{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803U-K70","brand":"ABB","brandSlug":"abb","productSlug":"S803U-K70","canonicalUrl":"https://aoctrl.com/abb/S803U-K70","factsUrl":"https://aoctrl.com/api/mcp/products/S803U-K70","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803U-K70, Miniature Circuit Breaker, Molded Case, 70A, 3-Pole, 240VAC, K Trip Curve, 50 kAIC, DIN Rail Mount.","salesMarkdown":"## 70A K-Curve MCB for Panel Protection The ABB S803U-K70 is a 70-amp, 3-pole miniature circuit breaker with a K trip curve, rated for 240 VAC and a 50 kA interrupting capacity. The K-curve trips between 10x and 14x rated current, making it suited for motor and transformer branch circuits where inrush current is higher than a standard C-curve would tolerate without nuisance tripping. The K-curve's 10–14x magnetic trip band handles the inrush of motor starters and power supplies that would push a B- or C-curve breaker into nuisance trips, yet still clears a hard short fast enough to protect downstream wiring.","metaTitle":"S803U-K70 ABB Miniature Circuit Breaker, 70A 3P K-Curve, 50k","metaDescription":"S803U-K70 ABB miniature circuit breaker, 70A 3-pole K-curve, 240VAC, 50 kAIC. DIN rail mount, current lifecycle status. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"title":"S803U-K70","Part #":"S803U-K70","Weight":"0.91 kgs","Category":"Circuit Breakers","description":"Circuit Breaker, Miniature, DIN Rail Mount, 70A, 3P, 240VAC, K Trip|Circuit Breaker, Miniature, DIN Rail Mount, 70 Amp, 3 Pole, 240 Volt AC, K Trip, 50 kAIC","Sub Category":"Molded Case Circuit Breakers","Top Category":"Circuit Breakers, Fuses & Protection","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$432.24","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4c0299e77222485e3d6fb9de92f8bfb2.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy S803U-K70 and how is it quoted?","answer":"The S803U-K70 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at the time of quotation."},{"question":"What is the interrupting rating of S803U-K70?","answer":"The S803U-K70 has a 50 kA interrupting capacity at 240 VAC, meaning it can safely clear fault currents up to 50,000 amps."},{"question":"What does the K-curve mean on this breaker?","answer":"The K-curve trips magnetically between 10x and 14x rated current (700–980 A for this 70 A unit), making it suitable for motor and transformer branch circuits with high inrush."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803U-K70","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/S803U-K70 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}}