ABB 2CDS381103R0557 S301P-K40NA miniature circuit breaker featuring a 40 A rating, Type K tripping characteristic, 1P+N configuration and 25 kA breaking capacity.
£114.09
The ABB 2CDS381103R0557, designated S301P-K40NA, is a high-performance miniature circuit breaker (MCB) from the ABB System pro M Compact S300P series. Designed for demanding industrial and commercial electrical installations, it provides dependable protection against overloads and short circuits whilst delivering reliable performance for circuits supplying motors, transformers and other inductive equipment.
Manufactured in accordance with international IEC, UL and CSA standards, the S301P-K40NA features ABB's patented fail-safe terminal technology, compact DIN rail mounting and clear trip indication. Its robust construction and high interruption capability make it an excellent choice for industrial control panels, machinery and power distribution systems.
Featuring a 40 A rated current, a Type K tripping characteristic, a 1P+N configuration and a 25 kA breaking capacity, the ABB 2CDS381103R0557 is particularly suited to protecting circuits with high inrush currents whilst helping to minimise nuisance tripping.
Type K miniature circuit breakers are specifically engineered for circuits supplying motors, transformers, contactors, solenoids and other inductive equipment with elevated start-up currents. Their magnetic tripping characteristic allows temporary inrush currents whilst still providing rapid protection against genuine short-circuit faults.
The ABB S301P-K40NA combines this specialist tripping characteristic with ABB's proven S300P platform, delivering excellent interruption performance, dependable long-term reliability and reduced nuisance tripping in demanding industrial environments.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M Compact S300P |
| Product ID | 2CDS381103R0557 |
| Extended product type | S301P-K40NA |
| Product type | Miniature circuit breaker (MCB) |
| EAN | 4016779079228 |
| Rated current | 40 A |
| Tripping characteristic | Type K |
| Pole configuration | 1P+N |
| Protected poles | 1 |
| Rated operating voltage | 240 V AC |
| Maximum operating voltage | 480Y / 277 V AC |
| Rated DC voltage | 72 V DC |
| Rated insulation voltage (Ui) | 500 V |
| Rated impulse withstand voltage (Uimp) | 6 kV |
| Ultimate short-circuit breaking capacity (Icu) | 25 kA |
| Rated frequency | 50 / 60 Hz |
| Protection rating | IP20 (IP40 when installed within a suitable enclosure) |
| Mounting method | DIN rail |
| Terminal type | Screw terminals |
| Dimensions (H × W × D) | Approx. 88 × 35 × 69 mm |
| Weight | Approx. 0.248 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects industrial electrical circuits against overloads and short circuits, particularly motors, transformers and other inductive equipment with high starting currents.
The ABB S301P-K40NA has a 40 A rated current.
Type K circuit breakers are designed for inductive loads with high inrush currents, allowing motor start-up currents whilst providing rapid protection against short-circuit faults.
The breaker protects the phase conductor whilst simultaneously switching the neutral conductor, providing improved circuit isolation during maintenance and fault conditions.
The ABB 2CDS381103R0557 provides an ultimate short-circuit breaking capacity of 25 kA.
Yes. It is designed for quick installation onto a standard DIN rail within industrial control panels and electrical distribution boards.
ABB System pro M Compact miniature circuit breakers are trusted by electrical engineers, OEM manufacturers and panel builders worldwide for their dependable operation, high interruption capacity and long service life in demanding industrial 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...