chint mcb nb1-63bh2p40 40a, 2p 10ka dp b curve

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.

Technical Specifications

• 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

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.

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.