Why Choose the ABB S303P-C3NA Miniature Circuit Breaker?
The ABB S303P-C3NA (2CDS383103R0034) is a high-performance three-phase plus switched neutral miniature circuit breaker designed to protect industrial and commercial electrical installations against overloads and short circuits. Part of the robust ABB S300P series, it combines dependable circuit protection with a high breaking capacity for demanding distribution and control applications.
The S303P-C3NA incorporates three protected phase poles and an additional switched neutral pole. This 3P+N configuration enables simultaneous isolation of all conductors while providing thermal and magnetic protection to the three phase conductors. Fail-safe screw terminals and DIN rail mounting support secure wiring and straightforward installation within distribution boards and control panels.
With a rated current of 3 A, a Type C tripping characteristic and a short-circuit breaking capacity of 25 kA, the S303P-C3NA is suitable for low-current three-phase circuits, automation equipment, instrumentation and industrial loads with moderate inrush currents.
Key Advantages
- Industrial-grade 3P+N miniature circuit breaker.
- 3 A rated current for low-current three-phase circuits.
- Type C tripping characteristic accommodates moderate inrush currents.
- High 25 kA short-circuit breaking capacity.
- Switched neutral provides simultaneous isolation of all conductors.
- Fail-safe terminals help prevent incorrect conductor insertion.
Key Features
- ABB System pro M compact S300P series.
- Three protected phase poles plus switched neutral.
- 3 A rated current.
- Type C tripping characteristic.
- Rated operating voltage of 415 V AC.
- 25 kA rated short-circuit breaking capacity.
- Top or bottom supply connection.
- Fail-safe cylinder-lift screw terminals.
- DIN rail mounting for modular distribution systems.
- Compatible with suitable ABB System pro M compact accessories.
Reliable Protection with Switched Neutral Isolation
The ABB S303P-C3NA uses a delayed thermal release to protect conductors against sustained overloads and an electromagnetic release to disconnect the circuit rapidly during a short circuit. Its current-limiting design helps reduce the electrical and thermal stress placed on cables and connected equipment during fault conditions.
The Type C characteristic is suitable for circuits containing equipment with moderate starting currents. Combined with switched neutral isolation, this makes the circuit breaker well suited to industrial control systems, instrumentation supplies and three-phase distribution circuits where complete conductor isolation is required.
Typical Applications
- Industrial control and automation panels.
- Instrumentation and monitoring circuits.
- Three-phase distribution boards.
- Small transformers and control equipment.
- Commercial and industrial installations.
- OEM machinery requiring neutral isolation.
