2CDS271446R0015 ABB S201MT-B1NA 1A 1P+N Type B 10kA Miniature Circuit Breaker

Why Choose the ABB S201MT-B1NA Miniature Circuit Breaker?

The ABB S201MT-B1NA is a specialised 1P+N miniature circuit breaker (MCB) designed to provide dependable overload and short-circuit protection in demanding railway and traction electrical systems. Part of the ABB S200 MT traction MCB series, it combines a protected phase pole with neutral switching in a compact modular device for rolling stock distribution and auxiliary circuits.

This miniature circuit breaker features a 1 A rated current, Type B tripping characteristic and 10 kA short-circuit breaking capacity. The B characteristic is suited to circuits with relatively low starting and inrush currents, making the S201MT-B1NA suitable for sensitive auxiliary, control, signalling and monitoring circuits requiring low-current protection.

The 1P+N configuration enables simultaneous switching of the phase and neutral conductors while providing overcurrent protection on the phase pole. Combined with the traction-focused S200 MT platform and DIN-rail mounting, this makes the S201MT-B1NA a practical circuit-protection solution for railway electrical distribution and control assemblies.

Key Advantages

• Specialised miniature circuit breaker for railway and traction applications.
• 1 A rated current for low-current circuit protection.
• 1P+N configuration provides phase protection together with neutral switching.
• Type B tripping characteristic suited to circuits with relatively low inrush currents.
• 10 kA short-circuit breaking capacity for dependable fault protection.
• Thermal and magnetic mechanisms provide overload and short-circuit protection.
• Compact modular construction supports efficient use of electrical panel space.
• DIN-rail mounting simplifies integration into traction distribution and control assemblies.

Key Features

• ABB S200 MT traction MCB series.
• 1 A rated current.
• 1P+N pole configuration.
• B tripping characteristic.
• 10 kA short-circuit breaking capacity.
• Designed for railway and traction electrical installations.
• Protected phase pole with switched neutral.
• Thermal overload protection for sustained overcurrent conditions.
• Magnetic protection for rapid interruption of severe short-circuit faults.
• Suitable for auxiliary, control, signalling and monitoring circuits.
• DIN-rail mounting for straightforward installation and servicing.

Phase and Neutral Switching for Traction Circuits

The 1P+N configuration combines an overcurrent-protected phase pole with a switched neutral pole, allowing both conductors to be disconnected together. This arrangement is particularly useful in auxiliary and control circuits where coordinated phase and neutral isolation is required while overcurrent protection is applied to the live conductor.

The Type B characteristic is intended for circuits with relatively low temporary inrush currents. During sustained overload conditions, the thermal tripping mechanism disconnects the circuit, while magnetic operation provides rapid response to severe short-circuit faults. Together with the specialised S200 MT traction design, these characteristics make the S201MT-B1NA suitable for low-current railway electrical circuits.

Typical Applications

• Railway rolling stock electrical systems.
• Train auxiliary and control circuits.
• Signalling and monitoring circuits.
• Traction electrical distribution panels.
• Rail vehicle control cabinets.
• Low-current circuits requiring phase protection and neutral switching.