ABB S203P-D0.5NA System pro M compact S200P miniature circuit breaker, a 3P+N 0.5 A D curve MCB designed for low-current industrial and commercial circuit protection.
The ABB S203P-D0.5NA is a high performance 3P+N miniature circuit breaker (MCB) from the ABB System pro M compact S200P series. Designed for reliable overload and short circuit protection, it provides dependable protection for three-phase circuits with neutral switching in commercial and industrial electrical installations.
Featuring a D tripping characteristic, the S203P-D0.5NA is suitable for selected circuits with high inrush currents, including transformer primaries, power supplies, control circuits and specialist automation equipment. Its current limiting construction helps reduce fault energy during short circuit conditions, supporting safer and more reliable electrical distribution.
With a 0.5 A rated current, 3P+N configuration and DIN rail mounted construction, this ABB miniature circuit breaker is ideal for low-current industrial circuits, control panels and specialist protection applications requiring precise, compact and dependable circuit protection.
Miniature circuit breakers such as the ABB S203P-D0.5NA 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 D curve characteristic is designed for circuits with higher start-up currents, allowing short duration inrush without nuisance tripping while still providing dependable protection under fault conditions. This makes the S203P-D0.5NA suitable for selected control circuits, transformer circuits, power supplies and specialist industrial loads.
| Current | 0.5 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-D0.5NA |
| Product ID | 2CDS283103R0981 |
| EAN | 4016779592048 |
| Product type | Miniature Circuit Breaker (MCB) |
| Rated current | 0.5 A |
| Poles | 3P+N |
| Protected poles | 3 |
| Trip characteristic | D Curve |
| Rated voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| 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-D0.5NA is used to protect low-current three-phase electrical circuits against overloads and short circuits in commercial, industrial and control panel applications.
A D curve MCB is designed for circuits with high inrush currents, making it suitable for transformers, power supplies and selected industrial loads.
The S203P-D0.5NA has a 3P+N configuration, with three protected poles and a switched neutral.
The ABB S203P-D0.5NA has a rated current of 0.5 A.
Yes. The S203P-D0.5NA 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 dependable circuit protection, compact installation and reliable 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...