Why Choose the ABB S203-Z63NA Miniature Circuit Breaker?
The ABB S203-Z63NA is a high-performance 3P+N miniature circuit breaker (MCB) from the trusted ABB System pro M compact S200 series. Designed to provide dependable protection against overloads and short circuits, this MCB is ideal for commercial, industrial and specialist electrical installations requiring a Z characteristic tripping curve for highly sensitive loads.
Featuring ABB's proven thermal and electromechanical tripping technology, the S203-Z63NA delivers fast, reliable circuit protection while maintaining excellent current limiting performance. The compact DIN rail mounted design simplifies installation and supports the addition of auxiliary accessories for increased functionality.
With a 63 A rated current, 3 protected poles plus switched neutral, and a 6 kA breaking capacity, the ABB S203-Z63NA is suitable for protecting sensitive electronic equipment, control circuits and industrial systems where rapid magnetic tripping is essential.
Key Advantages
- 3P+N miniature circuit breaker for three-phase systems with switched neutral.
- 63 A rated current for demanding industrial applications.
- Z characteristic provides rapid magnetic tripping for sensitive loads.
- 6 kA breaking capacity for dependable fault protection.
- Current limiting design helps minimise fault energy.
- Compatible with ABB System pro M compact accessories.
- Suitable for residential, commercial and industrial installations.
Key Features
- ABB System pro M compact S200 series.
- Model: S203-Z63NA.
- Rated current: 63 A.
- Number of poles: 3 protected poles + neutral.
- Z characteristic magnetic trip curve.
- 6 kA rated short-circuit breaking capacity.
- Thermal overload and electromechanical short-circuit protection.
- DIN rail mounting.
- Contact position indication with red ON and green OFF status.
- Expandable with auxiliary contacts, shunt trips and undervoltage releases.
Reliable Circuit Protection for Sensitive Electrical Systems
The ABB S203-Z63NA combines delayed thermal overload protection with rapid electromechanical short-circuit protection, helping to safeguard electrical installations against faults while reducing damage caused by excessive fault currents.
Its Z characteristic makes it particularly suitable for circuits supplying sensitive electronic equipment, control systems and specialised industrial applications where lower magnetic trip thresholds are required compared with conventional B, C or D curve circuit breakers.
Typical Applications
- Industrial control panels.
- PLC and automation systems.
- Sensitive electronic equipment.
- Instrumentation circuits.
- Machine building and OEM equipment.
- Commercial electrical distribution systems.
- Process control installations.
