{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-K80","brand":"ABB","brandSlug":"abb","productSlug":"S803S-K80","canonicalUrl":"https://aoctrl.com/abb/S803S-K80","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-K80","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-K80, miniature circuit breaker, 80 A, 3-pole, Trip Curve K, DIN rail mount, 50 kA interrupting rating AC.","salesMarkdown":"Trip Curve K means the magnetic trip operates between 8 and 12 times rated current, which is narrower than Curve C (5–10×) but wider than Curve D (10–20×). For an 80 A breaker, that puts instantaneous magnetic trip between 640 A and 960 A — a good match for inductive loads like transformers or solenoid banks where inrush can briefly hit 8–10× but shouldn't nuisance-trip on a C-curve. The 50 kA interrupting rating at 400/690 VAC tells you this breaker can safely clear a fault up to 50,000 A without welding contacts or rupturing the case — essential for high-fault-capacity panels near large transformers. Three poles let it switch all three phases simultaneously, which matters for any 3-phase load that must not single-phase on a fault. The 3-pole width is 3 module spaces (about 54 mm on most DIN-rail enclosures). For a panel fill calculation, count 3 TE (terminal units) per breaker.","metaTitle":"S803S-K80 80A 3-Pole K-Curve MCB, 50 kA","metaDescription":"S803S-K80 80A 3-pole miniature circuit breaker, Trip Curve K, 50 kA interrupting rating at 400/690 VAC. DIN rail mount, current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"80","Type":"Trip Curve K","Poles":"3","title":"S803S-K80","Mounting":"DIN Rail","Volts AC":"230","description":"Circuit Breaker, 80A, 3P|Circuit Breaker, 80 Amp, 3-Pole, Tripping Characteristic: K, Thermal Tripping Mechanism for Overload Protection, Electromechanic Tripping Mechanism for Short Circuit Protection, Rated Operational Voltage: 400/690 Volts AC, 375 Volts DC, Rated Frequency: 50/60 Hz","lifecycle_stage":"current","Interrupt Rating AC":"50 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$152.40","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6665759e99c032ebe1eca37acb30db67.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the S803S-K80's interrupting rating?","answer":"The S803S-K80 carries a 50 kA interrupting rating at 400/690 VAC, meaning it can safely clear a fault current up to 50,000 A without failing. That's a high-capacity rating suitable for panels fed by large transformers or high-fault utility services."},{"question":"What does Trip Curve K mean on this breaker?","answer":"Trip Curve K means the magnetic (short-circuit) trip operates between 8 and 12 times rated current. For this 80 A breaker, instantaneous trip occurs between 640 A and 960 A. That's tighter than a D-curve (10–20×) but looser than a C-curve (5–10×), making it a good fit for inductive loads like transformers, solenoid banks, or motor starters where inrush can reach 8–10× but shouldn't nuisance-trip a C-curve."},{"question":"Where can I buy the S803S-K80?","answer":"The S803S-K80 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 date and quantity."},{"question":"Will S803S-K80 drop into a panel specified for S203-D13?","answer":"The S803S-K80 shares the same DIN-rail footprint and 3-pole form factor as the S203-D13, so it fits the same panel space and busbar arrangement without rewiring. However, the trip curves differ: S803S-K80 is Curve K (8–12× In), while S203-D13 is Curve D (10–20× In). Verify the load's inrush profile — if the original spec called for D-curve to handle high transformer inrush, a K-curve may trip earlier. For motor or resistive loads, the K-curve is often a direct functional equivalent."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-K80","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/S803S-K80 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}}