{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201-K8","brand":"ABB","brandSlug":"abb","productSlug":"S201-K8","canonicalUrl":"https://aoctrl.com/abb/S201-K8","factsUrl":"https://aoctrl.com/api/mcp/products/S201-K8","rawCanonicalId":null},"summary":{"shortDescription":"ABB S201-K8, 1-pole miniature circuit breaker, 8 A, K trip curve, 277 V AC, 6 kA interrupting, DIN rail mount, S200 series.","salesMarkdown":"The ABB S201-K8 is a single-pole miniature circuit breaker from the S200 series, rated 8 A with a K trip curve at 277 V AC. The 1-pole format handles a single-phase 277 V leg. ## K curve — why it matters for the loads you actually see A K-curve breaker sits between the standard C curve and the high-inrush D curve. It trips magnetically at roughly 8 to 12 times rated current, so at 8 A that's about 64 to 96 A instantaneous pickup. That's high enough to pass through a motor start or a transformer energization without popping, but low enough to catch a bolted fault before the wire insulation melts. In practice, this makes the S201-K8 a good fit for motor branch circuits, power supplies, and lighting ballasts — loads that draw a brief spike on startup but settle to a steady-state draw well under 8 A. At 10 A that's 50 to 100 A magnetic pickup — similar range but with a higher continuous rating and a different curve shape. If your panel was originally specified around a C curve and you're swapping in a K curve, the thermal trip (overload) behavior is similar; the difference is in the magnetic trip threshold for short circuits. For most motor and transformer loads the K curve is actually the better choice — it's less likely to nuisance-trip on inrush. The S201-K8 is UL 1077 recognized and CSA 22.2 certified as a supplemental protector.","metaTitle":"S201-K8 Miniature Circuit Breaker, 8A, 1P, K Curve, 6kA","metaDescription":"S201-K8 8A 1-pole K-curve MCB, 277VAC, 6kA interrupting. UL 1077 supplemental protector. Current production, sourced to order. Request quote for pricing and availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"8","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":"$53.44","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1b888e9d473400bd32917551d1de57a0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S201-K8/alternatives.json"},"ai":{"faq":[{"question":"What is the S201-K8's interrupting rating?","answer":"It interrupts AC faults up to 6 kA at 277 V. That covers most branch circuits in industrial control panels where the available fault current is below that level."},{"question":"Will the S201-K8 drop into a panel specified around the S201M-C10?","answer":"Yes — same S200 series, same 1-pole DIN-rail footprint, same terminal layout. The difference is the trip curve: K vs C. The K curve handles higher inrush, so it's actually a better fit for motor and transformer loads. No rewiring needed."},{"question":"What compliance documentation does ABB provide for the S201-K8?","answer":"The S201-K8 is UL 1077 recognized and CSA 22.2 certified as a supplemental protector. ABB publishes RoHS and REACH declarations for the S200 series. The nameplate carries the ratings and standards for panel documentation."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201-K8","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-K8 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}}