{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-K25","brand":"ABB","brandSlug":"abb","productSlug":"S803S-K25","canonicalUrl":"https://aoctrl.com/abb/S803S-K25","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-K25","rawCanonicalId":null},"summary":{"shortDescription":"ABB S803S-K25, 25 A, 3-pole, Trip Curve K, DIN-rail miniature circuit breaker, 50 kA interrupting capacity at 400 VAC.","salesMarkdown":"The S803S-K25 is a 25 A, 3-pole miniature circuit breaker with Trip Curve K, meaning its magnetic trip threshold sits between 8× and 12× rated current — designed for loads with moderate inrush, like motor starters, transformers, and solenoid banks where a Curve C would nuisance-trip on startup but a Curve D is overkill. Rated 400/690 VAC and 375 VDC, with a 50 kA interrupting capacity at 400 VAC — that's a high-fault rating for a 25 A frame, so it handles industrial panel feeds with stiff upstream transformers without cascading failure. The thermal-magnetic trip mechanism uses a bimetal strip for overload protection and an electromechanic solenoid for short-circuit response; the K-curve's wider magnetic band means it passes the inrush of a 15–20 hp motor at full voltage without opening, but still clears a bolted fault in under 10 ms. Snaps onto standard 35 mm DIN rail per EN 60715; the 3-pole body occupies three modular units (17.5 mm per pole), so it fits a standard 18-module enclosure with room for a feeder and two branch breakers. Rated frequency is 50/60 Hz, so it's at home in both 50 Hz European and 60 Hz North American panels — no derating needed for the frequency shift.","metaTitle":"S803S-K25 25A 3-Pole Trip Curve K MCB, 50 kA","metaDescription":"S803S-K25 circuit breaker, 25 A, 3-pole, Trip Curve K, 50 kA interrupting capacity at 400 VAC. Current production. Sourced 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":"25","Type":"Trip Curve K","Poles":"3","title":"S803S-K25","Mounting":"DIN Rail","Volts AC":"230","description":"Circuit Breaker, 25A, 3P|Circuit Breaker, 25 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":"$153.67","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/151d54582c32611a655baced999c9ee1.pdf","sourceUrl":null},"ai":{"faq":[{"question":"Where can I buy the S803S-K25 and get a price?","answer":"The S803S-K25 is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What is the S803S-K25's interrupting rating?","answer":"The S803S-K25 has a 50 kA interrupting capacity at 400 VAC, which is high for a 25 A frame and suitable for industrial panels with high fault current potential."},{"question":"Will the S803S-K25 drop into a panel specified around the S203-D13?","answer":"No — the S203-D13 is a 10 A, 3-pole, Curve D breaker with a 10 kA interrupting rating at 277 VAC, while the S803S-K25 is 25 A, Curve K, and 50 kA at 400 VAC. The S803S-K25 is a larger frame (S800 series vs S200 series) and will not physically interchange without rewiring the busbar and enclosure."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-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/S803S-K25 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}}