Chint NBH8-40-B04 1P+N B curve 4 A miniature circuit breaker designed for overload and short-circuit protection in low-voltage electrical installations.
£16.66
The Chint NBH8-40-B04 is a compact and dependable 1P+N miniature circuit breaker designed to provide reliable overload and short-circuit protection in low-voltage electrical installations. As part of the proven Chint NBH8 series, it is ideal for residential, commercial and light industrial applications where safe circuit protection and dependable isolation are essential.
Its slim modular construction makes it ideal for installation in consumer units, distribution boards and electrical control panels where space is at a premium. Featuring a clear contact position indicator and quick-fit DIN rail mounting, the NBH8-40-B04 offers straightforward installation and dependable long-term operation.
With a rated current of 4 A, a B curve tripping characteristic and a 1P+N configuration, the NBH8-40-B04 is well suited for lighting circuits, auxiliary supplies, control systems and other low-current applications requiring reliable protection.
The Chint NBH8-40-B04 automatically disconnects the circuit during overload or short-circuit conditions, helping protect wiring, equipment and connected devices from electrical damage. Its B curve characteristic trips between 3 and 5 times the rated current, making it ideal for resistive loads and circuits with minimal inrush current.
The 1P+N configuration protects the live conductor while switching the neutral conductor, providing dependable isolation for compact single-phase electrical installations.
| Current | 4 A |
|---|---|
| Manufacturer | Chint |
| Series | NBH8 |
| Model | NBH8-40-B04 |
| Product type | Miniature circuit breaker |
| Rated current | 4 A |
| Number of poles | 1P+N |
| Tripping curve | B curve |
| Rated voltage | 230 / 240 V AC |
| Rated frequency | 50 / 60 Hz |
| Rated insulation voltage | 500 V |
| Rated impulse withstand voltage | 4 kV |
| Breaking capacity | 4.5 kA or 6 kA |
| Energy limiting class | Class 3 |
| Protection rating | IP20 |
| Standard | IEC / EN 60898-1 |
| Mounting type | 35 mm DIN rail |
| Terminal connection | Cable or pin-type busbar |
| Terminal capacity | 16 mm² cable / 10 mm² busbar |
The NBH8-40-B04 protects low-current electrical circuits against overloads and short circuits while providing switching and isolation.
This model has a rated current of 4 A.
A B curve MCB typically trips between 3 and 5 times its rated current, making it suitable for resistive loads and circuits with low inrush current.
The NBH8-40-B04 has a 1P+N configuration, providing one protected pole and a switched neutral.
It is installed on a standard 35 mm DIN rail inside consumer units, distribution boards and electrical control panels.
Chint NBH8 miniature circuit breakers are trusted by electricians, panel builders and maintenance engineers for reliable circuit protection, compact installation and dependable long-term performance.
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2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...