ABB S201-K50 50A 1P 277V Circuit Breaker | AmpState

ABB S201-K50 is a 50 A, 1-pole, 277 V circuit breaker engineered for everyday electrical work. Designed to protect circuits in panelboards, load centers, and electrical distribution networks, this unit delivers reliable interruption when faults occur. It’s the practical, ready-made choice for maintenance teams, panel builders, and spare inventories where a direct part-number match matters.

• Part Number: S201-K50
• Manufacturer: ABB
• Product Type: Circuit Breaker
• Amperage: 50 A
• Poles: 1
• Voltage: 277 V
• Applications: circuit protection in panelboards, load centers, and electrical distribution
• Availability: AmpState

• Direct part-number match minimizes installation guesswork and speeds up replacements, keeping projects on schedule.
• Compact 1P design fits into tight panel layouts without compromising protection.
• 277 V suitability makes it ideal for commercial/industrial lighting and distribution circuits.
• ABB reliability ensures consistent performance within existing ABB installations and spares pools.

• Who needs this: maintenance crews, electricians, panel manufacturers, and inventory managers who require exact part-number compatibility and dependable protection for 277 V circuits.
• Use cases: replace a blown breaker in an existing ABB system, spec a 277 V 50 A protective device for new panel builds, or maintain an accurate spare parts kit with a direct-fit component.
• Why it matters: selecting the exact S201-K50 eliminates fitment surprises, reduces downtime, and ensures the circuit is protected by a device designed for your system.

Need help matching a part number or confirming compatibility? Message us and we’ll help you confirm fit. AmpState has this ABB circuit breaker in stock, ready to support your project timelines and panel-building needs.