ABB S303P-B20NA miniature circuit breaker with a 20 A rating, Type B tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£149.48
The ABB 2CDS383103R0205, also known as the S303P-B20NA, is a premium miniature circuit breaker (MCB) engineered to provide dependable protection against overloads and short circuits in industrial and commercial electrical installations. Part of the trusted ABB S300P System pro M compact range, it combines exceptional fault-breaking performance with a compact design, making it ideal for demanding power distribution systems.
Featuring a 3P+N configuration, the S303P-B20NA protects all three phase conductors while incorporating a switched neutral pole. Its Type B tripping characteristic is designed for circuits with low inrush currents, making it particularly suitable for lighting installations, resistive loads, control circuits and commercial electrical distribution systems.
With a rated current of 20 A, a maximum operating voltage of 415 V AC and a 25 kA breaking capacity, the ABB S303P-B20NA delivers reliable circuit protection for switchboards, industrial control panels and commercial distribution boards. Its DIN rail mounting ensures straightforward installation while maximising panel space.
The ABB S303P-B20NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect electrical equipment, wiring and connected systems while improving operational safety and reducing costly downtime.
Its Type B tripping characteristic is particularly suitable for circuits supplying lighting, control equipment and resistive loads where rapid fault clearance is essential. Combined with ABB's proven S300P platform, it provides dependable long-term performance for industrial automation, commercial buildings and OEM machinery.
| Current | 20 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P System pro M compact |
| Model | S303P-B20NA |
| Manufacturer Part Number | 2CDS383103R0205 |
| Product Type | Miniature Circuit Breaker (MCB) |
| Rated Current | 20 A |
| Tripping Characteristic | Type B |
| Configuration | 3P+N |
| Protected Poles | 3 |
| Rated Voltage | Up to 415 V AC |
| Voltage Type | AC/DC |
| Maximum Operating Voltage | 480Y/277 V AC, 125 V DC (UL/CSA) |
| Frequency | 50 / 60 Hz |
| Rated Short-Circuit Breaking Capacity (Icn) | 25 kA at 415 V AC |
| Rated Insulation Voltage (Ui) | 500 V |
| Impulse Withstand Voltage (Uimp) | 6 kV |
| Protection Rating | IP20 |
| Terminal Capacity | 0.75–35 mm² rigid, 0.75–25 mm² flexible |
| Mounting | DIN Rail |
| Dimensions (H × W × D) | Approx. 88 × 70 × 69 mm |
| Weight | Approx. 0.496 kg |
| EAN | 4016779135641 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects three-phase electrical circuits against overloads and short circuits in industrial and commercial electrical installations.
The ABB S303P-B20NA has a rated operational current of 20 A.
The breaker features a Type B tripping characteristic, making it ideal for lighting circuits, resistive loads and applications with low inrush currents.
The ABB S303P-B20NA provides a rated short-circuit breaking capacity of 25 kA at 415 V AC.
It is designed for installation on a standard DIN rail inside electrical distribution boards, switchboards and industrial control panels.
ABB S300P miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers worldwide for delivering dependable overload and short-circuit protection in demanding industrial and commercial electrical installations.
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LED Controls is a specialist distributor of factory automation and industrial controls, supplying OEMs, machine builders, panel builders and end users throughout the UK and worldwide. As a trusted UK distributor for many of the world’s leading automation manufacturers, we provide industrial control products, technical expertise and bespoke automation solutions backed by outstanding customer service.
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...
2025 has been a big year for LED Controls, and our blog has expanded accordingly. We've covered a wide range of topics across industrial control and factory automation this year. From core technology explainers and new product releases to panel building best practice...