{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-K50","brand":"ABB","brandSlug":"abb","productSlug":"S201-K50","canonicalUrl":"https://aoctrl.com/abb/S201-K50","factsUrl":"https://aoctrl.com/api/mcp/products/S201-K50","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200 series, S201-K50, 1-pole K-curve miniature circuit breaker, 50 A, 277 VAC, 6 kAIC, DIN rail mount, UL 1077 supplemental protector.","salesMarkdown":"## 50 A K-curve breaker for 480Y/277 V panels The ABB S201-K50 is a single-pole 50 A miniature circuit breaker with a K-curve trip characteristic, rated at 277 VAC and a 6 kA interrupting capacity. It's a UL 1077 supplemental protector from the S200 series, designed for 480Y/277 V systems where you need branch-circuit overcurrent protection on a single leg to neutral. That 50 A rating handles heavy individual loads like a large conveyor drive or a compressor bank. Single-pole footprint means it takes one module width (roughly 18 mm) in the enclosure. For a 50 A breaker at 277 V, expect 14 AWG to 6 AWG wire range on the terminals — torque to the values stamped on the side.","metaTitle":"ABB S201-K50 50A K-Curve MCB, 277V, 6kAIC, DIN Rail","metaDescription":"ABB S201-K50 50A K-curve miniature circuit breaker, 277 VAC, 6 kAIC. UL 1077 supplemental protector for 480Y/277 V systems. Active production, sourced to order. Request RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"50","Type":"Trip Curve K","Poles":"1","Mounting":"DIN Rail","Volts AC":"277","lifecycle_stage":"current","Interrupt Rating AC":"6 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$9.49","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S201-K50/alternatives.json"},"ai":{"faq":[{"question":"What is the S201-K50's interrupting rating?","answer":"The S201-K50 has a 6 kA interrupting capacity at 277 VAC. That's the maximum fault current it can safely clear under short-circuit conditions — adequate for most downstream supplemental protection applications in 480Y/277 V panels where the upstream feeder breaker provides the main fault limitation."},{"question":"Where can I buy the S201-K50 and get current pricing?","answer":"The S201-K50 is available to order through independent distribution. Submit an RFQ with your quantity and target delivery — we'll confirm availability and provide current pricing at quote time."},{"question":"Will the S201-K50 drop into a panel specified around the S201M-C3?","answer":"Physically yes — both are single-pole DIN-rail breakers from the S200 series with the same footprint and mounting. The functional difference is the trip curve: the S201-K50 uses a K-curve (8-12x magnetic trip for motor/inductive loads), while the S201M-C3 uses a C-curve (5-10x for general-purpose). If the original design called for a C-curve, verify the load's inrush characteristic before substituting a K-curve — the K-curve holds longer on inrush, which could mean less nuisance tripping on motor starts but may not clear a lower-level fault as fast."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-K50","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/abb/S201-K50 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}