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Chint NBH8-40-B25 MCB – 1P+N – B Curve – 25A – 4.5kA
Chint NBH8-40-B25 25A B curve 1P+N miniature circuit breaker designed for overload and short-circuit protection in low voltage electrical distribution systems.
£7.50
Why Choose the Chint NBH8-40-B25 Miniature Circuit Breaker?
The Chint NBH8-40-B25 is a compact and reliable 25 A miniature circuit breaker (MCB) designed to provide overload and short-circuit protection for low voltage electrical circuits. As part of the Chint NBH8-40 series, it is suitable for residential, commercial and light industrial power distribution applications where dependable circuit protection and safe isolation are required.
This MCB features a B curve tripping characteristic, making it well suited to general electrical circuits with low inrush current, including lighting circuits, small power distribution and resistive loads. Its compact 1P+N configuration helps protect the live conductor while providing convenient switching of both live and neutral within a single modular device.
With a rated current of 25 A and a 230/240 V AC supply rating, the NBH8-40-B25 is designed for use in final distribution boards and consumer unit-style installations. Its DIN rail mounting format allows quick and secure installation in electrical panels while maintaining a neat, professional layout.
Key Advantages
- Compact 25 A miniature circuit breaker for final circuit protection.
- B curve tripping characteristic suitable for low inrush current circuits.
- 1P+N configuration for live and neutral switching in one device.
- Provides protection against overload and short-circuit faults.
- Designed for 230/240 V AC electrical distribution systems.
- DIN rail mounting for fast installation in distribution boards and control panels.
Key Features
- Chint NBH8-40 miniature circuit breaker series.
- 25 A rated current.
- B curve trip characteristic.
- 1P+N pole configuration.
- 230/240 V AC rated operational voltage.
- Protection against overload and short-circuit currents.
- Suitable for isolation and circuit switching.
- 35 mm DIN rail mounting for panel installation.
Reliable Circuit Protection for Electrical Distribution
Miniature circuit breakers such as the Chint NBH8-40-B25 automatically disconnect a circuit when overload or short-circuit conditions occur. This helps protect wiring, connected equipment and electrical installations from damage caused by excessive current.
The B curve trip profile is typically used where starting currents are relatively low, making this device suitable for lighting circuits, socket circuits, small distribution loads and similar applications. Its compact 1P+N construction makes it ideal for modern distribution boards where space-saving protection is required.
Typical Applications
- Residential consumer units and distribution boards.
- Commercial electrical distribution panels.
- Lighting circuits and small power circuits.
- Final circuit protection in low voltage installations.
- Control panels and auxiliary distribution circuits.
- General electrical isolation and switching applications.
Technical Specifications
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| Phase | Single Phase | |
|---|---|---|
| Current | 25 A | |
| Poles | 1-pole + N | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 4.5 kA | |
| Manufacturer | Chint | |
| Series | NBH8-40 | |
| Model | NBH8-40-B25 | |
| Product type | Miniature circuit breaker | |
| Rated current | 25 A | |
| Trip curve | B curve | |
| Number of poles | 1P+N | |
| Rated operational 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 depending on version | |
| Standard | IEC/EN 60898-1 | |
| Energy limiting class | Class 3 | |
| Protection degree | IP20 | |
| Mounting type | 35 mm DIN rail | |
| Terminal connection | Cable or pin-type busbar | |
| Operating temperature | -5°C to +40°C |
Frequently Asked Questions
What is the Chint NBH8-40-B25 used for?
The Chint NBH8-40-B25 is used to protect electrical circuits against overloads and short circuits in residential, commercial and light industrial distribution systems.
What current rating does this MCB have?
This miniature circuit breaker has a rated current of 25 A.
What does B curve mean on the NBH8-40-B25?
The B curve trip characteristic is designed for circuits with low inrush current, such as lighting, resistive loads and general distribution circuits.
What pole configuration does this device use?
The NBH8-40-B25 uses a 1P+N configuration, providing live pole protection with live and neutral switching in a compact DIN rail device.
Where is this circuit breaker typically installed?
It is typically installed on a 35 mm DIN rail inside distribution boards, consumer units or electrical control panels.
Trusted by Electrical Installers Worldwide
Chint NBH8 miniature circuit breakers are widely used by electrical installers, panel builders and maintenance engineers to deliver compact, dependable protection for low voltage distribution circuits.
