{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S202MUC-K25","brand":"ABB","brandSlug":"abb","productSlug":"S202MUC-K25","canonicalUrl":"https://aoctrl.com/abb/S202MUC-K25","factsUrl":"https://aoctrl.com/api/mcp/products/S202MUC-K25","rawCanonicalId":null},"summary":{"shortDescription":"ABB S200MUC series, S202MUC-K25, miniature circuit breaker, 2-pole, trip curve K, 25 A, 277 VAC / 500 VDC, 6 kA AC / 10 kA DC interrupting capacity, DIN-rail mount.","salesMarkdown":"## What the K-curve means for your load K-curve breakers are built for inductive loads — transformers, solenoids, motor starters — where the inrush current can be several times the full-load rating. The K-curve holds the magnetic trip at 10–14× rated current (here 250–350 A instantaneous), so it won't nuisance-trip on transformer energization or coil pickup. That's the key difference from a B-curve (3–5×) or C-curve (5–10×) in the same S200MUC family. If your BOM line is protecting a 24 VDC control transformer or a bank of contactor coils, the K-curve is the right call. ## Integration note The 2-pole footprint occupies two module widths (roughly 36 mm). Terminals accept 0.5–25 mm² conductor; torque to 2.5 Nm. For DC circuits, observe polarity markings on the breaker — the S200MUC series is polarity-sensitive on DC, so wire the line side to the marked terminal. No auxiliary contact slot on this base model; if you need a remote trip indication, step to the S200MUC variant with the integrated auxiliary contact.","metaTitle":"ABB S202MUC-K25 S200MUC MCB, 2P K-Curve 25A, 277VAC/500VDC","metaDescription":"ABB S202MUC-K25 S200MUC miniature circuit breaker, 2-pole, K-curve, 25 A, 277 VAC / 500 VDC, 6 kA AC / 10 kA DC interrupting capacity. DIN-rail mount. Current-production part. Sour","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Amps":"25","Type":"Trip Curve K","Poles":"2","Mounting":"DIN Rail","Volts AC":"277","Volts DC":"500","lifecycle_stage":"current","Interrupt Rating AC":"6 kA","Interrupt Rating DC":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/66bb742cd4e4a99eacc269b85e6d2228.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/S202MUC-K25/alternatives.json"},"ai":{"faq":[{"question":"What is the K-curve trip characteristic on this breaker?","answer":"The K-curve provides magnetic trip at 10–14 times rated current (250–350 A for this 25 A breaker), making it suitable for inductive loads such as transformers, solenoids, and motor starters that draw high inrush current."},{"question":"What are the interrupting ratings for the S202MUC-K25?","answer":"The S202MUC-K25 is rated for 6 kA interrupting capacity at 277 VAC and 10 kA at 500 VDC. These ratings are sufficient for branch-circuit protection in most industrial and commercial panels."},{"question":"Will the S202MUC-K25 fit in a panel designed for the S202M-B10?","answer":"Yes, both breakers share the same S200MUC platform — same 2-pole DIN-rail footprint, same terminal layout, same module width. The only difference is the trip curve (K vs. B) and the current rating (25 A vs. 10 A). No rewiring or panel modification is needed to swap them."},{"question":"Where can I buy the S202MUC-K25 and get current pricing?","answer":"The S202MUC-K25 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S202MUC-K25","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/S202MUC-K25 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}}