Why Choose the ABB S203MT-C50NA Miniature Circuit Breaker?
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.
Key Advantages
- Compact miniature circuit breaker for circuit protection.
- 50 A rated current for low-voltage electrical circuits.
- 3-pole plus neutral configuration for three-phase systems with switched neutral.
- C curve tripping characteristic for general-purpose circuit protection.
- 10 kA breaking capacity for dependable short-circuit protection.
- DIN rail mounting for fast installation in electrical enclosures.
Key Features
- ABB S200MT miniature circuit breaker series.
- 50 A nominal current rating.
- 3 protected poles plus neutral.
- C type tripping curve for circuits with moderate inrush current.
- Thermal tripping mechanism for overload protection.
- Electromechanical tripping mechanism for short-circuit protection.
- Current limiting performance to reduce fault energy.
- Compatible with ABB System pro M compact accessories.
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.
Typical Applications
- Industrial control panels and automation systems.
- Railway and traction electrical installations.
- Three-phase circuits requiring switched neutral protection.
- Distribution boards and switchgear assemblies.
- General-purpose electrical circuits with moderate inrush currents.
- Commercial and industrial low-voltage installations.
