Why Choose the ABB S303P-B6NA Miniature Circuit Breaker?
The ABB S303P-B6NA (2CDS383103R0065) is a premium three-phase plus switched neutral (3P+N) miniature circuit breaker (MCB) engineered to provide reliable protection against overloads and short circuits in commercial and industrial electrical installations. As part of the proven ABB S300P series, it delivers high fault-breaking performance and dependable operation for distribution boards, switchgear, control panels and OEM machinery.
The S303P-B6NA features three protected phase poles and one switched neutral pole, enabling simultaneous isolation of all conductors while providing thermal and magnetic protection to the phase conductors. Its compact DIN rail design, fail-safe cylinder-lift screw terminals and top or bottom supply connections simplify installation and maintenance.
With a rated current of 6 A, a Type B tripping characteristic and a rated short-circuit breaking capacity of 25 kA, the S303P-B6NA is ideal for resistive and lightly inductive loads with low inrush currents, including lighting, heating and general-purpose distribution circuits.
Key Advantages
- Industrial-grade 3P+N miniature circuit breaker.
- 6 A rated current for three-phase distribution circuits.
- Type B tripping characteristic for low inrush current applications.
- 25 kA short-circuit breaking capacity.
- Switched neutral provides simultaneous isolation of all conductors.
- Compact DIN rail mounting with fail-safe terminals.
Key Features
- ABB S300P series.
- 3 protected poles + switched neutral (3P+N).
- 6 A rated current.
- Type B tripping characteristic.
- Rated operating voltage: 415 V AC.
- Maximum operating voltage: 125 V DC.
- 25 kA rated breaking capacity (Icn).
- 100 kA ultimate breaking capacity (Icu) to IEC 60947-2.
- Rated insulation voltage: 500 V.
- Rated impulse withstand voltage: 6 kV.
Reliable Protection for Low Inrush Current Circuits
The ABB S303P-B6NA automatically disconnects electrical circuits during overload or short-circuit conditions, protecting wiring, equipment and connected loads from electrical damage while helping minimise downtime.
Its Type B tripping characteristic is optimised for circuits with low starting currents, making it particularly suitable for lighting, heating, socket outlets, instrumentation and general-purpose distribution systems requiring switched neutral isolation.
Typical Applications
- Commercial distribution boards.
- Industrial control panels.
- Lighting circuits.
- Heating systems.
- Instrumentation and monitoring equipment.
- OEM machinery with switched neutral requirements.
