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2CDS383103R0505 ABB S303P-B50NA Miniature Circuit Breaker – 3+NP – B – 50 A
ABB S303P-B50NA miniature circuit breaker with a 50 A rated current, Type B tripping characteristic, 3P+N configuration and up to 25 kA breaking capacity for industrial and commercial circuit protection.
£107.25
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.
Technical Specifications
Tick the specs you need, then view products that match.
| Current | 50 A | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 25 kA | |
| Manufacturer | ABB | |
| Series | System pro M compact S300P | |
| Model | S303P-B50NA | |
| Product ID | 2CDS383103R0505 | |
| Product type | Miniature circuit breaker | |
| Rated current | 50 A | |
| Tripping characteristic | Type B | |
| Pole configuration | 3P+N | |
| Total number of poles | 4 | |
| Number of protected poles | 3 | |
| Rated operational voltage | 240 / 415 V AC | |
| Maximum AC operating voltage | 480Y / 277 V AC | |
| Maximum DC operating voltage | 125 V DC | |
| Frequency | 50 / 60 Hz | |
| Ultimate short-circuit breaking capacity | 25 kA at 415 V AC | |
| Breaking capacity at 440 V AC | 15 kA | |
| Rated insulation voltage (Ui) | 500 V | |
| Rated impulse withstand voltage (Uimp) | 6 kV | |
| Protection rating | IP20, up to IP40 in a suitable enclosure | |
| Mounting type | DIN rail mounting | |
| Maximum solid conductor capacity | 35 mm² | |
| Maximum flexible conductor capacity | 25 mm² | |
| Dimensions (H × W × D) | approximately 88 × 70 × 69 mm | |
| Weight | approximately 0.50 kg | |
| EAN | 4016779076876 | |
| Applicable standards | IEC/EN 60947-2, IEC/EN 60898-1, UL and CSA standards where applicable | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB S303P-B50NA used for?
The ABB S303P-B50NA protects three-phase industrial and commercial circuits against overloads and short circuits, particularly circuits with resistive or low-inrush loads.
What is the rated current of the S303P-B50NA?
The S303P-B50NA has a rated current of 50 A.
What does the Type B tripping characteristic mean?
A Type B miniature circuit breaker provides rapid magnetic tripping at relatively low multiples of its rated current, making it suitable for resistive loads and circuits with minimal starting current.
What is the breaking capacity of this circuit breaker?
The S303P-B50NA has an ultimate short-circuit breaking capacity of up to 25 kA at 415 V AC and 15 kA at 440 V AC.
How is the ABB S303P-B50NA installed?
The circuit breaker mounts onto a standard DIN rail inside an electrical distribution board, switchboard or industrial control-panel enclosure.
Trusted Industrial Protection from ABB
ABB System pro M compact miniature circuit breakers are widely specified by electrical engineers, panel builders and contractors for reliable circuit protection, high fault-breaking performance and straightforward integration into modern electrical installations.
