chint mcb nb1-63d3p25 25a, 3p 6ka 3p d curve

Why Choose the Chint NB1-63D3P25 Miniature Circuit Breaker?

The Chint NB1-63D3P25 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 NB1-63 series, it provides reliable circuit protection for residential, commercial and light industrial electrical installations.

This 3 pole D curve MCB features a 25 A rated current, making it suitable for three-phase circuits with high inrush characteristics, including transformers, motors, pumps, compressors, discharge lighting and other inductive equipment. The D curve tripping characteristic helps reduce nuisance tripping during equipment start-up while maintaining dependable protection.

With a rated short-circuit breaking capacity of 6 kA and a standard 35 mm DIN rail mounting format, the NB1-63D3P25 is easy to install within distribution boards and electrical control panels. Its 3 pole construction 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.
• D curve trip characteristic for high inrush current loads.
• 6 kA short-circuit breaking capacity.
• Reliable overload and short-circuit protection.
• DIN rail installation in distribution boards and control panels.

Key Features

• Chint NB1-63 series MCB.
• 25 A rated current.
• D curve tripping characteristic.
• 3 pole configuration.
• 6 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: NB1-63
• Model: NB1-63D3P25
• Product type: Miniature circuit breaker / MCB
• Rated current: 25 A
• Number of poles: 3 pole
• Tripping characteristic: D curve
• Rated voltage: 400 V AC
• Rated frequency: 50 / 60 Hz
• Rated short-circuit breaking capacity: 6 kA
• Rated insulation voltage: 500 V
• Rated impulse withstand voltage: 4 kV
• Protection rating: IP20
• Mounting type: 35 mm DIN rail
• Standards: IEC / EN 60898-1

Reliable Protection for High Inrush Three-Phase Circuits

Miniature circuit breakers such as the Chint NB1-63D3P25 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 D curve characteristic trips between ten and fourteen times the rated current, making it suitable for transformers, motors, pumps, compressors, discharge lighting and other equipment with high start-up currents.

Typical Applications

• Three-phase distribution boards.
• Industrial control panels.
• Motor circuits.
• Transformer protection.
• Pumps, compressors and discharge lighting.
• 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.