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Chint NB1-63D4P20 MCB – 4P – D Curve – 20A – 6kA
Chint NB1-63D4P20 20A four pole D curve miniature circuit breaker with 6kA breaking capacity for overload, short circuit and isolation protection in commercial and industrial electrical installations.
£24.79
Why Choose the Chint NB1-63D4P20 Miniature Circuit Breaker?
The Chint NB1-63D4P20 is a dependable four-pole miniature circuit breaker (MCB) designed to provide reliable overload, short circuit and isolation protection for low-voltage electrical installations. As part of the trusted Chint NB1-63 series, it is engineered to deliver long-lasting protection across commercial, industrial and OEM applications.
Featuring a D curve tripping characteristic, this MCB is ideal for circuits supplying equipment with high inrush currents such as motors, transformers, compressors and other inductive loads. Its compact modular construction enables straightforward installation into distribution boards and electrical control panels using a standard DIN rail.
With a 20 A rated current, 6 kA breaking capacity and a four-pole configuration, the NB1-63D4P20 offers dependable protection and simultaneous isolation of all live conductors in three-phase electrical systems.
Key Advantages
- Reliable overload and short circuit protection.
- 20 A rated current for commercial and industrial circuits.
- D curve tripping characteristic for high inrush current applications.
- 6 kA breaking capacity for dependable fault protection.
- Four-pole design for complete circuit isolation.
- Compact DIN rail mounting for quick installation.
- Suitable for OEM machinery, control panels and distribution boards.
Key Features
- Chint NB1-63 miniature circuit breaker series.
- 20 A rated current.
- D curve magnetic tripping characteristic.
- 4 pole (4P) configuration.
- 6 kA rated breaking capacity.
- Overload, short circuit and isolation protection.
- Suitable for AC 50/60 Hz electrical systems.
- DIN rail mounted modular design.
Reliable Protection for High Inrush Current Circuits
Miniature circuit breakers automatically disconnect electrical circuits during overload or short circuit conditions, helping to protect wiring, connected equipment and personnel. The NB1-63D4P20 combines thermal and magnetic trip mechanisms to provide fast and dependable fault protection.
Its D curve characteristic is specifically designed for circuits with high starting currents, making it suitable for motors, transformers and other inductive equipment while helping minimise nuisance tripping during normal operation.
Typical Applications
- Industrial distribution boards.
- Motor and transformer circuits.
- Three-phase electrical installations.
- Machine building and OEM equipment.
- Commercial control panels.
- Power distribution systems with inductive loads.
Technical Specifications
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| Current | 20 A | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 4-pole | |
| Device Type | MCB | |
| Trip Curve | D curve | |
| Breaking Capacity | 6 kA | |
| Manufacturer | Chint | |
| Series | NB1-63 | |
| Model | NB1-63D4P20 | |
| Product type | Miniature Circuit Breaker (MCB) | |
| Rated current | 20 A | |
| Number of poles | 4 Pole | |
| Tripping characteristic | D Curve | |
| Rated breaking capacity | 6 kA | |
| Rated voltage | 400 V AC | |
| Rated frequency | 50 / 60 Hz | |
| Rated insulation voltage | 500 V | |
| Rated impulse withstand voltage | 4 kV | |
| Standard | IEC/EN 60898-1 | |
| Mounting type | 35 mm DIN rail | |
| Protection rating | IP20 | |
| Mechanical life | Up to 20,000 operations | |
| Electrical life | Up to 4,000 operations | |
| Width | 18 mm per pole |
Frequently Asked Questions
What is the Chint NB1-63D4P20 used for?
It protects four-pole electrical circuits against overloads and short circuits while providing safe isolation for maintenance.
What current rating does this miniature circuit breaker have?
The NB1-63D4P20 has a rated current of 20 A.
Why choose a D curve circuit breaker?
D curve MCBs are designed for circuits with high inrush currents, including motors, transformers and other inductive equipment.
What is the breaking capacity of this MCB?
This model provides a rated short circuit breaking capacity of 6 kA.
How is the NB1-63D4P20 installed?
The breaker is designed for installation onto a standard 35 mm DIN rail inside electrical distribution boards and control panels.
Trusted by Electrical Professionals Worldwide
Chint NB1 miniature circuit breakers are trusted by electricians, panel builders and industrial engineers for dependable overload protection, reliable fault interruption and long service life across demanding electrical installations.
