Function and Usage
The NB8-40J miniature circuit breaker is mainly applicable to the terminal power distribution lines of commercial office buildings, residential buildings, and general industrial applications with AC 40A, providing overload and short-circuit protection for the lines, and can also perform non-frequent switching operations under normal conditions.
Detailed Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| Product Model | | NB8-40J |
| Rated Current (A) | | 1, 2, 3, 4, 6, 10, 16, 20, 25, 32, 40 |
| Rated Voltage (V) | | 230/400 |
| Rated Frequency (Hz) | | 50 |
| Pole Number | | 1P, 2P, 3P, 4P |
| Mechanical Life (Times) | | 15000 |
| Electrical Life (Times) | | 10000 |
| Rated Short-Circuit Breaking Capacity (A) | | 4500 (D), 6000 (B, C) |
| Operational Short-Circuit Breaking Capacity (A) | | 4500 (D), 6000 (B, C) |
| Rated Insulation Voltage (V) | | 500 |
| Rated Impulse Withstand Voltage (1.2/50) (kV) | | 4 |
| Dielectric Test Voltage (V) | | (50Hz, 1 minute) 2000 |
| Humidity and Heat Resistance (GB/T2423.4: 55℃/90~96%, 25℃/95~100%) | | 28 Cycles |
| Vibration Resistance (IEC/EN60068-2-6) | | Places without obvious vibration and impact |
| Terminals | Terminal Type | Post-Type Terminals |
| Minimum Wire Cross-sectional Area (mm²) | 1 |
| Maximum Wire Cross-sectional Area (mm²) | 16 |
| Standard Connection Torque (N·m) | 2 |
| Maximum Allowable Torque (N·m) | 2.5 |
| Wire Insertion Depth (mm) | 10 |
| Reference Temperature (℃) | | 30 |
| Operating Ambient Temperature (℃) | | -35~+70 |
| Storage Ambient Temperature (℃) | | -35~+85 |
| Applicable Altitude (m) | | 2000 |
| Tripping Mechanism | | Thermal-Magnetic Tripping |
| Electromagnetic Tripping Type | B Type (3In~5In) | ■ |
| C Type (5In~10In) | ■ |
| D Type (10In~16In) | ■ |
| Enclosure Flammability Rating | | V0 |
| Wiring Method | | Top or Bottom |
| Installation Method | | TH35-7.5 Standard Rail |
| Pollution Level | | 2 |
| Protection Level | Direct Installation | IP20B |
| Installed in Distribution Box | IP40B |
| Removable Accessories | | S9, V9, XF9, XF9J, OVT-1, OUVT-1 |
