ABB S203UP-K3 Circuit Breaker, 3A, 3-Pole, 277V

The ABB S203UP-K3 Circuit Breaker is a compact, dependable three-pole protection device designed for demanding industrial electrical service, maintenance, and replacement projects. With a 3 A rating and 277 V nominal operation, it safeguards three-phase circuits with a single, streamlined solution.

Why this 3-pole breaker stands out

• Three-pole design for three-phase systems – Protects all three phases in one compact unit, simplifying panel layouts and ensuring synchronized protection across the circuit.
• 277 V suitability – Optimized for industrial environments and equipment that run on 277 V, helping maintain safe, reliable operation in typical commercial/industrial power networks.
• Precise 3 A protection – Provides targeted overcurrent protection for low-current devices or circuits, reducing nuisance trips while maintaining safety margins.
• Reliable ABB compatibility – Use the exact part number S203UP-K3 to confirm fit and compatibility with your application and ABB systems.
• Designed for maintenance and replacement work – A practical choice when upgrading or refreshing aging infrastructure in control panels, distribution boards, or machinery feed circuits.

Ideal use cases

• Three-phase motor drives, conveyors, or pumps in manufacturing environments
• Panelboard protection for industrial facilities, HVAC systems, and processing lines
• Replacement for aging circuit protection where a single device must cover all three phases

How it compares to alternatives

Compared with single-pole solutions, the S203UP-K3 consolidates three-phase protection into one device, reducing wiring complexity and alignment issues between phases. Its 277 V rating aligns with common industrial distribution practices, offering a straightforward path to reliable protection without over-engineering the panel.

Practical guidance and maintenance

• Always verify fit by part number and application requirements to ensure compatibility with your equipment and panel design.
• When selecting replacements, confirm that the service conditions and voltage ratings match your installation to maintain safety and performance.
• If you’re unsure about compatibility, you can reach out for assistance with part numbers and application matching—we’re ready to help confirm suitability.

Protect your three-phase circuits with a purpose-built, industry-ready solution. The ABB S203UP-K3 delivers precise protection, straightforward integration, and dependable performance for demanding industrial environments.