{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"S801S-B40","brand":"ABB","brandSlug":"abb","productSlug":"S801S-B40","canonicalUrl":"https://aoctrl.com/abb/S801S-B40","factsUrl":"https://aoctrl.com/api/mcp/products/S801S-B40","rawCanonicalId":null},"summary":{"shortDescription":"S801S-B40, 40A, 1-Pole, Trip Curve B, DIN Rail, 230 V AC, 50 kA Interrupting Rating.","salesMarkdown":"## 40 A, Curve B, 1-Pole — DIN-Rail MCB It provides thermal-magnetic overload and short-circuit protection for branch circuits up to 40 A, with a 50 kA interrupting rating at 230 V AC — enough to handle high-fault-current industrial panels without cascading upstream. ## What Curve B Means for Your Circuit Trip Curve B means the magnetic trip fires at 3 to 5 times the rated current (120–200 A for this 40 A breaker). It will not nuisance-trip on a motor start the way a B-curve would, but for a 40 A branch feeding a panel of contactors and relays, B-curve is the standard choice. Single-pole width saves space in a crowded enclosure — one module width. Rated for 400/690 V AC and 125 V DC operation at 50/60 Hz, so it can be used in mixed AC/DC control circuits as long as the voltage stays within the DC rating.","metaTitle":"S801S-B40 Circuit Breaker, 40A, 1-Pole, Curve B, DIN Rail","metaDescription":"S801S-B40 40A 1-pole miniature circuit breaker, Trip Curve B, DIN rail mount, 50 kA interrupting capacity at 230 V AC. Current lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Amps":"40","Type":"Trip Curve B","Poles":"1","title":"S801S-B40","Mounting":"DIN Rail","Volts AC":"230","description":"Circuit Breaker, 40A, 1P|Circuit Breaker, 40 Amp, 1-Pole, Tripping Characteristic: B, Thermal Tripping Mechanism, Overload Protection, Rated Operational Voltage: 400/690 Volts AC, 125 Volts DC, Rated Frequency: 50/60 Hz","lifecycle_stage":"current","Interrupt Rating AC":"50 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7e1824794b6e33ca4e4e85dd11f1c88c.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is S801S-B40's listed amps and trip curve?","answer":"40 A, Trip Curve B (magnetic trip 3–5× In)."},{"question":"Where can I buy S801S-B40 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock counts or prices listed here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/abb/S801S-B40","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/S801S-B40 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}}