ABB S203U-K25 Circuit Breaker, 25A, 3-Pole, 240V

The ABB S203U-K25 is a robust 25 A, 3-pole circuit breaker designed for industrial electrical service, maintenance, and replacement projects. Built to integrate with the S200U family, this unit delivers dependable overcurrent protection for three-phase 240 V systems, making it a trusted choice for demanding environments where uptime and safety matter.

Key specifications

• Amperage: 25 A
• Poles: 3
• Voltage: 240 V
• Series: S200U
• Part Number: S203U-K25

What makes this unit stand out

Designed for industrial service, the S203U-K25 excels in retrofit, maintenance, and replacement scenarios where a compatible, reliable protection device is essential. By aligning with the S200U series, it offers a familiar footprint and mounting approach for existing panels, simplifying upgrades and field replacements without unnecessary downtime.

Ideal use cases

• Replacing failed breakers in 3-phase 240 V distribution panels and motor control centers.
• New installations within industrial facilities that operate three-phase 240 V systems.
• Maintenance projects that require matching the original S200U-series components for seamless compatibility.

How it solves common problems

• Protects distribution circuits from overcurrent and short-circuit conditions in 3-phase 240 V networks.
• Provides a reliable, standard component for ongoing maintenance cycles and part replacement programs.
• Supports straightforward compatibility checks via the part number to ensure correct fit in existing ABB systems.

Compatibility and installation notes

Note: Verify fit by part number and application requirements. The S203U-K25 is commonly associated with the S200U series, so confirming compatibility with your specific panel or enclosure is essential before purchase. If you need help matching a part number or confirming compatibility, message us and we’ll assist you.

Practical tips for procurement and installation

• Keep the exact part number (S203U-K25) on file for future replacements to avoid ambiguity in inventory.
• Document your panel model and confirm that the footprint and mounting configuration align with the S200U family before ordering.
• Plan for standard installation practices in industrial environments, including proper de-energization, safety procedures, and adherence to local electrical codes.