{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S802S-UCB125","brand":"ABB","brandSlug":"abb","productSlug":"S802S-UCB125","canonicalUrl":"https://aoctrl.com/abb/S802S-UCB125","factsUrl":"https://aoctrl.com/api/mcp/products/S802S-UCB125","rawCanonicalId":null},"summary":{"shortDescription":"ABB S802S-UCB125, High Performance Miniature Circuit Breaker, 2 Pole, 125 Amp, Trip Curve B, 480 VAC / 250 VDC, 50 kA interrupting rating, DIN Rail mount.","salesMarkdown":"## What this 125 A curve-B MCB does for your panel The ABB S802S-UCB125 is a 2-pole high-performance miniature circuit breaker rated 125 A with Trip Curve B, meaning it trips magnetically between 3× and 5× rated current — fast enough to clear a hard short before downstream devices take damage, but it won't nuisance-trip on moderate motor inrush or transformer charging currents. Rated 480 VAC and 250 VDC with a 50 kA interrupting capacity on both AC and DC sides, this breaker handles high-fault scenarios like industrial feeder panels or UPS output circuits where standard 10 kA MCBs would weld their contacts shut. Mounts on standard DIN rail — drops into any 35 mm rail panel without adapters. ## Sourcing and lifecycle — still a current-production part","metaTitle":"S802S-UCB125 ABB S802S High Perf MCB, 2P, 125A, Curve B","metaDescription":"ABB S802S-UCB125 high performance MCB, 2-pole, 125 A, Trip Curve B, 480 VAC / 250 VDC, 50 kA interrupting rating. In current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Amps":"125","Type":"Trip Curve B","Poles":"2","title":"S802S-UCB125","Mounting":"DIN Rail","Volts AC":"480","Volts DC":"250","description":"High Performance Circuit Breaker, 2P, 125A|High Performance Miniature Circuit Breaker, 2 Pole, 125 Amp","lifecycle_stage":"current","Interrupt Rating AC":"50 kA","Interrupt Rating DC":"50 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fef470ae87045cc40346574bf196f69b.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What are the key ratings for S802S-UCB125?","answer":"125 A, Trip Curve B, 2 poles, 480 VAC / 250 VDC, 50 kA interrupting capacity on both AC and DC, DIN rail mount."},{"question":"What is the closest functional second-source to S802S-UCB125 — S202M-B10?","answer":"No — the S202M-B10 is a 10 A, 277 VAC / 125 VDC, 6 kA AC / 10 kA DC breaker. The S802S-UCB125 has 12.5× the ampacity and 8× the interrupt rating; they are not cross-compatible."},{"question":"Will S802S-UCB125 drop into a panel specified around S202M-B10 without rewiring?","answer":"Both mount on DIN rail, but the 125 A S802S-UCB125 requires much larger conductors and a higher-rated busbar than the 10 A S202M-B10 — the panel would need rewiring for ampacity."},{"question":"How do I get current pricing and availability for S802S-UCB125?","answer":"Submit an RFQ — availability and current pricing are confirmed at quote time through independent distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S802S-UCB125","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/S802S-UCB125 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}}