ABB S303P-K40NA 40A Type K miniature circuit breaker with 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£249.05
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.
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.
| Current | 40 A |
|---|---|
| Phase | Three Phase |
| 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 |
It protects industrial three-phase electrical circuits against overloads and short circuits, especially circuits supplying motors, transformers and other inductive equipment.
The ABB S303P-K40NA has a rated current of 40 A.
Type K breakers are designed for inductive loads with high inrush currents, reducing nuisance tripping while maintaining reliable fault protection.
The breaker provides a rated ultimate short-circuit breaking capacity of 25 kA at 415 V AC.
The breaker mounts directly onto a standard 35 mm DIN rail inside industrial control panels and electrical distribution boards.
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.
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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...