Contacts**: 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), etc. for extended functions.

III. Selection and Application Scenarios

1. Selection Guide

1. **Voltage Matching**: Select the corresponding model according to the system voltage (for example, choose NB1-63DC/500V for DC 500V).

2. **Current Calculation**:

- **Continuous Load**: Rated current ≥ 1.2 times the load current.

- **Impact Load**: Type D tripping curve, rated current ≥ (Load starting current / 10).

3. **Breaking Capacity**: Ensure that the breaking capacity (Icu) of the circuit breaker ≥ the system short-circuit current.

2. Typical Applications

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

IV. Installation and Maintenance

1. Installation Key Points

- **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.

- **Environmental Requirements**: Avoid using in environments with high humidity (>90%RH) or corrosive gases.

2. Maintenance Suggestions

- **Regular Inspection**: Clean the contacts every quarter and check the flexibility of the tripping mechanism.

- **Life Management**: Mechanical life ≥ 200,000 times, electrical life ≥ 100,000 times (DC-21A load).

- **Fault Troubleshooting**: After tripping, confirm the cause of the fault, and manually disconnect the power supply before resetting.

V. Comparison and Alternative Solutions

Model	Voltage Range	Breaking Capacity	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	6kA (AC)	Suitable for both AC and DC, an economical choice with lower breaking capacity
NSX400N(Schneider)	DC 1000V	50kA	High short-circuit breaking capacity, suitable for large-scale energy storage systems, with a higher price

VI. Precautions

1. **Derating for Use**: When the ambient temperature exceeds 40℃, select the rated current according to **derating 5% for every 10℃ increase**.

2. **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.

3. **Alternative Models**: 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 website](https://www.chint.net) or contact local technical support.