CHINT NB7 Miniature Circuit Breaker (MCB),
is designe for overload and short-circuit protection in AC circuits up to 240/415V with rated currents up to 63A.
Built to comply with IEC 60898-1, it provides reliable circuit isolation and non-frequent switching.
With B, C, and D tripping curves and a breaking capacity of up to 6kA,
the NB7 ensures dependable protection in industrial, commercial, and residential installations.
- Standard Compliance: IEC 60898-1
- Function: Overload and short-circuit protection; circuit switching and isolation
- Rated Frequency: 50Hz / 60Hz
- Rated Voltage (Ue):
- 1P: 240V / 415V AC
- 2P, 3P, 4P: 415V AC
- Rated Current (In): 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A, 50A, 63A
- Tripping Characteristics:
- Type B (3–5 In) – for resistive loads such as lighting and heating
- Type C (5–10 In) – for inductive loads such as motors
- Type D (10–16 In) – for high inrush current circuits like transformers or discharge lamps
- Rated Short-Circuit Capacity (Icn):
- 6kA for 1–40A (B, C types)
- 4.5kA for 50–63A (B, C, D types)
- Number of Poles: 1P, 2P, 3P, 4P
- Mechanical Life: ≥10,000 operations
- Electrical Life: ≥4,000 operations
- Wiring Capacity: Suitable for copper conductors up to 25mm²
- Terminal Type: Screw terminal with hold-down torque of 2 N·m
- Recommended Wire Size:
- 1–6A → 1 mm²
- 10A → 1.5 mm²
- 16–20A → 2.5 mm²
- 25A → 4 mm²
- 32A → 6 mm²
- 40–50A → 10 mm²
- 63A → 16 mm²
- Mounting: DIN rail (35mm)
- Dimensions:
- Height: 81.5mm
- Width (per pole): 18mm
- Depth: 72mm (1P) / 80mm (multi-pole)
- Connection Direction: Top or bottom feed
- Operating Environment: Industrial, commercial, and residential applications
