Why Choose the ABB S303P-B40NA Miniature Circuit Breaker?
The ABB S303P-B40NA, product code 2CDS383103R0405, is a premium miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in industrial and commercial electrical installations. As part of the trusted ABB System pro M compact S300P series, it delivers outstanding protection performance, high breaking capacity and dependable long-term operation for demanding electrical systems.
Featuring a Type B tripping characteristic, the S303P-B40NA is ideally suited to circuits with low inrush currents, including lighting installations, socket outlet circuits, resistive loads and sensitive electrical equipment. Its combined thermal and magnetic trip mechanisms provide fast fault detection while helping protect wiring, equipment and personnel from electrical faults.
With a rated current of 40 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, this miniature circuit breaker is ideal for three-phase electrical distribution systems requiring simultaneous neutral switching. Its compact DIN rail mounting design allows straightforward installation in distribution boards, switchgear and industrial control panels.
Key Advantages
- Reliable overload and short-circuit protection.
- 40 A rated current for industrial and commercial distribution circuits.
- Type B tripping characteristic for low inrush current applications.
- 3P+N configuration with switched neutral.
- 25 kA breaking capacity for demanding industrial installations.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- 40 A nominal current rating.
- Type B tripping characteristic.
- Three protected poles plus switched neutral.
- Rated operational voltage up to 415 V AC.
- 25 kA IEC 60947-2 breaking capacity.
- Suitable for AC and DC applications.
- DIN rail mounting with integrated trip indication.
Reliable Protection for Electrical Distribution Systems
Miniature circuit breakers automatically disconnect electrical circuits when overloads or short circuits occur. The ABB S303P-B40NA combines thermal overload protection with rapid magnetic fault interruption to help safeguard electrical installations, cables and connected equipment from excessive current and fault conditions.
Its Type B characteristic is designed for circuits with relatively low inrush currents, making it particularly suitable for lighting systems, commercial electrical installations and general-purpose power distribution. The high short-circuit breaking capacity provides dependable protection even in demanding industrial environments.
Typical Applications
- Industrial distribution boards.
- Commercial electrical installations.
- Lighting circuits.
- Socket outlet circuits.
- Control panels and switchboards.
- General-purpose three-phase electrical distribution.
