Why Choose the ABB S303P-B50NA Miniature Circuit Breaker?
The ABB S303P-B50NA, product code 2CDS383103R0505, is a high-performance miniature circuit breaker (MCB) designed to protect industrial and commercial electrical installations against overloads and short circuits. Part of the proven ABB System pro M compact S300P series, it provides dependable circuit protection, high breaking capacity and compliance with international electrical standards.
Featuring a Type B tripping characteristic, the S303P-B50NA is suitable for circuits with relatively low inrush currents. It is particularly well suited to resistive loads, heating equipment, general power distribution and other applications where rapid magnetic fault interruption is required.
With a rated current of 50 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, this circuit breaker is suitable for three-phase systems requiring protection of all three phase conductors and simultaneous neutral switching. Its compact DIN rail design supports efficient installation in distribution boards, switchboards and industrial control panels.
Key Advantages
- Reliable overload and short-circuit protection.
- 50 A rated current for higher-capacity electrical circuits.
- Type B tripping characteristic for resistive and low-inrush loads.
- 3P+N configuration with three protected phases and switched neutral.
- High 25 kA ultimate breaking capacity at 415 V AC.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- 50 A nominal current rating.
- Type B instantaneous tripping characteristic.
- Three protected poles plus switched neutral.
- Rated operational voltage up to 415 V AC.
- Suitable for AC and DC circuit protection applications.
- Clear red ON and green OFF contact-position indication.
- DIN rail mounting for straightforward panel installation.
Dependable Protection for Low-Inrush Circuits
Miniature circuit breakers disconnect electrical circuits automatically when an overload or short circuit occurs. The ABB S303P-B50NA combines a thermal release for sustained overload protection with a magnetic release for rapid interruption of severe fault currents, helping protect cables, distribution equipment and connected loads.
Its Type B characteristic is intended for circuits that do not normally produce high starting currents. This makes the breaker suitable for resistive heating, general distribution, socket circuits and other predictable loads where fast short-circuit response is required.
Typical Applications
- Industrial and commercial distribution boards.
- Resistive heating circuits.
- General power distribution systems.
- Socket and outlet circuits.
- Control panels with low-inrush loads.
- Three-phase installations requiring neutral switching.
