chint mcb nb1-63bh3p25 25a, 3p 10ka 3p b curve

Why Choose the Chint NB1-63BH3P25 Miniature Circuit Breaker?

The Chint NB1-63BH3P25 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 3 pole B curve MCB features a 25 A rated current, making it suitable for three-phase lighting circuits, control circuits, signalling systems and low inrush distribution applications. The B curve tripping characteristic is designed for resistive loads and circuits with low inrush current.

With a rated short-circuit breaking capacity of 10 kA and a standard 35 mm DIN rail mounting format, the NB1-63BH3P25 is easy to install within distribution boards and electrical control panels. Its 3 pole design provides simultaneous isolation and protection across all three phases.

Key Advantages

• Compact 3 pole miniature circuit breaker.
• 25 A rated current for three-phase circuits.
• B curve trip characteristic for resistive 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.
• 25 A rated current.
• B curve tripping characteristic.
• 3 pole configuration.
• 10 kA breaking capacity.
• 400 V AC rated voltage.
• 35 mm DIN rail mounting.
• Suitable for overload, short-circuit protection and circuit isolation.

Technical Specifications

• Manufacturer: Chint
• Series: NB1-63H
• Model: NB1-63BH3P25
• Product type: Miniature circuit breaker / MCB
• Rated current: 25 A
• Number of poles: 3 pole
• Tripping characteristic: B curve
• Rated voltage: 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 Three-Phase Circuits

Miniature circuit breakers such as the Chint NB1-63BH3P25 automatically disconnect electrical circuits when overloads or short circuits occur. This helps protect wiring, connected equipment and electrical installations from excessive current and fault conditions.

The B curve characteristic trips between three and five times the rated current, making it suitable for resistive loads, lighting circuits, signalling systems and distribution circuits with minimal inrush current.

Typical Applications

• Three-phase distribution boards.
• Industrial control panels.
• Lighting circuits.
• Control and signalling circuits.
• Cable protection.
• Electrical installations requiring 25 A three-phase 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.