Chint NB1-63D3P40 Triple Pole Type D MCB 40A 6kA

The NB1-63D3P40 is a durable and high-capacity miniature circuit breaker (MCB) designed to protect electrical circuits against overload and short-circuit faults. As part of the NB1-63 series, it is widely used in residential, commercial, and light industrial three-phase power distribution systems where reliable protection of higher-load circuits is required.

This model features a 40A rated current with a 6kA breaking capacity, ensuring fast interruption of fault currents to safeguard wiring, equipment, and installations. Its Type D tripping curve is engineered for circuits with very high inrush currents, making it ideal for heavy inductive loads such as motors, transformers, compressors, and welding equipment.

With a 3-pole (3P) configuration, the NB1-63D3P40 ensures simultaneous disconnection of all three phases, providing balanced and secure protection in three-phase systems. It is designed for DIN rail mounting, allowing quick, safe, and standardized installation in distribution boards and control panels.

Key Features:

• Model: NB1-63D3P40
• Type: Miniature Circuit Breaker (MCB)
• Poles: 3P (Three Pole)
• Rated Current: 40A
• Breaking Capacity: 6kA
• Tripping Curve: Type D (10–20 In)
• Mounting: DIN rail installation
• Function: Overload and short-circuit protection