ABB S203U-K15 15A 3-Pole 240 V Circuit Breaker

ABB S203U-K15 15A 3-Pole 240 V Circuit Breaker

Protect your three‑phase electrical system with precision and reliability using the ABB S203U-K15. This 15‑amp circuit breaker is engineered to guard wiring and equipment in 3‑pole, 240 V electrical panels, delivering dependable overcurrent protection when it matters most. Built around ABB’s trusted engineering, it pairs straightforward performance with robust, real‑world durability.

• Current rating: 15 A
• Poles: 3
• Voltage rating: 240 V
• Part number: S203U-K15

Why a three-pole design matters

In three‑phase systems, protecting all three conductors simultaneously reduces the risk of unbalanced faults that can damage motors, transformers, or drives. The S203U-K15 provides synchronized protection across all phases, helping prevent nuisance trips and minimizing downtime caused by phase-related faults.

Ideal use scenarios

• Three‑phase motor circuits in light industrial or commercial equipment
• HAC and compressor panels where reliable, consistent protection across all phases is essential
• Distribution panels operating at 240 V that require a compact, dependable trip device

What makes it valuable

Beyond simple cut‑offs, the S203U-K15 helps maintain system integrity by promptly interrupting fault currents while preserving downstream equipment. Its ABB lineage signals quality, predictable trip characteristics, and a design that technicians can rely on during routine maintenance or after a fault event.

Tips for integration and use

Ensure compatibility with your panel or enclosure’s bus and mounting style, and verify that the S203U-K15 matches the original device’s electrical characteristics. When replacing an existing breaker, confirm the part number and specifications align with your current 3‑phase, 240 V setup to maintain consistent protection across the system.