ABB S203MT-K50NA 3P+N 50 A K curve miniature circuit breaker with 10 kA breaking capacity for railway, traction, industrial and commercial electrical protection.
£345.62
The ABB S203MT-K50NA is a robust 3P+N miniature circuit breaker (MCB) designed for railway, traction, rolling stock and demanding industrial electrical installations. Part of the specialist ABB S200MT miniature circuit breaker range, it provides dependable protection against overloads and short circuits in critical low voltage circuits.
Featuring a K tripping characteristic, the S203MT-K50NA is well suited to circuits with higher inrush currents, including motors, transformers and inductive loads. Its current limiting design helps reduce fault energy, protecting cables, components and connected equipment during short circuit conditions.
With a rated current of 50 A, a 3P+N configuration and a 10 kA breaking capacity, this ABB MCB is ideal for three-phase systems with neutral switching. It is DIN rail mounted and compatible with ABB System pro M Compact accessories for flexible installation in control panels and distribution boards.
The ABB S203MT-K50NA uses both delayed thermal tripping for overload protection and electromechanical magnetic tripping for short circuit protection. This combination supports dependable circuit performance while helping reduce the risk of damage during fault conditions.
The S200MT range is designed especially for traction and railway applications, with robust construction and compatibility with ABB System pro M Compact accessories. This makes the S203MT-K50NA suitable for use in control cabinets, rolling stock panels, distribution systems and industrial automation equipment.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-K50NA |
| Product ID | 2CDS273446R0577 |
| EAN | 4016779126984 |
| Product type | Miniature circuit breaker (MCB) |
| Rated current | 50 A |
| Tripping characteristic | K |
| Number of poles | 3P+N |
| Protected poles | 3 |
| Breaking capacity | 10 kA |
| Rated operational voltage | Up to 440 V AC |
| Frequency | 50 / 60 Hz |
| Protection rating | IP20 |
| Mounting type | DIN rail |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2, UL 1077, CSA 22.2 |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
It is used to protect three-phase electrical circuits with neutral switching against overloads and short circuits in railway, traction, industrial and commercial installations.
The K characteristic is designed for circuits with higher inrush currents, making it suitable for motors, transformers and other inductive loads.
The ABB S203MT-K50NA has a rated current of 50 A.
This model has a 3P+N configuration, meaning three protected poles plus a neutral pole.
The circuit breaker is designed for DIN rail mounting inside electrical control panels, distribution boards and switchgear assemblies.
ABB S200MT miniature circuit breakers are trusted by railway engineers, panel builders and industrial electrical professionals for dependable protection, compact installation and compliance with recognised international standards.
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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...