{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S201MUC-K1","brand":"ABB","brandSlug":"abb","productSlug":"S201MUC-K1","canonicalUrl":"https://aoctrl.com/abb/S201MUC-K1","factsUrl":"https://aoctrl.com/api/mcp/products/S201MUC-K1","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200MUC series, 1-pole miniature circuit breaker, Trip Curve K, 1 A, 277 V AC / 250 V DC, 6 kA / 10 kA interrupting capacity, DIN rail mount.","salesMarkdown":"The K curve trips magnetically at 8–12× In, which means it tolerates the brief inrush of small transformers, solenoids, or motor starters without nuisance opening — while still protecting the 1 A circuit against hard faults. At 277 V AC (line-to-neutral in North American 480Y/277 V panels) it interrupts up to 6 kA; on the DC side, the same unit clears faults at 250 V DC with a 10 kA interrupting rating, making it usable in DC sub-distribution or PV combiner boxes where DC arc extinction is more demanding. The single-pole width (roughly 17.5 mm) leaves room for adjacent breakers in a multi-pole assembly. Spring-cage terminals accept 0.2–2.5 mm² solid or ferruled stranded conductors; strip length 8 mm avoids whiskers under the cage. ## How it differs from a Curve C sibling The closest peer in the same S200MUC family is the S201M-C3 (3 A, Curve C). Both share the 1-pole DIN-rail footprint, 277 V AC / 6 kA interrupting rating, and 10 kA DC rating. The deciding difference is the trip curve: Curve C trips at 5–10× In, while Curve K trips at 8–12× In. For a 1 A circuit feeding a control transformer or a contactor coil, the K curve's higher magnetic threshold avoids nuisance trips on the inrush — the C curve at 3 A would be a different amp rating and a tighter tolerance on inrush. If the panel was originally specified with S201M-C3, swapping to the K-curve variant requires checking that the load's inrush profile and the required interrupting capacity still align.","metaTitle":"ABB S201MUC-K1 S200MUC MCB, 1P K 1A, 277 V AC / 250 V DC","metaDescription":"ABB S201MUC-K1 miniature circuit breaker, 1-pole, Trip Curve K, 1 A, 277 V AC / 250 V DC, 6 kA / 10 kA interrupting capacity. DIN rail mount. Current production. Available to order","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"1","Type":"Trip Curve K","Poles":"1","title":"S201MUC-K1","Mounting":"DIN Rail","Volts AC":"277","Volts DC":"250","description":"ABB S201MUC-K1 MCB S200MUC 1P K 1A|ABB S201MUC-K1","lifecycle_stage":"current","Interrupt Rating AC":"6 kA","Interrupt Rating DC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$113.13","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5d67d5c15f835d6478287f27b8cbb5e2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy S201MUC-K1 and how do I get a price?","answer":"The S201MUC-K1 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."},{"question":"What is S201MUC-K1's listed amps and type?","answer":"The S201MUC-K1 is rated 1 A with Trip Curve K (magnetic trip at 8–12× In)."},{"question":"Will S201MUC-K1 drop into a panel that was specified around S201M-C3 without rewiring?","answer":"The S201MUC-K1 shares the same 1-pole DIN-rail footprint and terminal layout as the S201M-C3, so it fits the same panel slot and bus bar. The key difference is the trip curve (K vs C) and amp rating (1 A vs 3 A). Verify that the load's inrush profile and ampacity match the K-curve 1 A rating before substituting."},{"question":"What compliance documentation does ABB provide for S201MUC-K1?","answer":"ABB provides RoHS and REACH declarations for the S200MUC series; the product carries UL, CSA, and CE approvals as standard for the family. Specific certification documents are available on request with the RFQ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S201MUC-K1","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/S201MUC-K1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}