Why Choose the ABB S303P-D63NA Miniature Circuit Breaker?
The ABB S303P-D63NA is a compact and high-performance miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in industrial and electrical distribution systems. As part of the ABB System pro M compact S300P series, it combines high breaking capacity with practical DIN-rail installation for professional low-voltage installations.
This circuit breaker features a D tripping characteristic, making it suitable for applications where circuits can experience higher short-duration inrush currents. The 3P+N configuration provides three protected poles with a switched neutral, allowing the device to protect three-phase circuits while also switching the neutral conductor.
With a rated current of 63 A, a 25 kA rated breaking capacity and an AC supply, the S303P-D63NA is suited to demanding industrial installations, distribution circuits, control panels and other applications where dependable circuit protection and compact panel integration are required.
Key Advantages
- Compact miniature circuit breaker designed for industrial and electrical distribution applications.
- 63 A rated current for reliable low-voltage circuit protection.
- D tripping characteristic for circuits subject to higher inrush currents.
- 25 kA rated breaking capacity for high-level short-circuit protection.
- 3P+N configuration with switched neutral for three-phase circuit protection and neutral switching.
- DIN-rail mounting for straightforward installation in distribution boards and control panels.
- Part of the ABB System pro M compact S300P range for professional circuit protection.
Key Features
- ABB System pro M compact S300P series.
- 63 A rated current.
- D tripping characteristic.
- 3P+N configuration with switched neutral.
- 25 kA rated breaking capacity.
- AC supply.
- DIN-rail mounting for efficient panel installation.
- Compact modular design for electrical distribution equipment.
- Reliable overload and short-circuit protection.
- Suitable for industrial and commercial low-voltage installations.
Reliable Circuit Protection for Industrial Installations
Miniature circuit breakers such as the ABB S303P-D63NA protect electrical circuits by automatically disconnecting the supply when an overload or short circuit reaches a level that could otherwise damage conductors and connected equipment. The D tripping characteristic is designed for applications where equipment can produce significant inrush currents during energisation.
The S300P series is designed for demanding industrial and electrical installations, combining high breaking performance with a compact modular format. The S303P-D63NA's 3P+N arrangement provides three protected phases together with a switched neutral, supporting controlled isolation of three-phase circuits in distribution and control applications.
Typical Applications
- Industrial electrical distribution systems.
- Three-phase control and auxiliary circuits.
- Industrial machinery and automation equipment.
- Control panels and electrical switchboards.
- Circuits with higher inrush-current characteristics.
- Commercial and industrial building installations.
- General low-voltage AC circuit protection.
