ABB S303P-K3 three-pole miniature circuit breaker with a 3 A rated current, K curve tripping characteristic and 25 kA breaking capacity for industrial motor and inductive load protection.
£203.91
The ABB S303P-K3 is a premium three-pole miniature circuit breaker (MCB) engineered to provide dependable protection against overloads and short circuits in industrial, commercial and OEM electrical installations. As part of the proven ABB System pro M compact S300P series, it delivers exceptional fault interruption capability, reliable operation and long service life in demanding applications.
Manufactured in accordance with international IEC, UL and CSA standards, the S303P-K3 features a compact DIN rail mounted design for fast installation within switchboards, distribution boards and industrial control panels. Integrated trip indication, fail-safe terminals and compatibility with ABB System pro M accessories make installation and maintenance simple and efficient.
Featuring a 3 A rated current, a K curve tripping characteristic and a 25 kA breaking capacity, this miniature circuit breaker is ideally suited to protecting motors, transformers, solenoids and other inductive loads that experience high inrush currents during start-up.
The ABB S303P-K3 automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping to protect wiring and connected equipment from electrical damage. Its K curve characteristic permits higher temporary starting currents while maintaining fast fault protection, making it particularly suitable for motor circuits and inductive equipment.
The ABB S300P range is trusted worldwide by panel builders, machine manufacturers and electrical contractors thanks to its outstanding reliability, high fault interruption capability and compliance with international electrical standards.
| Current | 3 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K3 |
| SKU | 2CDS383001R0317 |
| EAN | 4016779077903 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 3 A |
| Tripping characteristic | K Curve |
| Number of poles | 3 |
| Rated operational voltage | 415 V AC |
| Maximum operating voltage | 480Y/277 V AC, 125 V DC |
| Frequency | 50 / 60 Hz |
| Breaking capacity (Icn) | 25 kA |
| Ultimate breaking capacity (Icu) | 100 kA at 400/415 V AC |
| Rated insulation voltage | 500 V |
| Impulse withstand voltage | 6 kV |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | Approx. 372 g |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects three-phase electrical circuits against overloads and short circuits, particularly where motors, transformers and inductive loads generate high inrush currents.
The ABB S303P-K3 has a 3 A rated current.
The K curve is designed for inductive loads and motor circuits, allowing higher starting currents without unnecessary tripping while still providing rapid fault protection.
The S303P-K3 provides a 25 kA rated short-circuit breaking capacity (Icn) and an ultimate breaking capacity of up to 100 kA (Icu) under IEC 60947-2.
The breaker is designed for installation on a standard 35 mm DIN rail inside electrical distribution boards, switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted worldwide by electricians, panel builders and machine manufacturers for delivering dependable circuit protection, excellent fault performance and long operational 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...