CHINT NB7 miniature circuit breaker is designed for AC 50Hz/60Hz low-voltage distribution circuits and provides reliable overload and short-circuit protection for distribution boards, control panels, building electrical circuits, and export-oriented panel assembly applications. The NB7 series supports B / C / D tripping curves, 1P to 4P pole configurations, and DIN rail installation for residential, commercial, and industrial power distribution systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model Series | NB7 |
| Type | Miniature Circuit Breaker (MCB) |
| Trip Curve | B / C / D |
| Rated Current | 1A – 63A |
| Pole Number | 1P / 2P / 3P / 4P |
| Rated Voltage | 1P: 240/415V AC; 2P / 3P / 4P: 415V AC |
| Rated Frequency | 50Hz / 60Hz |
| Breaking Capacity | 6kA for B/C type 1–40A and D type 1–63A; 4.5kA for B/C type 50–63A |
| Electrical Life | ≥ 4,000 operations |
| Mechanical Life | ≥ 10,000 operations |
| Terminal Capacity | Copper conductor up to 25mm² |
| Tightening Torque | 2 N·m |
| Standard | IEC 60898-1 |
| Application | Low-voltage distribution / Residential and commercial panels / DIN rail mounting |
