ABB S203P-D50NA miniature circuit breaker from the System pro M compact S200P range featuring a 3+NP configuration, D curve and 50 A rated current for overload and short-circuit protection.
The ABB S203P-D50NA is a high-performance miniature circuit breaker (MCB) from the ABB System pro M compact S200P series, engineered to provide dependable overload and short-circuit protection for demanding low-voltage electrical installations. Featuring a D-curve tripping characteristic and a 50 A rated current, it is particularly suitable for circuits supplying equipment with very high inrush currents, including large motors, transformers and industrial machinery.
This ABB MCB incorporates a 3+NP pole configuration, providing protection for three phases together with a neutral pole arrangement for three-phase plus neutral distribution systems. The S200P range combines delayed thermal overload protection with electromechanical short-circuit protection to ensure reliable operation whilst limiting fault energy.
Designed for DIN rail installation, the S203P-D50NA offers excellent breaking capacity, compact dimensions and long service life, making it ideal for commercial and industrial switchboards, machinery and electrical control panels.
The ABB S203P-D50NA automatically disconnects electrical circuits during overload and short-circuit conditions. Its thermal tripping mechanism responds to sustained overloads, while the D-curve magnetic characteristic is designed to accommodate high starting currents without unnecessary tripping.
This makes the S203P-D50NA particularly suitable for industrial motors, transformers, compressors, large pumps and machinery where dependable protection and reliable operation are essential.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | System pro M compact S200P |
| Model | S203P-D50NA |
| Manufacturer part number | 2CDS283103R0501 |
| Product type | Miniature circuit breaker |
| Rated current | 50 A |
| Tripping characteristic | D curve |
| Number of poles | 3+NP |
| Number of protected poles | 3 |
| Rated operational voltage | 400 V AC |
| Rated insulation voltage | 440 V |
| Frequency | 50 / 60 Hz |
| Breaking capacity | up to 25 kA at 230 / 400 V AC |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 No. 235 |
| Mounting type | DIN rail mounting |
| Protection rating | IP20 |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| Weight | approx. 0.56 kg |
| EAN | 4016779592192 |
The ABB S203P-D50NA protects three-phase electrical circuits against overloads and short circuits where high inrush currents are present.
The S203P-D50NA has a rated current of 50 A.
A D-curve MCB is designed for circuits with very high starting currents, making it suitable for motors, transformers, compressors and other heavy inductive loads.
The breaker has a 3+NP configuration, providing protection for three phases together with a neutral pole arrangement.
The S203P-D50NA is designed for DIN rail mounting inside distribution boards, industrial switchgear and electrical control panels.
ABB System pro M compact miniature circuit breakers are trusted worldwide by electricians, panel builders and industrial engineers for dependable circuit protection, excellent fault interruption capability and long-term reliability.
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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...