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Chint NB1-63BH2P40 MCB – 2P – B Curve – 40A – 10kA
Chint NB1-63BH2P40 2 pole miniature circuit breaker with 40 A rated current, B curve tripping characteristic and 10 kA breaking capacity for overload and short-circuit protection.
£10.33
Why Choose the Chint NB1-63BH2P40 Miniature Circuit Breaker?
The Chint NB1-63BH2P40 is a compact and dependable miniature circuit breaker (MCB) designed to protect low voltage electrical circuits against overloads and short circuits. As part of the Chint NB1-63H series, it provides reliable circuit protection for residential, commercial and industrial electrical installations where a higher breaking capacity is required.
This 2 pole B curve MCB features a 40 A rated current, making it suitable for higher current radial circuits, distribution boards, socket circuits, control circuits and other low inrush current applications. The B curve tripping characteristic provides fast protection for circuits where high start-up currents are not expected.
With a rated short-circuit breaking capacity of 10 kA and a standard 35 mm DIN rail mounting format, the NB1-63BH2P40 is easy to install within consumer units, distribution boards and electrical control panels. Its 2 pole design enables simultaneous disconnection of both conductors for improved circuit isolation.
Key Advantages
- Compact 2 pole miniature circuit breaker.
- 40 A rated current for higher current circuits.
- B curve trip characteristic for low inrush current loads.
- 10 kA short-circuit breaking capacity.
- Reliable overload and short-circuit protection.
- DIN rail installation in distribution boards and control panels.
Key Features
- Chint NB1-63H series MCB.
- 40 A rated current.
- B curve tripping characteristic.
- 2 pole configuration.
- 10 kA breaking capacity.
- 230 / 400 V AC rated voltage.
- DIN rail mounting.
- Suitable for overload, short-circuit protection and circuit isolation.
Reliable Protection for Low Inrush Current Circuits
Miniature circuit breakers such as the Chint NB1-63BH2P40 automatically disconnect electrical circuits when overloads or short circuits occur. This helps protect wiring, connected equipment and electrical installations from damage caused by excessive current.
The B curve characteristic makes this MCB suitable for low inrush current circuits, including higher current radial circuits, socket circuits, distribution boards, control panels and auxiliary supplies. Its 2 pole construction provides simultaneous switching and protection across both conductors.
Typical Applications
- Residential consumer units.
- Commercial distribution boards.
- Higher current radial circuits.
- Socket outlet circuits.
- Control and auxiliary circuits.
- Electrical installations requiring 40 A protection.
Technical Specifications
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| Current | 40 A | |
|---|---|---|
| Poles | 2-pole | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 10 kA | |
| Manufacturer | Chint | |
| Series | NB1-63H | |
| Model | NB1-63BH2P40 | |
| Product type | Miniature circuit breaker / MCB | |
| Rated current | 40 A | |
| Number of poles | 2 pole | |
| Tripping characteristic | B curve | |
| Rated voltage | 230 / 400 V AC | |
| Rated frequency | 50 / 60 Hz | |
| Rated short-circuit breaking capacity | 10 kA | |
| Rated insulation voltage | 500 V | |
| Rated impulse withstand voltage | 6 kV | |
| Protection rating | IP20 | |
| Mounting type | 35 mm DIN rail | |
| Standards | IEC / EN 60898-1 |
Frequently Asked Questions
What is the Chint NB1-63BH2P40 used for?
The Chint NB1-63BH2P40 protects low voltage electrical circuits against overloads and short circuits, particularly higher current radial, socket and control circuits.
What current rating does this MCB have?
This miniature circuit breaker has a rated current of 40 A.
What does the B curve characteristic mean?
A B curve MCB trips between 3 and 5 times its rated current, making it suitable for circuits with low inrush currents such as lighting, socket and resistive loads.
What is the breaking capacity of this MCB?
The NB1-63BH2P40 has a rated short-circuit breaking capacity of 10 kA.
How is the NB1-63BH2P40 installed?
The device mounts onto a standard 35 mm DIN rail inside consumer units, distribution boards and electrical panels.
Trusted by Electrical Professionals Worldwide
Chint miniature circuit breakers are trusted by electricians, panel builders and maintenance engineers for dependable circuit protection across residential, commercial and industrial electrical installations.
