ABB S203U-K40 Circuit Breaker, 40A, 3-Pole, 240V

ABB S203U-K40 circuit breaker delivers dependable overcurrent protection for industrial electrical service, routine maintenance, and replacement projects. With a 40 A rating across 3 poles at 240 V, this device is built for three-phase applications and rugged environments where protecting motors, drives, and control circuits matters most. Always verify fit by the part number (S203U-K40) against your panel and application requirements.

Designed for robust industrial protection

Engineered by ABB, the S203U-K40 provides solid, proven protection for demanding industrial settings. Its three-pole configuration is ideal for three-phase power distribution, helping to safeguard connected equipment and wiring from overloads and faults. By interrupting fault currents promptly, it reduces downtime and potential damage to critical machinery on manufacturing floors, processing lines, and large control panels.

Key benefits and use cases

• Three‑phase protection: 3-pole design supports 3-phase systems common in factories and industrial plants.
• Precise 40 A protection: 40 A rating suits moderate to heavy loads while preventing nuisance tripping on normal operation.
• 240 V operation: Compatible with standard industrial 240 V three-phase power distribution.
• Easy compatibility verification: Use part number S203U-K40 to confirm fit with your panel, enclosure, and application requirements.
• Reliable sourcing: ABB’s established manufacturing standards help simplify procurement and maintenance planning for replacements and upgrades.

Ideal for

• Factories and manufacturing lines with three-phase motors and machinery
• Motor control centers and large control panels requiring dedicated overcurrent protection
• Electrical service upgrades or panel replacements where a compatible ABB device is preferred
• Maintenance projects that rely on readily identifiable part numbers for quick cross-checks

Compatibility and installation tips

To ensure a seamless fit, verify the part number S203U-K40 against your equipment specifications and the panel’s accepted accessories. When in doubt about compatibility with your specific application, reach out for guidance to confirm that the 3-pole, 40 A, 240 V configuration aligns with your circuit protection strategy and panel design.

Technical specifications

• Manufacturer: ABB
• Part number: S203U-K40
• Amperage rating: 40 A
• Poles: 3
• Voltage: 240 V

Whether you’re upgrading an aging installation or stocking parts for a preventive maintenance program, the ABB S203U-K40 40 A 3‑pole 240 V circuit breaker offers precise, reliable performance for demanding industrial environments. If you need help confirming compatibility, send a message and we’ll assist in matching the part number to your exact application.