ABB S203-K16NA miniature circuit breaker with 16 A rating, K trip characteristic and 3 protected poles plus neutral for industrial and commercial circuit protection.
£167.11
The ABB S203-K16NA is a premium 3-pole + neutral miniature circuit breaker (MCB) from the industry-leading ABB System pro M compact S200 series. Designed to provide dependable overload and short circuit protection, it is ideally suited to industrial machinery, commercial switchboards, control panels and electrical distribution systems where reliable circuit protection is essential.
Featuring a K trip characteristic, the S203-K16NA is specifically engineered for circuits with moderate inrush currents, making it an excellent choice for motors, transformers, contactors and other inductive loads. Its current limiting construction helps minimise fault energy, protecting valuable equipment while improving overall system reliability.
With a 16 A rated current, 3 protected poles plus neutral and a compact DIN rail mounted design, the ABB S203-K16NA provides fast installation and seamless compatibility with ABB auxiliary contacts, shunt trips, undervoltage releases and other System pro M compact accessories.
The ABB S203-K16NA combines thermal overload protection with instantaneous magnetic short circuit protection to safeguard electrical installations against overloads and fault currents. Its current limiting design helps reduce the energy released during fault conditions, protecting downstream equipment and extending service life.
As part of ABB's proven System pro M compact range, the S203-K16NA delivers dependable performance, straightforward installation and long-term reliability across industrial, commercial and OEM electrical applications.
| Current | 16 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200 |
| Model | S203-K16NA |
| Product type | Miniature circuit breaker |
| Rated current | 16 A |
| Tripping characteristic | K |
| Poles | 3 protected poles + neutral |
| Rated operational voltage | Up to 440 V AC |
| Maximum operating voltage (UL) | 480Y/277 V AC |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | 6 kA |
| Energy limiting class | 3 |
| Mounting type | DIN rail |
| Terminal type | Failsafe bi-directional screw terminals |
| Protection rating | IP20 (IP40 when installed in an enclosure) |
| Dimensions (H × W × D) | 88 × 70 × 69 mm |
| Weight | Approx. 0.45 kg |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203-K16NA provides overload and short circuit protection for industrial, commercial and OEM electrical circuits.
The K characteristic is designed for circuits with moderate inrush currents, making it suitable for motors, transformers and other inductive loads.
The S203-K16NA features 3 protected poles plus a neutral pole for use on three-phase electrical systems with a neutral conductor.
Yes. The ABB S203-K16NA is designed for installation on standard 35 mm DIN rails.
Yes. It supports ABB auxiliary contacts, shunt trips, undervoltage releases and other compatible System pro M compact accessories.
ABB System pro M compact miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers for dependable circuit protection, high quality construction 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...