Why Choose the ABB S203MT-K4 Miniature Circuit Breaker?
The ABB S203MT-K4 is a compact and robust 3-pole miniature circuit breaker (MCB) designed for reliable overload and short-circuit protection in demanding traction, railway and industrial control applications. As part of the specialist ABB S200MT miniature circuit breaker range, it provides dependable protection for electrical circuits where safety, durability and consistent operation are essential.
This miniature circuit breaker uses thermal overload protection together with an electromagnetic short-circuit trip mechanism. The K characteristic is suitable for circuits with higher inrush currents, helping reduce nuisance tripping while maintaining effective protection for cables, control equipment and auxiliary electrical systems.
With a rated current of 4 A, a 3-pole configuration and a rated short-circuit breaking capacity of 10 kA, the S203MT-K4 is well suited to low-current three-phase circuits used in control panels, signalling systems, automation equipment and transport-related installations. Its modular DIN rail design allows straightforward installation in electrical cabinets and distribution boards.
Key Advantages
- Compact 3-pole miniature circuit breaker for traction and railway applications.
- 4 A rated current for low-current circuit protection.
- K curve tripping characteristic suitable for circuits with higher inrush currents.
- 10 kA breaking capacity for dependable short-circuit protection.
- Current limiting class 3 performance helps protect downstream equipment.
- Compatible with ABB System pro M compact accessories.
Key Features
- ABB S200MT miniature circuit breaker series.
- 3-pole MCB configuration.
- 4 A rated current.
- K characteristic tripping curve.
- 10 kA rated short-circuit breaking capacity.
- Thermal and electromagnetic trip mechanisms.
- Designed for demanding traction and railway applications.
- DIN rail mounting for control panels and distribution boards.
Reliable Circuit Protection for Traction and Control Systems
Miniature circuit breakers such as the ABB S203MT-K4 protect electrical circuits by automatically disconnecting the supply during overload or short-circuit conditions. This helps reduce the risk of cable damage, equipment failure and unsafe operating conditions in critical auxiliary and control systems.
The ABB S200MT range is designed for traction and railway environments, offering robust circuit protection for rolling stock, signalling equipment and industrial control panels. Its compact construction, high breaking capacity and accessory compatibility make it a practical choice for engineers and panel builders.
Typical Applications
- Railway and traction electrical systems.
- Rolling stock control panels.
- Three-phase auxiliary circuits.
- Industrial control cabinets.
- Automation and signalling systems.
- Low-current motor control and protection circuits.
