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Chint
NXB-40 Miniature Circuit Breaker
NXB-40 Miniature Circuit Breaker is designed for overload and short-circuit protection in low-voltage distribution systems. It is suitable for residential, commercial, and industrial applications. The product complies with GB/T 10963.1 and IEC 60898-1 standards and supports rated currents from 6A to 40A.
- Brand
- Chint
- Model
- NXB-40
- Product category
- Circuit Breaker
Product overview
The NXB-40 series Miniature Circuit Breaker is a protection device designed for low-voltage terminal distribution systems. It is mainly used for overload protection and short-circuit protection of electrical circuits.
The product complies with **GB/T 10963.1 and IEC 60898-1 international standards** and has obtained **CCC and CE certifications**, providing reliable electrical performance and safety protection.
The NXB-40 series offers multiple rated current options including **6A, 10A, 16A, 20A, 25A, 32A, and 40A**. It supports **C and D tripping characteristics** to meet different load requirements and application scenarios.
With a compact structure design, the product supports **1P+N pole configuration**. It provides a mechanical endurance of up to **20,000 operations** and an electrical endurance of **10,000 operations**. The rated short-circuit breaking capacity reaches **4500A**, ensuring safe and reliable operation of low-voltage distribution systems.
NXB-40 is widely used in residential distribution boxes, commercial buildings, industrial control cabinets, lighting circuits, and power circuit protection applications.
Specifications
| Parameter | Specification | Unit |
|---|---|---|
| Product Model | NXB-40 | - |
| Product Type | Miniature Circuit Breaker (MCB) | - |
| Applicable Standard | GB/T 10963.1, IEC 60898-1 | - |
| Certification | CCC, CE | - |
| Main Function | Overload protection, Short-circuit protection | - |
| Rated Current (In) | 6A, 10A, 16A, 20A, 25A, 32A, 40A | A |
| Rated Operating Voltage (Ue) | 230 | V |
| Rated Insulation Voltage (Ui) | 500 | V |
| Rated Frequency | 50 | Hz |
| Instantaneous Tripping Characteristic | C, D | - |
| Number of Poles | 1P+N | - |
| Mechanical Endurance | 20000 | Operations |
| Electrical Endurance | 10000 | Operations |
| Rated Short-Circuit Breaking Capacity (Icn) | 4500 | A |
| Service Short-Circuit Breaking Capacity (Ics) | 4500 | A |
| Rated Impulse Withstand Voltage (Uimp) | 4 | kV |
| Rated Current In(A) | Maximum Power Loss (W) |
|---|---|
| 6-10A | 2 |
| 16-25A | 3.5 |
| 32-40A | 5 |
| Number of Devices Installed Together | Derating Factor |
|---|---|
| ≤3 devices | 0.90-0.95In |
| 4-6 devices | 0.80-0.86In |
| 7-9 devices | 0.76-0.78In |
| ≥9 devices | 0.76In |
| Altitude | Correction Factor |
|---|---|
| ≤2000m | In |
| 3000m | 0.96In |
| 4000m | 0.94In |
| 5000m | 0.90In |
- Residential low-voltage distribution systems
- Commercial building power distribution
- Industrial control cabinets
- Lighting circuit protection
- Power circuit protection
- Low-voltage distribution boxes
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