ABB S203-K1 three pole 1 A K curve miniature circuit breaker with 6 kA breaking capacity for industrial, commercial and OEM electrical protection.
£129.28
The ABB S203-K1 is a premium three-pole miniature circuit breaker (MCB) from the trusted ABB System pro M Compact S200 series. Designed to provide dependable overload and short circuit protection, it is ideal for industrial machinery, control systems and OEM equipment requiring reliable protection for low current, high inrush applications.
Featuring a K tripping characteristic, the S203-K1 is specifically engineered for circuits with high starting currents while maintaining a low rated current. This makes it particularly suitable for protecting motors, transformers, contactors, solenoids and other inductive loads where conventional B or C curve breakers may nuisance trip. The dual thermal and magnetic tripping mechanisms ensure dependable protection under demanding operating conditions.
With a 1 A rated current, three-pole configuration and a 6 kA short circuit breaking capacity, this DIN rail mounted miniature circuit breaker offers reliable protection, straightforward installation and compliance with IEC/EN 60898-1, IEC/EN 60947-2 and UL 1077 standards.
The ABB S203-K1 combines delayed thermal overload protection with instantaneous magnetic short circuit protection to safeguard sensitive circuits while accommodating high starting currents. This makes it particularly suitable for specialised industrial applications where low current protection and high inrush tolerance are both required.
Its K characteristic is widely used for motor control circuits, transformers, magnetic devices and other inductive equipment. The compact design enables efficient installation within switchboards, machine control panels and industrial distribution systems.
| Current | 1 A |
|---|---|
| Phase | Single Phase |
| Manufacturer | ABB |
| Series | System pro M Compact S200 |
| Model | S203-K1 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 1 A |
| Number of poles | 3 |
| Tripping characteristic | K |
| Rated operational voltage | 400 V AC |
| Maximum operational voltage | 440 V AC |
| Voltage type | AC/DC |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | 6 kA |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Failsafe bi-directional cylinder-lift screw terminals |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | approx. 0.336 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203-K1 protects three-phase electrical circuits against overloads and short circuits where low current protection and high inrush capability are required.
A K curve circuit breaker is designed for inductive loads with high starting currents, making it suitable for motors, transformers and magnetic devices.
This model features a three-pole (3P) configuration for protecting three-phase electrical systems.
The ABB S203-K1 has a rated short circuit breaking capacity of 6 kA.
The circuit breaker is designed for installation onto a standard DIN rail inside electrical distribution boards and industrial control panels.
ABB System pro M Compact miniature circuit breakers are trusted by electricians, machine builders and industrial engineers for dependable circuit protection, high quality construction and reliable long-term performance.
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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...