2CDS273445R0635 ABB S203MT-B63 MCB 10 kA 3P Type B 63 A

Why Choose the ABB S203MT-B63 Miniature Circuit Breaker?

The ABB S203MT-B63 is a high-performance three-pole miniature circuit breaker (MCB) designed to protect electrical circuits, cables and conductors against overload and short-circuit conditions. As part of the dedicated ABB S200MT traction series, it is engineered for demanding railway and rolling-stock installations where dependable circuit protection, mechanical robustness and compliance with traction requirements are essential.

The S200MT series extends ABB's System pro M compact range with circuit breakers specifically developed for the traction industry. Dedicated housing materials support compliance with stringent railway fire and smoke requirements, while shock and vibration testing makes the range suitable for rolling-stock installations. Compatibility with System pro M compact accessories also enables flexible integration into electrical distribution and control systems.

With a rated current of 63 A, a Type B tripping characteristic and a 10 kA short-circuit breaking capacity, the S203MT-B63 provides dependable three-pole protection for circuits requiring a relatively sensitive magnetic trip response. Its robust construction and wide operating-temperature capability make it suitable for demanding traction and industrial environments.

Key Advantages

• Dedicated miniature circuit breaker for railway and traction applications.
• 63 A rated current for higher-current three-pole circuit protection.
• Type B tripping characteristic for circuits with relatively low inrush currents.
• 10 kA short-circuit breaking capacity for dependable fault protection.
• Dedicated materials designed to meet stringent railway fire and smoke requirements.
• Shock and vibration tested for demanding rolling-stock installations.

Key Features

• ABB S200MT traction miniature circuit breaker series.
• 63 A rated current.
• Three-pole (3P) configuration.
• Type B tripping characteristic.
• 10 kA short-circuit breaking capacity.
• Rated insulation voltage up to 440 V AC.
• Designed for operation in extreme conditions from -40 °C to +70 °C.
• Contact Position Indicator (CPI) clearly displays the position of the main contacts.
• Supports conductor cross-sections from 0.75 mm² to 35 mm².
• Compatible with ABB System pro M compact accessories.

Reliable Circuit Protection for Railway and Traction Systems

Miniature circuit breakers such as the ABB S203MT-B63 use thermal and magnetic tripping mechanisms to interrupt excessive current. The delayed thermal mechanism provides overload protection, while the magnetic mechanism responds rapidly to short-circuit conditions, helping protect cables, conductors and connected electrical equipment from damaging fault currents.

The S200MT range is specifically developed for traction applications and incorporates dedicated materials for railway fire and smoke requirements together with resistance to shock, vibration and extreme temperatures. These characteristics make the S203MT-B63 well suited to rolling-stock distribution systems and other installations where reliable electrical protection must be maintained under demanding environmental conditions.

Typical Applications

• Railway and rolling-stock electrical systems.
• Traction auxiliary electrical circuits.
• Train control and equipment cabinets.
• Railway distribution and protection panels.
• Circuits with relatively low starting and inrush currents.
• Industrial control panels and electrical distribution systems.
• Cable and conductor overload and short-circuit protection.