CHINT NB8-40J Miniature Circuit Breaker (MCB),
delivers dependable overload and short-circuit protection for residential,
commercial, and industrial electrical systems.
Designe for AC 230/400V networks with rated currents from 1A to 40A, the NB8-40J ensures reliable circuit isolation and switching.
Built to IEC 60898-1 standards, it provides 6kA (B, C curves) and 4.5kA (D curve) breaking capacities,
with compact dimensions and easy DIN rail mounting for versatile low-voltage applications.
- Functions: Protection against overload, short-circuit, and for circuit isolation
- Compliant Standards: IEC 60898-1
- Rated Current (In): 1A, 2A, 3A, 4A, 6A, 10A, 16A, 20A, 25A, 32A, 40A
- Rated Voltage (Ue): AC 230/400V
- Rated Frequency: 50Hz
- Number of Poles: 1P, 2P, 3P, 4P
- Tripping Curves:
- B (3–5 In): For people and long cable protection in TN/IT systems
- C (5–10 In): For resistive and inductive loads with low inrush current
- D (10–16 In): For high inrush load circuits (transformers, discharge lamps)
- Rated Breaking Capacity (Icu): 6kA (B, C curves), 4.5kA (D curve)
- Insulation Voltage (Ui): 500V
- Rated Impulse Withstand Voltage (Uimp): 4kV
- Mechanical Life: 15,000 operations
- Electrical Life: 10,000 operations
- Connection Type: Cable or pin-type busbar
- Terminal Size:
- Cable: up to 10 mm²
- Busbar: up to 25 mm²
- Tightening Torque: 2.0 N·m
- Mounting: DIN rail (EN 60715, 35mm) with quick-clip device
- Connection Direction: Top or bottom feed
- Ambient Temperature: –35°C to +70°C (daily avg ≤35°C)
- Storage Temperature: –35°C to +70°C
- Reference Temperature for Setting: 30°C
- Pollution Degree: 2
- Protection Degree: IP20
- Accessories Compatible: S9, V9, XF9, XF9J, OVT-1, OUVT-1
- Dimensions (mm):
- Height: 86
- Width: 13.5 (1P), 27 (2P), 40.5 (3P), 54 (4P)
- Depth: 77 (1P) / 79 (2P–4P)
- Certifications: CE, RoHS, REACH
