ABB S303P-K0.5NA miniature circuit breaker with a 0.5 A rating, Type K tripping characteristic, 3P+N configuration and 25 kA breaking capacity for industrial electrical protection.
£249.05
The ABB 2CDS383103R0157, also known as the S303P-K0.5NA, is a premium miniature circuit breaker (MCB) designed to provide dependable protection against overloads and short circuits in industrial and commercial electrical systems. As part of the robust ABB S300P System pro M compact series, it delivers exceptional reliability, high fault-breaking performance and long service life for demanding power distribution applications.
Featuring a 3P+N configuration, the S303P-K0.5NA protects all three phase conductors while incorporating a switched neutral pole. Its Type K tripping characteristic is specifically designed for circuits with high inrush currents, making it ideal for motors, transformers, contactors and other inductive industrial loads.
With a rated current of 0.5 A, an operating voltage of up to 415 V AC and a high 25 kA breaking capacity, this miniature circuit breaker provides reliable protection for switchboards, control panels and industrial distribution systems. Its compact DIN rail mounting design enables fast installation and efficient use of panel space.
The ABB S303P-K0.5NA automatically disconnects electrical circuits whenever overload or short-circuit conditions occur, helping protect electrical equipment, cables and connected systems while improving operational safety and minimising downtime.
Its Type K tripping characteristic makes it especially suitable for inductive loads that experience high starting currents. Combined with ABB's proven S300P platform, it offers dependable performance for industrial automation, machinery and commercial electrical installations.
| Current | 0.5 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S300P System pro M compact |
| Model | S303P-K0.5NA |
| Product ID | 2CDS383103R0157 |
| Product type | Miniature circuit breaker |
| Rated current | 0.5 A |
| Tripping characteristic | Type K |
| Number of poles | 3P+N |
| Number of protected poles | 3 |
| Rated operating voltage | Up to 415 V AC |
| Voltage type | AC/DC |
| Frequency | 50 / 60 Hz |
| Breaking capacity | 25 kA |
| Rated insulation voltage | 500 V |
| Impulse withstand voltage | 6 kV |
| Protection rating | IP20 terminals / IP40 when installed in an enclosure |
| Mounting type | DIN rail mounting |
| Module width | 4 modules |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.496 kg |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It protects three-phase electrical circuits against overloads and short circuits, particularly those supplying motors, transformers and other inductive loads.
The ABB S303P-K0.5NA has a rated operational current of 0.5 A.
Type K breakers are designed to accommodate high inrush currents, making them suitable for motors, transformers and similar inductive equipment.
The S303P-K0.5NA provides a high 25 kA short-circuit breaking capacity for demanding industrial installations.
It is designed for mounting on a standard DIN rail inside electrical distribution boards, switchboards and industrial control panels.
ABB S300P miniature circuit breakers are trusted by industrial engineers, OEM machine builders and panel manufacturers to deliver reliable overload and short-circuit protection in demanding electrical installations.
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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...