Why Choose the ABB S204MT-D40 Miniature Circuit Breaker?
The ABB S204MT-D40 is a robust four-pole miniature circuit breaker (MCB) designed for reliable overcurrent and short-circuit protection in traction, railway and industrial electrical installations. As part of the ABB System pro M compact S200MT series, it is specifically developed for demanding rolling stock applications where high breaking performance, mechanical robustness and resistance to harsh environmental conditions are required.
This circuit breaker combines a D tripping characteristic with a high 10 kA rated breaking capacity, providing dependable protection for circuits subject to higher inrush currents. The S200MT range uses dedicated materials designed to meet stringent railway fire and smoke requirements and is tested for shock and vibration conditions associated with rolling stock installations.
With a rated current of 40 A, four protected poles and an AC supply, the S204MT-D40 is suitable for distribution and equipment protection in railway vehicles and other demanding electrical systems. Its modular DIN-rail design enables straightforward installation alongside compatible ABB System pro M compact accessories.
Key Advantages
- Compact four-pole miniature circuit breaker designed for traction applications.
- 40 A rated current suitable for protected AC distribution circuits.
- D tripping characteristic for circuits with higher starting or inrush currents.
- 10 kA rated breaking capacity for effective short-circuit protection.
- Dedicated construction designed for demanding railway and rolling stock environments.
- Tested for shock and vibration requirements associated with rolling stock installations.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB System pro M compact S200MT series.
- 40 A rated current.
- D tripping characteristic.
- 4-pole configuration with four protected poles.
- 10 kA rated breaking capacity.
- AC operating supply.
- DIN-rail mounting for modular electrical distribution assemblies.
- Contact Position Indicator (CPI) for clear main-contact status indication.
- Construction designed to comply with European railway fire and smoke requirements.
- Operating temperature range from -40 °C to +70 °C.
Reliable Protection for Railway and Traction Systems
Miniature circuit breakers in the ABB S200MT range are developed specifically for electrical protection in traction and rolling stock applications. Their construction uses dedicated materials intended to meet demanding railway fire and smoke requirements, while the range has been tested against shock and vibration standards applicable to rolling stock installations.
The S204MT-D40 combines thermal and electromagnetic protection with a D characteristic suited to circuits where temporary high starting currents can occur. Its four-pole configuration provides protection across four conductors, while the high breaking capacity helps interrupt fault currents safely within the specified operating conditions.
Typical Applications
- Railway rolling stock electrical systems.
- Traction and auxiliary circuits.
- Railway vehicle distribution panels.
- Electrical equipment installed in demanding transportation environments.
- Industrial AC distribution systems requiring a D characteristic.
- Control and protection assemblies exposed to vibration and shock.
- Modular DIN-rail electrical installations.
