2CDS271446R0021 ABB S201MT-D2NA 2A 1P+N Type D 10kA Miniature Circuit Breaker

Why Choose the ABB S201MT-D2NA Miniature Circuit Breaker?

The ABB S201MT-D2NA 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 suitable for rolling stock distribution, auxiliary and control circuits.

This miniature circuit breaker features a 2 A rated current, Type D tripping characteristic and 10 kA short-circuit breaking capacity. The D characteristic is suited to circuits with high temporary starting or inrush currents, making the S201MT-D2NA suitable for compatible transformers, power supplies, coils and other loads where significant current peaks can occur during normal energisation.

The 1P+N configuration provides overcurrent protection on the phase conductor together with switching of the neutral conductor. Combined with the traction-focused S200 MT platform and DIN-rail mounting, the S201MT-D2NA provides a practical protection solution for low-current railway circuits requiring both high-inrush tolerance and coordinated phase-neutral disconnection.

Key Advantages

• Specialised miniature circuit breaker for railway and traction applications.
• 2 A rated current for low-current circuit protection.
• 1P+N configuration combines phase protection with neutral switching.
• Type D tripping characteristic suited to circuits with high starting and inrush currents.
• 10 kA short-circuit breaking capacity for dependable fault protection.
• Helps reduce unwanted magnetic tripping during permissible high-inrush events.
• Thermal and magnetic mechanisms provide overload and short-circuit protection.
• DIN-rail mounting supports straightforward integration into traction distribution and control assemblies.

Key Features

• ABB S200 MT traction MCB series.
• 2 A rated current.
• 1P+N pole configuration.
• D tripping characteristic.
• 10 kA short-circuit breaking capacity.
• Designed for railway and traction electrical installations.
• Protected phase pole with switched neutral.
• Suitable for compatible circuits with substantial temporary inrush currents.
• Thermal overload protection for sustained overcurrent conditions.
• Magnetic protection for rapid interruption of severe short-circuit faults.
• Modular DIN-rail construction for convenient installation and servicing.

Type D Phase and Neutral Protection for High-Inrush Circuits

The Type D characteristic is intended for circuits where connected equipment can draw substantial temporary current during normal start-up or energisation. This makes the ABB S201MT-D2NA suitable for compatible transformers, power supplies, coils and other high-inrush loads where greater tolerance of normal current peaks can help prevent unnecessary magnetic tripping.

Its 1P+N arrangement combines an overcurrent-protected phase pole with neutral switching, allowing both conductors to be disconnected together. During sustained overload conditions the thermal mechanism operates the breaker, while the magnetic mechanism responds rapidly to severe short-circuit faults, providing coordinated protection for compatible railway and traction circuits.

Typical Applications

• Railway rolling stock electrical systems.
• Train auxiliary and control circuits.
• Transformer and power-supply circuits.
• Coil and other compatible high-inrush loads.
• Traction electrical distribution panels.
• Low-current circuits requiring phase protection and neutral switching.