{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S803S-C125","brand":"ABB","brandSlug":"abb","productSlug":"S803S-C125","canonicalUrl":"https://aoctrl.com/abb/S803S-C125","factsUrl":"https://aoctrl.com/api/mcp/products/S803S-C125","rawCanonicalId":null},"summary":{"shortDescription":"ABB S800S series, S803S-C125, 3-pole MCB, 125 A, Trip Curve C, DIN rail mount, 50 kA interrupting capacity at 230 VAC.","salesMarkdown":"## 125 A, Curve C — the MCCB alternative on a DIN rail That 125 A rating puts it above the typical 63 A ceiling of standard miniature circuit breakers — it bridges into territory where a panel builder would otherwise reach for a molded-case breaker. The 50 kA interrupting capacity at 230 VAC means it handles high-fault-current scenarios without cascading upstream, which simplifies coordination studies on a distribution board. DIN rail mounting keeps it in the same panel footprint as the rest of the S800 family, so no extra bracketing or busbar work. Trip Curve C means the magnetic trip threshold is 5 to 10 times the rated current — so for this 125 A breaker, instantaneous trip starts between 625 A and 1250 A. That suits general-distribution loads like lighting banks, small motor groups, and resistive heaters where inrush isn't extreme. For a 3-pole configuration on a 230 VAC line, that's typically a line-to-neutral or line-to-line fault scenario in a three-phase distribution panel. ## DIN rail integration note The S800S body width for a 3-pole unit is 3 x 17.5 mm = 52.5 mm, which matches the modular pitch of most distribution boards. No special busbar adapters needed — the line and load terminals accept standard pin or fork busbars from the S800 accessory range. Keep the ambient temperature inside the enclosure below 40 °C for full 125 A rating; derate per the thermal curve above that.","metaTitle":"ABB S803S-C125 MCB S800S 3P C 125A, 50 kA","metaDescription":"ABB S803S-C125 MCB, S800S series, 3-pole, 125A, Trip Curve C, 50 kA interrupting at 230 VAC. Current lifecycle. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Amps":"125","Type":"Trip Curve C","Poles":"3","title":"S803S-C125","Mounting":"DIN Rail","Volts AC":"230","description":"ABB S803S-C125 MCB S800S 3P C 125A|ABB S803SC125","lifecycle_stage":"current","Interrupt Rating AC":"50 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$233.68","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cbcd376236dfae510be250740dd94c12.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the interrupting rating of S803S-C125?","answer":"50 kA at 230 VAC. That's a high-fault rating for a DIN-rail MCB — it allows this breaker to be used in main-distribution positions with high available fault current without needing an upstream current-limiting fuse."},{"question":"Will S803S-C125 drop into a panel specified around S203-C8?","answer":"No — the S203-C8 is an 8 A, 10 kA interrupting, 3-pole MCB from the S200 series. The S803S-C125 is 125 A with 50 kA interrupting, a physically larger frame (S800S vs S200), and different busbar spacing. The panel would need full re-engineering of the busbar, thermal budget, and fault-withstand coordination."},{"question":"Where can I buy S803S-C125?","answer":"Sourced to order against an RFQ through independent distribution channels. Availability and current pricing confirmed at quote time — submit an RFQ for a firm price and lead-time estimate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S803S-C125","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-C125 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}}