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2CDS383103R0557 ABB S303P-K40NA Miniature Circuit Breaker – 3+NP – K – 40 A
ABB S303P-K40NA 40A Type K miniature circuit breaker with 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£136.98
Why Choose the ABB 2CDS383103R0557 S303P-K40NA Miniature Circuit Breaker?
The ABB 2CDS383103R0557, also identified as the S303P-K40NA, is a heavy-duty miniature circuit breaker (MCB) designed to provide reliable protection against overloads and short circuits in demanding industrial electrical installations. As part of the proven ABB System pro M compact S300P series, it delivers outstanding breaking performance and dependable operation for machinery, power distribution and automation systems.
Featuring a Type K tripping characteristic, this circuit breaker is particularly suitable for protecting motors, transformers, compressors and other inductive loads with high inrush currents. The combination of thermal overload protection and rapid magnetic tripping helps minimise downtime while safeguarding valuable equipment.
With a rated current of 40 A, a 3P+N configuration and a rated operational voltage of up to 415 V AC, the S303P-K40NA is ideal for industrial control panels, switchboards and OEM machinery. Its 25 kA ultimate breaking capacity and compact DIN rail mounting make it suitable for demanding industrial applications worldwide.
Key Advantages
- Industrial miniature circuit breaker for overload and short-circuit protection.
- 40 A rated current for demanding industrial power distribution.
- 3P+N pole configuration for three-phase systems with neutral.
- Type K tripping characteristic designed for motors and inductive loads.
- 25 kA breaking capacity at 415 V AC.
- Integrated trip indication for rapid fault identification.
- Bi-directional screw terminals simplify installation.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S300P series.
- S303P-K40NA model.
- 40 A rated current.
- 415 V AC rated operational voltage.
- 3P+N pole arrangement.
- Type K tripping characteristic.
- 25 kA ultimate short-circuit breaking capacity.
- 50 / 60 Hz operation.
- 35 mm DIN rail mounting.
- Front-mounted contact and trip position indication.
Reliable Circuit Protection for Industrial Installations
The ABB S303P-K40NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect electrical infrastructure, machinery and connected equipment. Its industrial-grade construction ensures dependable long-term operation in demanding environments.
Its Type K tripping characteristic is specifically developed for circuits supplying motors and other inductive loads with high starting currents. This allows reliable start-up without nuisance tripping while maintaining rapid protection during fault conditions.
Typical Applications
- Industrial machinery.
- Motor control centres.
- Factory automation systems.
- Electrical distribution panels.
- OEM machine building.
- Compressors, pumps and fans.
- Industrial switchboards.
Technical Specifications
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| Current | 40 A | |
|---|---|---|
| Phase | Three Phase | |
| Poles | 3-pole + N | |
| Device Type | MCB | |
| Trip Curve | K curve | |
| Breaking Capacity | 25 kA | |
| Manufacturer | ABB | |
| Series | System pro M compact S300P | |
| Model | S303P-K40NA | |
| Product ID | 2CDS383103R0557 | |
| EAN | 4016779076821 | |
| Product type | Miniature circuit breaker | |
| Rated current | 40 A | |
| Number of poles | 3P+N | |
| Protected poles | 3 | |
| Neutral pole | Switched | |
| Tripping characteristic | Type K | |
| Rated operational voltage | 415 V AC | |
| Voltage type | AC/DC | |
| Rated frequency | 50 / 60 Hz | |
| Rated insulation voltage | 500 V | |
| Impulse withstand voltage | 6 kV | |
| Ultimate short-circuit breaking capacity | 25 kA at 415 V AC | |
| Service breaking capacity | 12.5 kA at 415 V AC | |
| Protection rating | IP20 (IP40 when installed in a suitable enclosure) | |
| Mounting type | 35 mm DIN rail | |
| Terminal capacity | 0.75 to 35 mm² solid, 0.75 to 25 mm² flexible | |
| Operating temperature | -40 to +70 °C | |
| Approximate dimensions (H × W × D) | 88 × 70 × 69 mm | |
| Approximate weight | 0.496 kg | |
| HS Code | 85362010 | |
| Country of Manufacture | Germany |
Frequently Asked Questions
What is the ABB 2CDS383103R0557 used for?
It protects industrial three-phase electrical circuits against overloads and short circuits, especially circuits supplying motors, transformers and other inductive equipment.
What is the rated current of this circuit breaker?
The ABB S303P-K40NA has a rated current of 40 A.
What does the Type K tripping characteristic provide?
Type K breakers are designed for inductive loads with high inrush currents, reducing nuisance tripping while maintaining reliable fault protection.
What is the short-circuit breaking capacity?
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
How is the ABB S303P-K40NA installed?
The breaker mounts directly onto a standard 35 mm DIN rail inside industrial control panels and electrical distribution boards.
Trusted Industrial Protection from ABB
ABB System pro M compact S300P miniature circuit breakers are trusted worldwide for delivering dependable overload and short-circuit protection in industrial power distribution, automation and machine building applications.
