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2CDS383103R0205 ABB S303P-B20NA Miniature Circuit Breaker – 3+NP – B – 20 A
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.
£82.21
Why Choose the ABB 2CDS383103R0205 S303P-B20NA Miniature Circuit Breaker?
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.
Key Advantages
- Industrial-grade miniature circuit breaker for dependable electrical protection.
- 20 A rated current with Type B tripping characteristic.
- 3P+N configuration with three protected poles and switched neutral.
- 25 kA short-circuit breaking capacity.
- Compact DIN rail mounting for fast installation.
- Reliable overload and short-circuit protection.
Key Features
- ABB S300P System pro M compact series.
- 20 A rated operational current.
- Type B tripping characteristic.
- Three protected poles plus switched neutral.
- 25 kA rated breaking capacity.
- Suitable for AC/DC applications.
- Bidirectional supply capability.
- Contact position indication (Red ON / Green OFF).
- DIN rail mounting.
Reliable Circuit Protection for Industrial Applications
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.
Typical Applications
- Industrial distribution boards.
- Commercial electrical installations.
- Lighting distribution circuits.
- Control panels.
- Building services electrical systems.
- OEM machinery and automation equipment.
Technical Specifications
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| Current | 20 A | |
|---|---|---|
| Phase | Three Phase | |
| Device Type | MCB | |
| Trip Curve | B curve | |
| Breaking Capacity | 25 kA | |
| 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 |
Frequently Asked Questions
What is the ABB 2CDS383103R0205 used for?
It protects three-phase electrical circuits against overloads and short circuits in industrial and commercial electrical installations.
What is the rated current of the S303P-B20NA?
The ABB S303P-B20NA has a rated operational current of 20 A.
What tripping characteristic does this breaker use?
The breaker features a Type B tripping characteristic, making it ideal for lighting circuits, resistive loads and applications with low inrush currents.
What is the short-circuit breaking capacity?
The ABB S303P-B20NA provides a rated short-circuit breaking capacity of 25 kA at 415 V AC.
How is the ABB S303P-B20NA installed?
It is designed for installation on a standard DIN rail inside electrical distribution boards, switchboards and industrial control panels.
Trusted by Electrical Professionals Worldwide
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.
