2CDS273061R0577 ABB S203M-K50UC MCB 10 kA 3P Type K 50 A

Why Choose the ABB S203M-K50UC Miniature Circuit Breaker?

The ABB S203M-K50UC is a high-performance three-pole universal-current miniature circuit breaker (MCB) designed for reliable overload and short-circuit protection in AC and DC electrical systems. As part of the ABB System pro M compact® S200 M UC series, it combines a 50 A rated current, Type K tripping characteristic and 10 kA short-circuit breaking capacity for demanding industrial, distribution, machinery and DC applications.

Designed for universal-current applications, the S203M-K50UC uses thermal-magnetic operation to protect conductors and connected equipment against sustained overloads and short circuits. Its Type K characteristic is particularly suited to circuits containing loads with elevated starting or inrush currents, helping to reduce unwanted tripping during normal operation while maintaining dependable fault protection.

With a rated current of 50 A, three poles and a 10 kA short-circuit breaking capacity, the S203M-K50UC provides robust protection for higher-current multi-pole circuits. Its three-pole construction is 52.5 mm wide, while ABB specifies a 10 kA Icu and 10 kA Ics breaking capacity at 440 V DC, supporting demanding DC installations.

Key Advantages

• Versatile miniature circuit breaker for AC and DC applications.
• 50 A rated current for higher-current industrial and equipment circuits.
• Three-pole configuration for multi-pole circuit protection.
• Type K tripping characteristic suited to loads with elevated starting and inrush currents.
• 10 kA short-circuit breaking capacity for robust fault protection.
• ABB-specified 10 kA Icu / 10 kA Ics at 440 V DC.
• Part of the ABB System pro M compact® platform for flexible system integration.

Key Features

• ABB S200 M UC universal-current MCB series.
• 50 A rated current.
• 3-pole configuration.
• Type K tripping characteristic.
• 10 kA short-circuit breaking capacity.
• 10 kA Icu and 10 kA Ics at 440 V DC.
• Thermal-magnetic overload and short-circuit protection.
• Type K response suited to equipment with higher normal starting currents.
• 52.5 mm three-pole width.
• Compact modular construction for DIN-rail installation.
• Part of the ABB System pro M compact® circuit protection platform.

Reliable Protection for AC and DC Circuits

Miniature circuit breakers such as the ABB S203M-K50UC protect electrical conductors and connected equipment against excessive current caused by overloads and short circuits. The thermal release responds to sustained overload conditions, while the magnetic release provides rapid interruption when fault current reaches the breaker's instantaneous tripping threshold.

The Type K characteristic makes the S203M-K50UC particularly useful for circuits containing equipment with elevated normal starting currents. Combined with the universal-current design of the ABB S200 M UC series and its high DC breaking performance, this provides flexible protection for industrial AC and DC distribution, machinery, auxiliary systems and specialist transport electrical installations.

Typical Applications

• Industrial AC and DC distribution systems.
• Machinery and equipment with elevated starting currents.
• Automation and industrial control panels.
• DC auxiliary and power distribution circuits.
• Railway and transport electrical equipment.
• Industrial switchgear and distribution assemblies.