ABB S303P-K2 three-pole miniature circuit breaker with a 2 A rated current, K curve tripping characteristic and 25 kA breaking capacity for industrial motor and inductive load protection.
£203.91
The ABB S303P-K2 is a premium three-pole miniature circuit breaker (MCB) engineered to provide reliable 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 dependable circuit protection, exceptional fault interruption capability and long service life in demanding applications.
Designed in accordance with international IEC, UL and CSA standards, the S303P-K2 features a compact DIN rail mounted design that enables fast installation inside switchboards, control panels and distribution boards. Its robust switching mechanism, secure screw terminals and high mechanical endurance make it ideal for continuous industrial operation.
Featuring a 2 A rated current, a K curve tripping characteristic and a 25 kA breaking capacity, this miniature circuit breaker is particularly suited to protecting transformers, control circuits, motors and inductive loads where higher inrush currents require a specialised tripping characteristic.
The ABB S303P-K2 automatically disconnects electrical circuits when overload or short-circuit conditions occur, protecting wiring and connected equipment from damage. The K curve characteristic is specifically designed for circuits with higher inrush currents, making it particularly suitable for motors, transformers, solenoids and other inductive loads.
As part of ABB's S300P range, the S303P-K2 combines high fault interruption capability with reliable long-term performance, making it a preferred choice for panel builders, machine manufacturers and industrial electrical contractors.
| Current | 2 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S300P |
| Model | S303P-K2 |
| SKU | 2CDS383001R0277 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 2 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 415 V AC |
| Rated insulation voltage | 500 V |
| Protection rating | IP20 |
| Mounting type | 35 mm DIN rail |
| Dimensions (H × W × D) | 88 × 52.5 × 69 mm |
| Weight | 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 other inductive loads create higher inrush currents.
The ABB S303P-K2 has a 2 A rated current.
The K curve is designed for inductive loads and motor circuits, allowing higher starting currents while still providing rapid fault protection.
The S303P-K2 offers a 25 kA rated short-circuit breaking capacity (Icn) with an ultimate breaking capacity of up to 100 kA (Icu) at 415 V AC.
The breaker is designed for mounting onto 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, machine builders and panel manufacturers for delivering dependable circuit protection, high 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...