ABB S203MT-C50NA miniature circuit breaker, a 50 A 3-pole plus neutral C curve MCB from the ABB S200MT range for overload and short-circuit protection in low-voltage electrical installations.
£217.67
The ABB S203MT-C50NA is a compact and dependable miniature circuit breaker (MCB) designed to provide overload and short-circuit protection in low-voltage electrical installations. As part of the ABB S200MT miniature circuit breaker range, it is developed for demanding industrial, traction and railway applications where reliable circuit protection, compact installation and long service life are essential.
This circuit breaker features a C curve tripping characteristic, making it suitable for general-purpose circuits with moderate inrush currents. Its current limiting design helps reduce fault energy, supporting safer operation and improved protection for cables, switchgear and connected electrical equipment.
With a rated current of 50 A and a 3-pole plus neutral configuration, the ABB S203MT-C50NA is ideal for three-phase systems where the neutral conductor must switch together with the protected phases. Its DIN rail mounting format allows quick and secure installation inside distribution boards, control panels, switchgear cabinets and railway electrical assemblies.
Miniature circuit breakers such as the ABB S203MT-C50NA protect electrical circuits by automatically disconnecting the supply when overload or short-circuit faults occur. This helps prevent cable damage, equipment failure and unsafe fault conditions in control and distribution systems.
The C curve characteristic provides a balanced tripping response for circuits with moderate inrush currents, making the S203MT-C50NA suitable for a wide range of commercial, industrial and railway electrical applications. Its 3-pole plus neutral layout supports installations where the neutral conductor must switch with the protected phases.
| Current | 50 A |
|---|---|
| Phase | Three Phase |
| Manufacturer | ABB |
| Series | S200MT |
| Model | S203MT-C50NA |
| Order code | 2CDS273106R0504 |
| Product type | Miniature circuit breaker |
| Rated current | 50 A |
| Number of poles | 3 protected poles + neutral |
| Total pole configuration | 4 pole |
| Tripping characteristic | C curve |
| Rated voltage | 440 V AC |
| Rated insulation voltage | 440 V |
| Rated impulse withstand voltage | 4 kV |
| Rated frequency | 50 / 60 Hz |
| Breaking capacity | 10 kA |
| Standards | IEC/EN 60898-1, IEC/EN 60947-2 |
| Protection rating | IP20 |
| Mounting type | DIN rail mounting |
| Built-in depth | approx. 69 mm |
| Dimensions (H × W × D) | approx. 88 × 70 × 69 mm |
| HS Code | 85362010 |
| Country of Manufacture | Germany |
The ABB S203MT-C50NA is used to protect low-voltage electrical circuits against overloads and short circuits, particularly in distribution boards, control panels, railway systems and industrial installations.
This miniature circuit breaker has a rated current of approximately 50 A.
It means the device has three protected poles for phase conductors and an additional neutral pole that switches with the circuit.
The C curve is designed for general-purpose circuits with moderate inrush currents, providing reliable overload and short-circuit protection for many commercial and industrial applications.
The ABB S203MT-C50NA is typically installed on DIN rail inside electrical control panels, distribution boards, switchgear cabinets and railway electrical assemblies.
ABB S200MT miniature circuit breakers are widely used by panel builders, railway system engineers and electrical installers to deliver dependable circuit protection in demanding low-voltage applications.
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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...