ABB S203-K40 40A 3P 480V Circuit Breaker | AmpState

Meet the ABB S203-K40, a robust 40 Amp, 3-pole, 480V circuit breaker designed to protect your three-phase electrical systems. Built by ABB, this unit is a trusted choice for panelboards, load centers, and distribution boards where reliable interruption is critical to safety and uptime.

Whether you're performing a replacement project or stocking spares to keep your BOM aligned with the original part number, the S203-K40 ensures compatibility and fast installation with existing ABB infrastructure.

• Key specs at a glance: 40 A, 3 poles, 480V, ABB part number S203-K40
• Ideal applications: panelboards, load centers, electrical distribution panels
• BOM-aligned replacement: preserves the original bill of materials and cross-reference compatibility
• Reliability from a global brand: ABB engineering and manufacturing heritage supports long-term performance
• Stocked by AmpState: ready-to-ship to minimize downtime

Use scenarios:

• Maintenance and upgrades for three-phase facilities such as data centers, manufacturing floors, and commercial buildings
• Spare parts inventory to ensure quick swaps without BOM mismatches
• Repairs that require fitting within existing ABB switchgear where the original S203-K40 is specified

Why this matters: Matching the exact part number (S203-K40) keeps your equipment compliant with its original design, protects warranty pathways, and reduces the risk of incompatibilities that can lead to unexpected outages.

Need help confirming fit? Our team at AmpState can assist with compatibility checks and part-number matching to ensure this 40 A, 3P, 480V circuit breaker is the right choice for your panelboard or load center. Send us a note and we’ll help you verify the exact fit.

Technical specs recap:

• Manufacturer: ABB
• Part number: S203-K40
• Product type: Circuit Breaker
• Amperage: 40 A
• Poles: 3
• Voltage: 480V