2CDS273061R0317 ABB S203M-K3UC MCB 10 kA 3P Type K 3 A

Why Choose the ABB S203M-K3UC Miniature Circuit Breaker?

The ABB S203M-K3UC 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 3 A rated current, Type K tripping characteristic and 10 kA short-circuit breaking capacity for demanding industrial, control, automation and transport applications.

Designed for flexible AC and DC circuit protection, the S203M-K3UC uses thermal-magnetic operation to protect conductors and connected equipment against sustained overloads and short circuits. Its Type K characteristic is particularly suitable for circuits containing loads with elevated starting or inrush currents, helping reduce unwanted tripping while maintaining effective protection against electrical faults.

With a rated current of 3 A, three protected poles and a 10 kA short-circuit breaking capacity, the S203M-K3UC provides compact protection for multi-pole electrical circuits. Its modular DIN-rail construction enables straightforward integration into control panels, distribution assemblies, industrial machinery and specialist DC installations.

Key Advantages

• Versatile miniature circuit breaker for AC and DC applications.
• 3 A rated current suitable for control and auxiliary 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.
• 3 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 for 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-K3UC 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 sufficiently high fault currents occur.

The Type K characteristic makes the S203M-K3UC particularly useful for electrical circuits containing equipment with higher 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 circuits.
• Railway and transport electrical equipment.
• Control equipment with elevated starting or inrush currents.
• Industrial distribution and switchgear assemblies.