2CDS273447R0517 ABB S203MTR-K25 MCB 10 kA 3P Type K 25 A

Why Choose the ABB S203MTR-K25 Miniature Circuit Breaker?

The ABB S203MTR-K25 is a specialised three-pole miniature circuit breaker (MCB) designed to protect electrical circuits against overload and short-circuit conditions in demanding railway, rolling-stock and traction applications. As part of ABB's traction circuit-protection range, it combines dependable protection with a compact modular format for transport electrical systems.

The S203MTR-K25 is intended for applications where reliable circuit protection is required within railway electrical distribution, auxiliary power and control equipment. Its three-pole configuration provides coordinated circuit protection across three conductors, making it suitable for three-phase installations and other appropriate traction electrical circuits.

With a rated current of 25 A, a Type K tripping characteristic, 3P configuration and 10 kA short-circuit breaking capacity, the S203MTR-K25 provides effective circuit protection while accommodating elevated starting and inrush currents. The Type K characteristic is particularly suited to circuits containing inductive loads such as motors and transformers.

Key Advantages

• Specialised miniature circuit breaker for railway and traction applications.
• 25 A rated current for dependable circuit protection.
• Three-pole configuration for coordinated protection across three conductors.
• Type K tripping characteristic suited to loads with elevated starting and inrush currents.
• 10 kA short-circuit breaking capacity for dependable fault protection.
• Compact modular construction for integration into electrical cabinets and distribution systems.

Key Features

• ABB S203MTR traction miniature circuit breaker.
• 25 A rated current.
• Three-pole (3P) configuration.
• Type K tripping characteristic.
• 10 kA short-circuit breaking capacity.
• Protection against overload and short-circuit conditions.
• Designed for demanding railway, rolling-stock and traction electrical installations.
• Suitable for circuits with elevated normal starting or inrush currents.
• Suitable for appropriate motor, transformer and inductive-load applications.
• Part of ABB's dedicated DC / traction MCB product group.

Reliable Circuit Protection for Railway and Traction Systems

Miniature circuit breakers such as the ABB S203MTR-K25 automatically interrupt an electrical circuit when excessive current occurs because of an overload or short circuit. This helps protect cables, conductors and connected electrical equipment against potentially damaging fault currents while allowing the breaker to be reset after the cause of the fault has been identified and corrected.

The Type K characteristic is particularly useful for circuits containing inductive equipment that can draw elevated current during normal start-up. Combined with its 25 A rating, three-pole configuration and traction-focused design, the S203MTR-K25 provides a practical protection solution for railway auxiliary, control and electrical distribution applications where increased inrush tolerance is required.

Typical Applications

• Railway and rolling-stock electrical systems.
• Traction auxiliary electrical circuits.
• Three-phase electrical circuits.
• Motor and inductive-load circuits.
• Transformer and auxiliary equipment circuits.
• Train control and equipment cabinets.
• Railway distribution and protection panels.