2CDS273061R0357 ABB S203M-K5UC MCB 10 kA 3P Type K 5 A

Why Choose the ABB S203M-K5UC Miniature Circuit Breaker?

The ABB S203M-K5UC 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 5 A rated current, Type K tripping characteristic and 10 kA short-circuit breaking capacity for demanding industrial, control, automation and DC applications.

Designed for universal-current applications, the S203M-K5UC uses thermal-magnetic operation to protect conductors and connected equipment against sustained overloads and short circuits. Its Type K characteristic is well suited to circuits containing loads with elevated starting or inrush currents, helping to avoid unwanted tripping during normal operation while maintaining dependable fault protection.

With a rated current of 5 A, three protected poles and a 10 kA short-circuit breaking capacity, the S203M-K5UC provides compact protection for multi-pole circuits. Its modular DIN-rail format supports straightforward integration into industrial control panels, distribution assemblies, automation equipment and specialist DC installations.

Key Advantages

• Versatile miniature circuit breaker for AC and DC applications.
• 5 A rated current suitable for control, auxiliary and equipment circuits.
• Three-pole configuration for simultaneous protection and switching of three conductors.
• Type K tripping characteristic suitable for loads with elevated starting and inrush currents.
• 10 kA short-circuit breaking capacity for robust fault protection.
• Thermal-magnetic protection against overload and short-circuit conditions.
• Part of the ABB System pro M compact® platform for flexible system integration.

Key Features

• ABB S200 M UC universal-current MCB series.
• 5 A rated current.
• 3-pole configuration.
• Type K tripping characteristic.
• 10 kA short-circuit breaking capacity.
• Designed for AC and DC circuit protection.
• Thermal-magnetic overload and short-circuit protection.
• Type K response suited to equipment with higher normal inrush currents.
• Compact modular construction for DIN-rail installation.
• Compatible with the ABB System pro M compact® platform.

Reliable Protection for AC and DC Circuits

Miniature circuit breakers such as the ABB S203M-K5UC 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-K5UC particularly useful for circuits containing equipment with elevated normal starting currents. Combined with the universal-current capabilities of the ABB S200 M UC series, this provides flexible protection for AC and DC control systems, automation equipment, auxiliary circuits and specialist transport installations.

Typical Applications

• Industrial AC and DC control circuits.
• Automation and machinery control panels.
• DC auxiliary and control circuits.
• Railway and transport electrical equipment.
• Equipment with elevated starting or inrush currents.
• Industrial distribution and switchgear assemblies.