{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N18403","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N18403","canonicalUrl":"https://aoctrl.com/schneider/A9N18403","factsUrl":"https://aoctrl.com/api/mcp/products/A9N18403","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Acti9 C120H miniature circuit-breaker, A9N18403, 1-pole, 100 A rated current at 30 °C, curve B, 15 kA Icn at 230/400 V AC, clip-on DIN rail mount.","salesMarkdown":"The A9N18403 is a 1-pole Acti9 C120H miniature circuit-breaker rated 100 A at 30 °C with a B-curve trip characteristic (magnetic tripping between 3 and 5 times In). The B curve means it holds through moderate inrush (resistive loads, lighting banks, control transformers) but trips fast on a hard short: magnetic pickup starts at 300 A and is guaranteed by 500 A. Breaking capacity is 15 kA Icn at 230/400 V AC per EN/IEC 60898-1, and 15 kA Icu at 220…240 V AC per EN/IEC 60947-2. That 15 kA at 230/400 V is the fault current it can safely interrupt without welding contacts or rupturing the case — enough for most commercial and light industrial distribution boards fed from a typical 200–400 kVA transformer. The dual standard (60898-1 for household-type installation and 60947-2 for industrial application) means this breaker can serve in either a consumer unit or an industrial panel, as long as the prospective short-circuit current at its mounting point stays under 15 kA. At 27 mm wide (3 x 9 mm pitches), a single-pole breaker takes one module position, so you can pack 12 poles per 360 mm of DIN rail. The tunnel-type terminals accept up to 50 mm² rigid or 35 mm² flexible cable, with a tightening torque of 3.5 N·m and a strip length of 15 mm — sized for the 100 A feed conductor. ## Sourcing and lifecycle — active, no end-of-life signal Compliance documentation is straightforward: the breaker is certified to EN/IEC 60898-1 and EN/IEC 60947-2, carries IP20 finger protection, and is suitability marked for isolation per IEC 60947-2. ## Integration into a distribution board The A9N18403 sits in a standard 35 mm DIN-rail enclosure. Its 73 mm depth and 81 mm height fit within the envelope of a typical 200 mm deep distribution board, leaving clearance for outgoing cables and busbar connections. The toggle control provides local ON/OFF indication and a contact position indicator — useful for lockout/tagout verification without removing the front cover. Electrical durability is rated at 5000 cycles per IEC 60947-2, mechanical durability at 20,000 cycles. For a distribution breaker that sees infrequent switching (maybe a few operations per year during maintenance), that endurance is effectively unlimited.","metaTitle":"Schneider Electric A9N18403 Acti9 C120H MCB, 1P, 100 A, Curv","metaDescription":"Schneider Electric A9N18403 Acti9 C120H miniature circuit-breaker, 1-pole, 100 A rated current, curve B, 15 kA breaking capacity at 230/400 V AC. Active production. Sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"73 mm","Range":"Acti9","Width":"27 mm","title":"A9N18403","Colour":"White","Height":"81 mm","Standards":"EN/IEC 60898-1 EN/IEC 60947-2","Curve code":"B","description":"Miniature circuit breaker (MCB), Acti9 C120H, 1P, 100A, B curve, 15000A (IEC/EN 60898-1), 15kA (IEC/EN 60947-2)","9 Mm Pitches":"3","Control type":"Toggle","Network type":"AC","Product name":"Acti9 C120","Mounting mode":"Clip-on","Tropicalisation":"2 conforming to IEC 60068-1","lifecycle_stage":"current","Limitation class":"3 conforming to EN/IEC 60947-2","Local signalling":"ON/OFF indication","Mounting support":"35 mm symmetrical DIN rail","Pollution degree":"3 conforming to IEC 60947-2","Breaking capacity":"30 kA Icu at 130 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA Icu at 12 V DC conforming to EN/IEC 60947-2 20 kA Icu at 125 V DC conforming to EN/IEC 60947-2 15 kA Icu at 15 kA Icu at 220...240 V AC 50/60 Hz conforming to EN/IEC 60947-2 15000 A Icn at 230/400 V AC 50/60 Hz conforming to EN/IEC 60898-1 4.5 kA Icu at 380...415 V AC 50/60 Hz IT conforming to EN/IEC 60947-2 30 kA Icu at 12 V AC 50/60 Hz conforming to EN/IEC 60947-2","Device short name":"C120H","Network frequency":"50/60 Hz","Poles description":"1P","Relative humidity":"95 % at 55 °C","Tightening torque":"3.5 N.m","Device application":"Distribution","Operating altitude":"2000 m","[In] rated current":"100 A at 30 °C","Overvoltage category":"IV","Trip unit technology":"Thermal-magnetic","Electrical durability":"5000 cycles conforming to IEC 60947-2","Mechanical durability":"20000 cycles","Wire stripping length":"15 mm","Connections - terminals":"Tunnel type terminals1...50 mm² rigid Tunnel type terminals1.5...35 mm² flexible","IP degree of protection":"IP20 conforming to IEC 60529","Magnetic tripping limit":"3...5 x In","Earth-leakage protection":"Without","Number of protected poles":"1","Product or component type":"Miniature circuit-breaker","Suitability for isolation":"Yes conforming to IEC 60947-2","Contact position indicator":"Yes","Locking options description":"Handle sealable with cable diameter 0.7mm in OFF or ON position","[Ui] rated insulation voltage":"500 V AC 50/60 Hz conforming to EN/IEC 60947-2","[Ue] rated operational voltage":"380...415 V AC 50/60 Hz 125 V DC 12 V DC 220...240 V AC 50/60 Hz 230...400 V AC 50/60 Hz 130 V AC 50/60 Hz 12 V AC 50/60 Hz","Ambient air temperature for storage":"-40...70 °C","Ambient air temperature for operation":"-30...60 °C","[Ics] rated service breaking capacity":"15 kA 50 % conforming to EN/IEC 60947-2 - 130 V AC 50/60 Hz 7.5 kA 50 % conforming to EN/IEC 60947-2 - 220...240 V AC 50/60 Hz 2.25 kA 50 % conforming to EN/IEC 60947-2 - 380...415 V AC 50/60 Hz 7500 A 50 % conforming to EN/IEC 60898-1 - 230/400 V AC 50/60 Hz 20 kA 100 % conforming to EN/IEC 60947-2 - 12 V DC 15 kA 100 % conforming to EN/IEC 60947-2 - 20 kA 100 % conforming to EN/IEC 60947-2 - 125 V DC 15 kA 50 % conforming to EN/IEC 60947-2 - 12 V AC 50/60 Hz","[Uimp] rated impulse withstand voltage":"6 kV conforming to EN/IEC 60947-2","Comb busbar and distribution block compatibility":"NO"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/067260853fdba905af941bac00f2d148.pdf","sourceUrl":"https://www.se.com/sa/en/product/A9N18403/miniature-circuit-breaker-mcb-acti9-c120h-1p-100a-b-curve-15000a-iec-en-608981-15ka-iec-en-609472/"},"ai":{"faq":[{"question":"What is A9N18403's listed range (Acti9) on this component line?","answer":"The A9N18403 belongs to the Acti9 range, Schneider Electric's modular DIN-rail system for final distribution. The specific product name is Acti9 C120, and the device short name is C120H."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N18403","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/A9N18403 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}}