ABB S203P-K63NA System pro M compact S200P miniature circuit breaker, a 4 pole 63 A K curve MCB designed for industrial and commercial circuit protection.
The ABB S203P-K63NA is a high performance 4 pole miniature circuit breaker (MCB) from the ABB System pro M compact S200P series. Designed for reliable circuit protection in demanding commercial and industrial installations, it provides dependable overload and short circuit protection for three-phase circuits with neutral switching.
Featuring a K tripping characteristic, the S203P-K63NA is suitable for circuits with higher inrush currents, including motors, transformers and inductive loads. Its current limiting design helps reduce fault energy during short circuit conditions, supporting safer and more reliable electrical distribution.
With a 63 A rated current, 3P+N configuration and compact DIN rail mounted construction, this ABB miniature circuit breaker is ideal for industrial control panels, switchboards and power distribution systems requiring robust protection and long service life.
Miniature circuit breakers such as the ABB S203P-K63NA protect electrical installations by disconnecting circuits during overload or short circuit conditions. The delayed thermal mechanism responds to overloads, while the electromechanical magnetic mechanism provides rapid tripping during short circuit faults.
The K curve characteristic is particularly useful where connected equipment may create elevated inrush currents during start-up. This makes the S203P-K63NA a strong choice for machinery, transformers, motor circuits and other industrial loads where dependable protection and operational continuity are essential.
| Current | 63 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-K63NA |
| Product ID | 2CDS283103R0607 |
| EAN | 4016779593403 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 63 A |
| Poles | 4 pole / 3P+N |
| Protected poles | 3 |
| Trip characteristic | K Curve |
| Rated voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | Up to 25 kA |
| Current limiting class | 3 |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Terminal type | Screw terminals |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL1077, CSA 22.2 No. 235 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.56 kg |
The ABB S203P-K63NA is used to protect electrical circuits against overloads and short circuits in industrial, commercial and control panel applications.
A K curve MCB is designed for circuits with higher inrush currents, making it suitable for motors, transformers and inductive loads.
The S203P-K63NA has a 4 pole / 3P+N configuration, with three protected poles and a switched neutral.
The ABB S203P-K63NA has a rated current of 63 A.
Yes. The S203P-K63NA is designed for installation on standard DIN rails in distribution boards, switchboards and industrial control panels.
ABB System pro M compact miniature circuit breakers are trusted by electrical engineers, panel builders and OEM manufacturers for reliable circuit protection, compact installation and dependable performance in demanding electrical systems.
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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...