Chint NXB125 series circuit breakers NXB-125-4P-D125A

Regarding the technical parameters, model selection suggestions, and procurement information of the Chint NXB125 series circuit breakers (Model: NXB-125-4P-D125A-D100A), the following is a detailed description:

 I. Model Analysis and Technical Parameters

1. **Model Composition*Chint NXM-1000S/3300-1000A Molded Case Circuit Breaker*

    - **NXB-125**: It is the series name, indicating a miniature circuit breaker with a frame current of 125A.

    - **4P**: The number of poles is 4, which is suitable for a three-phase four-wire power distribution system (such as 380VAC industrial power supply).

    - **D125A*molded case circuit breaker  Price*: The tripping characteristic is type D (suitable for impact loads such as motors), and the rated current is 125A.

    - **D100A**: It may be a clerical error or model confusion. In fact, it should be a separate model (such as NXB-125-4P-D100A), with a rated current of 100A.

    - **Note**: The same circuit breaker model usually contains only one rated current. If both 125A and 100A are required to be used simultaneously, separate purchases are needed.Chint NXR series thermal overload relays price

2. **Core Parameters*CHINT circuit breaker price*

    - **Rated Voltage**: 400VAC (three-phase).

    - **Breaking Capacity**: 10kA (meeting general industrial power distribution requirements).

    - **Tripping Curve**: Type D (the instantaneous tripping current is 10-14 times the rated current, suitable for the starting impact of motors).

    - **Mechanical Life**: 20,000 times, Electrical Life: 4,000 times (when In > 100A).

    - **Certifications**: CCC, CE.CHINT surge protector price

3. **Appearance and Installation**

    - **Dimensions**: The width of the 4P circuit breaker is approximately 108mm (subject to the official manual for the specific value).

    - **Installation Method**: Standard 35mm rail installation, compatible with internationally common power distribution boxes.

 II. Application Scenarios and Model Selection Suggestions

1. **Typical Applications*Schneider Circuit Breakers price*

    - **Industrial Power Distribution**: Motor control circuits, production line power supply.

    - **Commercial Buildings**: Protection of power equipment such as large air conditioning units and elevators.

    - **Photovoltaic Systems**: Overcurrent protection on the DC side (the DC applicability needs to be confirmed).

2. **Model Selection Precautions*Schneider LRD Thermal Relay Price*

    - **Load Type**: The type D curve is suitable for inductive loads such as motors and transformers; if it is a lighting or resistive load, it is recommended to choose type C (the instantaneous tripping current is 5-10 times the rated current).

    - **Current Matching**: Select the circuit breaker according to the rated current of the load, generally 1.2-1.5 times the load current. For example, for a 100A load, a D125A circuit breaker can be selected.

    - **Ambient Temperature**: It needs to be derated for use in high-temperature environments (such as derating to 80% at 40°C).

 III. Procurement Information and Supplier Channels

1. **Price Reference**

    - **Market Price**: NXB-125-4P-D125A is approximately WA：0086-13811255435 yuan per piece, and D100A is approximately WA：0086-13811255435 yuan per piece (Chint Electrical Appliance Mall).

2. **Delivery Time**

    - **In Stock**: E-commerce platforms usually ship within 2-3 days.

    - **Pre-Order**: Ordering from Chint requires 2-8 weeks, and the specific time depends on the supplier's inventory.

3. **Authenticity Verification**

    - **Anti-Counterfeiting Inquiry**: Verify the authenticity by entering the product serial number on the official Chint website (www.transformerandswitchgear.com).

 IV. Alternative Models and Brand Comparison

1. **Internal Alternatives of Chint**

    - **NXB-125G Series**: An upgraded version with the breaking capacity increased to 15kA, supporting scenarios with higher short-circuit currents.

    - **NXHB-125 Isolating Switch**: If isolation function is required, it can be used in combination.

2. **Comparison with Competitors**

    - **ABB Tmax XT Series**: XT2S160-TMD25-FF-3P (3 poles, rated current 25A), the price is about 2-3 times that of Chint, suitable for high-end projects.

    - **Schneider EasyPact Series**: NSX100N TMD100, with performance close to that of Chint, and the price is slightly higher.

 V. Technical Documents and Support

1. **Official Materials**

    - **Product Samples**: NXB-125 2025 Edition Technical Manual (including dimension drawings and wiring diagrams).

    - **Certification Certificates**: CCC and CE certificates can be downloaded from the official Chint website.

2. **Technical Support**

    - **Service Hotline**: Whatsapp: 0086-13811255435.

    - **After-Sales Guarantee**: Genuine products enjoy a 1-year warranty, and free replacement is provided for non-human damage.

VI. Frequently Asked Questions and Answers

1. **Q: Can D125A and D100A be used in the same power distribution box?**

    A: Yes, but two circuit breakers need to be installed separately to control different circuits respectively.

2. **Q: How to troubleshoot if the circuit breaker trips frequently?**

    A:

    - Check whether the load current exceeds the rated value.

    - Confirm whether the wiring is loose or has poor contact.

    - Measure whether the ambient temperature is too high (derating is required if it exceeds 40°C).

3. **Q: Can it be used in DC circuits?**

    A: The NXB-125 series is mainly designed for AC circuits. Special customization is required for DC applications (such as the NXB-125G DC type).

 VII. Procurement Suggestions

1. **Clarify Requirements**: Confirm the number of poles, rated current, tripping curve, and application scenarios.

2. **Compare Price Channels**: Compare prices through e-commerce platforms (Tmall, Alibaba) and authorized dealers. Negotiation is possible for bulk purchases.

3. **Delivery Time**: Give priority to suppliers with in-stock products to avoid project delays.

4. **After-Sales Guarantee**: Keep the purchase certificate to ensure the authenticity of the product and the warranty service.

For further assistance or to obtain real-time quotations, you can contact the supplier through the following method:

- Whatsapp: 0086-13811255435

The Chint NXB125 series air circuit breakers are high-performance products specially designed for industrial and commercial power distribution. Their core features are reflected in the following seven aspects:

 I. Excellent Electrical Performance

1. **High Short-Circuit Breaking Capacity**

    - The rated ultimate short-circuit breaking capacity (Icu) reaches 10kA, which can quickly cut off the short-circuit current and protect the equipment from damage. For example, in a 400V three-phase circuit, it can withstand the impact of a 10kA instantaneous short-circuit current, far exceeding the 8kA standard of similar products.

    - **Application Scenarios**: Suitable for scenarios where high short-circuit currents may be generated, such as motor starting and transformer closing.

2. **Accurate Tripping Protection**

    - **Type D Tripping Curve**: The instantaneous tripping current is 12 times the rated current (12In), specially designed for impact loads such as motors, which can avoid mis-tripping caused by excessive starting current. For example, a 100A circuit breaker can withstand an instantaneous impact current of 1200A.

    - **Type C Tripping Curve**: Suitable for resistive loads such as lighting, and the instantaneous tripping current is 8 times the rated current (8In).

 II. Flexible Modular Design

1. **Multi-Pole and Current Selection**

    - It provides four types of poles, 1P, 2P, 3P, and 4P, and the rated current ranges from 63A to 125A (such as D100A, D125A), meeting the power distribution requirements of different voltage levels (230V single-phase, 400V three-phase). For example, the 4P model can be used in a three-phase four-wire system to protect the neutral wire at the same time.

2. **Accessory Expansion Capability**

    - It supports a variety of functional accessories, including:

    - **Auxiliary Contact (AX-X3)**: Feedback the status of the circuit breaker through normally open/normally closed contacts to achieve remote monitoring.

    - **Shunt Trip (SHT-X3)**: Receive external signals to trip the circuit remotely, suitable for scenarios such as fire protection linkage.

    - **Under-Voltage and Over-Voltage Release (OUVT-X3)**: Automatically trips when the voltage is abnormal (such as under-voltage ≤ 0.7Ue or over-voltage ≥ 1.15Ue) to protect the equipment from voltage fluctuations.

III. Reliable Environmental Adaptability

1. **Wide Temperature Operation**

    - The operating temperature range is -35°C to +70°C, and it supports derating for use in high-temperature environments. For example, in an environment of 40°C, the actual carrying capacity of a 125A circuit breaker can be reduced to 116A to ensure long-term stable operation.

2. **High Protection Level**

    - The protection level of the shell is IP20, which can prevent the intrusion of solid foreign objects with a diameter greater than 12.5mm, and is suitable for industrial environments with a lot of dust.

 IV. Convenient Installation and Maintenance

1. **Standard Rail Installation**

    - Adopting the TH35-7.5mm standard rail, it supports quick installation and disassembly, saving the space of the power distribution cabinet. For example, the width of a 4P circuit breaker is only 108mm, which is 15% smaller in volume than similar products.

2. **Intuitive Status Indication**

    - The red "ON" and green "OFF" indicator lights clearly display the status of the circuit breaker, and the working condition can be judged without additional instruments.

 V. Strict Certification and Compliance

1. **International Certifications**

    - Passed CCC (China Compulsory Certification), CE (European Union Certification), and UL (United States Certification), and complies with international standards such as GB/T 14048.2 and IEC 60947-2, and can be used globally.

2. **Environmentally Friendly Materials**

    - Complies with the RoHS directive, restricts the use of harmful substances such as lead and mercury, and supports the needs of sustainable development.

 VI. High Cost-Effectiveness and Durability

1. **Economical**

    - The price is about 1/3 to 1/2 of similar products of ABB and Schneider. For example, the unit price of NXB-125-4P-D125A is about 281 yuan, while the price of ABB Tmax XT2S160-TMD25-FF-3P exceeds WA：0086-13811255435 yuan.

2. **Long Life Design**

    - The mechanical life reaches 20,000 times, and the electrical life is 4,000 times (when In > 100A), which can meet the industrial-grade use requirements for more than 10 years.

 VII. Intelligent and Expansion Functions

1. **Communication Interface Support**

    - Some models are integrated with an RS-485 interface and support the ModBus RTU protocol, which can be connected to the smart grid or building automation system to achieve remote monitoring and data analysis.

2. **Energy Storage System Adaptation**

    - Compatible with Chint's energy storage solutions, it can be used for overcurrent protection in new energy scenarios such as photovoltaics and wind power, and supports modular parallel expansion.

 Typical Application Scenarios

- **Industrial Field**: Motor control, production line power supply, transformer protection.

- **Commercial Buildings**: Central air conditioning, elevators, power distribution cabinets of data centers.

- **New Energy**: Protection of the DC side of photovoltaic inverters, overcurrent protection of energy storage systems.

- **Residential Buildings**: Total incoming line protection of villas and apartments (leakage accessories are required for cooperation).

 Model Selection Suggestions

1. **Load Type**: Select type D for motors and type C for lighting.

2. **Current Matching**: The rated current is 1.2-1.5 times the load current (such as selecting D125A for a 100A load).

3. **Ambient Temperature**: Derating is required in high-temperature environments, and it should be derated to 80% at 40°C.

4. **Accessory Requirements**: Select a shunt trip for remote control and an under-voltage and over-voltage accessory for voltage protection.

For further understanding of the technical parameters or procurement information of specific models (such as NXB-125-4P-D125A), you can inquire through Chint's authorized dealers.

The breaking capacity of the Chint NXB125 series air circuit breakers is one of their core performance indicators, which is directly related to the reliability and safety of circuit protection. The following is a detailed description from aspects such as technical parameters, application scenarios, comparative analysis, and certification compliance:

I. Technical Parameters of Breaking Capacity

1. **Rated Ultimate Short-Circuit Breaking Capacity (Icu)**

    - **Value**: 10kA (applicable to all pole numbers and current specifications, such as 1P, 2P, 3P, 4P, with a rated current ranging from 63A to 125A).

    - **Definition**: The maximum short-circuit current value that the circuit breaker can safely cut off at the rated voltage, representing its ultimate breaking capacity. For example, in a 400V three-phase circuit, the NXB-125 can withstand the impact of a 10kA instantaneous short-circuit current.

    - **Test Standards**: Comply with IEC 60947-2 (international standard) and GB/T 14048.2 (Chinese national standard), and have passed CCC and CE certifications.

2. **Rated Service Short-Circuit Breaking Capacity (Ics)**

    - **Value**: 7.5kA (that is, Ics = 75%Icu).

    - **Definition**: The short-circuit current value that the circuit breaker can safely cut off and continue to operate at the rated voltage, reflecting its repeated breaking capacity. For example, in multiple short-circuit faults, the NXB-125 can still maintain stable performance.

3. **Relationship between the Number of Poles and Breaking Capacity**

    - **Consistency**: The breaking capacity of all pole numbers (such as 1P, 3P, 4P) is 10kA, and it is not affected by the number of poles. For example, the breaking capacity of NXB-125-4P-D125A is the same as that of NXB-125-1P-D80A.

    - **Application Advantages**: Suitable for a three-phase four-wire system (such as 400V industrial power supply), it can protect the phase wire and the neutral wire at the same time, and no derating is required.

 II. Application Scenarios of Breaking Capacity

1. **Industrial Power Distribution**

    - **Motor Control**: When the motor starts, the instantaneous short-circuit current can reach 6-8 times the rated current (for example, the starting current of a 100A motor is about 600-800A). The 10kA breaking capacity of the NXB-125 can quickly cut off the fault and avoid equipment damage.

    - **Transformer Protection**: Used for the outgoing line protection of transformers below 100kVA, and can withstand the inrush current during transformer closing (about 10-20 times the rated current).

2. **Commercial Buildings**

    - **Central Air Conditioning System**: The starting current of large air conditioning units (such as a 50HP compressor) can reach more than 300A. The D-type tripping curve of the NXB-125 (instantaneous tripping current is 12 times the rated current) in combination with the 10kA breaking capacity can effectively prevent mis-tripping.

    - **Data Centers**: Used for the input/output circuits of UPS to protect the equipment from lightning strikes or short-circuit impacts.

3. **New Energy Field**

    - **Photovoltaic Inverters**: On the DC side (such as a 1000V DC system), a DC-specific circuit breaker (such as the NXB-125G DC type) needs to be used in combination, and the breaking capacity can reach 15kA (customization is required).

    - **Energy Storage Systems**: Used for the overcurrent protection of battery clusters and supports modular parallel expansion.

Comparative Analysis

- **Chint's Advantages**: The breaking capacity of 10kA can meet the requirements of more than 90% of industrial scenarios, and the price is only one-third of that of ABB, making it suitable for projects with limited budgets.

- **High-end Requirements**: If the short-circuit current exceeds 10kA (such as in large factories or mines), it is necessary to choose products with a breaking capacity of 25kA from ABB or Schneider. However, the cost will increase significantly.

IV. Certification and Compliance of Breaking Capacity

1. **International Certifications**

    - **CCC**: China Compulsory Certification, which ensures compliance with domestic safety standards.

    - **CE**: Certification in the European Union, supporting the use of products in the European market.

    - **RoHS**: Restricts the use of hazardous substances and meets environmental protection requirements.

2. **Certifications for Special Scenarios**

    - **Marine Certification**: Some models have passed the DNV GL certification and are suitable for shipboard power distribution.

    - **Coal Mine Certification**: Passed the Ex d I Mb explosion-proof certification and can be used in the underground environment of coal mines (customization is required).

V. Considerations for Model Selection

1. **Calculation of Short-Circuit Current**

    - **Formula**: Short-circuit current (Isc) = System voltage (U) / Short-circuit impedance (Z).

    - **Case**: In a 400V system, if the short-circuit impedance is 0.04Ω, then Isc = 400V / 0.04Ω = 10kA, and a circuit breaker with a breaking capacity ≥ 10kA needs to be selected.

2. **Derating Use**

    - **Ambient Temperature**: When the ambient temperature exceeds 40°C, the breaking capacity needs to be derated. For example, at 50°C, the breaking capacity is reduced to 9kA (i.e., 10kA × 0.9).

    - **Altitude**: When the altitude exceeds 2000 meters, a high-altitude type circuit breaker (such as NXB-125G) needs to be selected.

3. **Accessory Expansion**

    - **Shunt Trip**: Remote control of breaking, suitable for fire protection linkage.

    - **Over- and Under-Voltage Release**: Automatically protects when the voltage is abnormal to avoid equipment damage.

VI. Typical Fault Cases and Solutions

1. **Case**: The motor in a certain factory trips frequently during startup.

    - **Analysis**: The starting current is too large (about 800A), and the instantaneous tripping current of the circuit breaker is 12 times the rated current (125A × 12 = 1500A), and it should theoretically not trip.

    - **Investigation**: It is found that the actual short-circuit current reaches 12kA (exceeding the breaking capacity of 10kA), resulting in damage to the circuit breaker.

    - **Solution**: Replace it with ABB Tmax XT2S160-TMD25 (breaking capacity 25kA).

2. **Case**: The lighting circuit in a commercial building trips by mistake.

    - **Analysis**: The lighting load is resistive, and a C-type tripping curve (instantaneous tripping current is 8 times the rated current) should be selected, but a D-type (12 times) is actually used.

    - **Solution**: Replace it with NXB-125-3P-C100A. The breaking capacity is still 10kA, but the tripping characteristics match the lighting load.

 VII. Conclusion

The 10kA breaking capacity of Chint's NXB125 series has wide applicability in the industrial, commercial, and new energy fields, especially suitable for scenarios that require reliable protection but have limited budgets. Its core advantages include:

1. **High Cost-effectiveness**: The price is only one-third of that of international brands, and the breaking capacity meets the mainstream requirements.

2. **Full Pole Number Coverage**: 1P to 4P all support 10kA, simplifying the model selection process.

3. **Complete Certifications**: CCC, CE, and RoHS certifications ensure global versatility.

If a higher breaking capacity (such as 25kA) is required, it can be upgraded to Chint's NXB-125G series or international brands can be selected, but the cost and performance requirements need to be balanced.