ABB S203-K40NA miniature circuit breaker with 40 A rated current, K trip characteristic and 3 protected poles plus neutral for industrial and commercial circuit protection.
£217.43
The ABB S203-K40NA is a robust 3-pole + neutral miniature circuit breaker (MCB) from the trusted ABB System pro M compact S200 series. Designed for overload and short circuit protection, it is suitable for industrial control panels, commercial distribution boards, OEM machinery and electrical systems requiring dependable circuit protection.
Featuring a K trip characteristic, the S203-K40NA is well suited to circuits with moderate inrush currents, including motors, transformers, contactors, solenoids and other inductive loads. Its current limiting construction helps reduce fault energy, improving protection for connected equipment and supporting long-term system reliability.
With a 40 A rated current, 3 protected poles plus neutral and a compact DIN rail mounted format, the ABB S203-K40NA offers straightforward installation, thermal magnetic protection and compatibility with ABB System pro M compact accessories including auxiliary contacts, shunt trips and undervoltage releases.
The ABB S203-K40NA uses thermal magnetic trip technology to protect circuits against overloads and short circuits. The delayed thermal trip responds to sustained overload conditions, while the electromechanical magnetic trip reacts rapidly to short circuit fault currents.
The K curve makes this miniature circuit breaker a strong choice for applications with moderate inrush currents. As part of ABB's System pro M compact range, it provides dependable current limiting performance, robust construction and long service life in demanding electrical installations.
| Current | 40 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200 |
| Model | S203-K40NA |
| Product ID | 2CDS253103R0557 |
| EAN | 4016779532754 |
| Product type | Miniature circuit breaker / supplementary protector |
| Rated current | 40 A |
| Tripping characteristic | K |
| Poles | 3 protected poles + neutral |
| Rated operational voltage | Up to 480Y/277 V AC |
| Rated insulation voltage | 440 V |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | Up to 6 kA |
| Current limiting class | 3 |
| Protection | Thermal magnetic |
| Mounting type | DIN rail |
| Terminal type | Finger-safe terminals |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203-K40NA is used to provide overload and short circuit protection for industrial, commercial and OEM electrical circuits.
The K characteristic is suitable for circuits with moderate inrush currents, including motors, transformers, solenoids and other inductive loads.
The S203-K40NA features 3 protected poles plus a neutral pole, making it suitable for three-phase systems with neutral.
The ABB S203-K40NA has a 40 A rated current.
Yes. The ABB S203-K40NA is designed for secure installation on standard DIN rails used in control panels and distribution boards.
ABB System pro M compact miniature circuit breakers are trusted by panel builders, electrical contractors and OEM manufacturers for reliable circuit protection, current limiting performance and long service life.
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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...