Why Choose the ABB S203-D4NA Miniature Circuit Breaker?
The ABB S203-D4NA is a premium three-pole plus switched neutral (3P+N) miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200 series. Designed to provide dependable overload and short circuit protection, it is ideal for commercial, industrial and OEM electrical installations requiring reliable protection of three-phase circuits with a switched neutral.
Featuring a D curve tripping characteristic and a 4 A rated current, the S203-D4NA is particularly suited to protecting circuits supplying transformers, motors, solenoids and other inductive loads with high inrush currents. Its current limiting design helps minimise fault energy while protecting connected equipment and maintaining system reliability.
Manufactured to ABB's exacting quality standards, the S203-D4NA offers excellent mechanical durability, dependable switching performance and compatibility with ABB's extensive range of System pro M Compact accessories, making it an excellent solution for professional electrical installations.
Key Advantages
- Reliable 3P+N miniature circuit breaker for industrial and commercial applications.
- 4 A rated current with D curve tripping characteristic.
- 6 kA breaking capacity for dependable circuit protection.
- Protects against overloads and short circuits.
- Switched neutral provides additional installation flexibility.
- Compatible with ABB auxiliary contacts and signalling accessories.
Key Features
- ABB System pro M Compact S200 series.
- 4 A rated current.
- D characteristic trip curve.
- Three protected poles plus switched neutral (3P+N).
- 6 kA rated short circuit breaking capacity.
- DIN rail mounting.
- Thermal overload and magnetic short circuit protection.
- Failsafe bi-directional cylinder-lift terminals.
Reliable Protection for Three-Phase Electrical Systems
The ABB S203-D4NA combines thermal overload protection with rapid magnetic short circuit protection to safeguard electrical installations. Its D curve characteristic allows temporary high inrush currents without nuisance tripping, making it ideal for motors, transformers and other inductive loads.
The integrated switched neutral enables simultaneous switching of the neutral conductor alongside the three live phases, making this breaker suitable for modern electrical distribution systems, industrial control panels and OEM equipment.
Typical Applications
- Industrial control panels.
- Motor control circuits.
- Transformer protection.
- OEM machinery.
- Commercial electrical installations.
- Three-phase distribution systems with switched neutral.
