Function and Application
The NB8-125 plastic enclosed circuit breaker is mainly applicable to the main distribution lines of commercial office buildings, residential buildings, and general industrial applications with AC 50Hz, rated voltage up to 400V, and rated current up to 125A. It provides protection against overload and short circuit in the line, and can also be used for infrequent switching operations under normal conditions.
Details Parameters
| Parameter Category | Parameter Item | Parameter Value |
|---|
| Product Model | | NNB-125 |
| System Parameters | Rated Current (A) | 80, 100, 125 |
| Rated Voltage (V) | AC230/400 |
| Rated Frequency (Hz) | 50Hz |
| Poles | 1P, 2P, 3P, 4P |
| Performance Indexes | Mechanical Life (Times) | 20000 |
| Electrical Life (Times) | 6000, 4000 (125A) |
| Rated Short Circuit Breaking Capacity (A) | 10000 |
| Running Short Circuit Breaking Capacity (A) | 7500 |
| Rated Insulation Voltage (V) | 630 |
| Rated Impulse Withstand Voltage (1.2/50)kV | 6 |
| Dielectric Test Voltage (V) | 2000 (50Hz, 1 minute) |
| Resistance to Humidity and Heat (GB/T 2423.4: 55℃/90~96%, 25℃/95~100%) | 28 Cycles |
| Vibration Resistance (IEC/EN 60688-2-6) | Places without obvious vibration and impact |
| Wiring Terminal | Terminal Form | Column Type Terminal |
| Minimum Wire Cross-sectional Area (mm²) | 25 |
| Maximum Wire Cross-sectional Area (mm²) | 50 |
| Standard Terminal Torque (N·m) | 3.5 |
| Wire Insertion Depth (mm) | 14 |
| Reference Temperature (℃) | 40 |
| Operating Ambient Temperature (℃) | -35~+70 |
| Storage Ambient Temperature (℃) | -35~+85 |
| Applicable Altitude (m) | ≤2000 |
| Tripping Method | Thermal Magnetic Tripping |
| Electromagnetic Trip Type | C Type (6.4in~9.6in) |
| | D Type (9.6in~14.4in) |
| Enclosure Flammability Rating | V-0 |
| Input Method | Top and Bottom Both |
| Pollution Degree | 3 |
| Protection Level | Direct Installation IP20B |
| | Installation Inside Distribution Box IP40B |
| Removable Accessories | S9, V9, XF9, XFJ9, OVT-1, OUVT-1 |
