{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9N18377","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9N18377","canonicalUrl":"https://aoctrl.com/schneider/A9N18377","factsUrl":"https://aoctrl.com/api/mcp/products/A9N18377","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Acti9 C120, miniature circuit breaker, 4P, 125 A, C curve, 10 kA Icn at 400 V AC, clip-on DIN rail.","salesMarkdown":"The Schneider Electric A9N18377 is a 4-pole Acti9 C120 miniature circuit breaker rated 125 A at 30 °C, with a C-curve magnetic trip (5–10 × In) and a thermal-magnetic trip unit. It clips onto a 35 mm symmetrical DIN rail for panel mounting. Breaking capacity: 10 kA Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 380–415 V AC per EN/IEC 60947-2. ## Integration notes Width is 108 mm (12 × 9 mm pitches). Tunnel terminals accept 1–50 mm² rigid or 1.5–35 mm² flexible wire; strip length 15 mm, torque to 3.5 N·m. Neutral on the left, 4 protected poles, toggle control with ON/OFF local indication. Earth-leakage protection requires a separate block — not integrated. Suitable for isolation per IEC 60947-2.","metaTitle":"Schneider Electric A9N18377 Acti9 C120 MCB, 125 A, C Curve,","metaDescription":"Schneider Electric A9N18377 Acti9 C120 miniature circuit breaker, 125 A rated, C curve, 4 poles, 10 kA Icn at 400 V AC. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"73 mm","Range":"Acti9","Width":"108 mm","title":"A9N18377","Colour":"White","Height":"81 mm","Standards":"EN/IEC 60898-1 EN/IEC 60947-2","Curve code":"C","description":"C120N - circuit breaker - 3P + N - 125A - C curve","9 Mm Pitches":"12","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","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60947-2","Breaking capacity":"10000 A Icn at 400 V AC 50/60 Hz conforming to EN/IEC 60898-1 6 kA Icu at 440 V AC 50/60 Hz conforming to EN/IEC 60947-2 20 kA Icu at 220...240 V AC 50/60 Hz conforming to EN/IEC 60947-2 10 kA Icu at 380...415 V AC 50/60 Hz conforming to EN/IEC 60947-2 10 kA Icu at <= 500 V DC conforming to EN/IEC 60947-2","Device short name":"C120N","Network frequency":"50/60 Hz","Poles description":"4P","Relative humidity":"95 % at 55 °C","Tightening torque":"3.5 N.m","Device application":"Distribution","Operating altitude":"2000 m","[In] rated current":"125 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":"5...10 x In","Earth-leakage protection":"Separate block","Number of protected poles":"4","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 220...240 V AC 50/60 Hz 440 V AC 50/60 Hz 230...400 V AC 50/60 Hz","Ambient air temperature for storage":"-40...85 °C","Ambient air temperature for operation":"-25...70 °C","[Ics] rated service breaking capacity":"7500 A 75 % conforming to EN/IEC 60898-1 - 400 V AC 50/60 Hz 4.5 kA 75 % conforming to EN/IEC 60947-2 - 440 V AC 50/60 Hz 7.5 kA 75 % conforming to EN/IEC 60947-2 - 380...415 V AC 50/60 Hz 15 kA 75 % conforming to EN/IEC 60947-2 - 220...240 V AC 50/60 Hz 10 kA 100 % conforming to EN/IEC 60947-2 - <= 500 V DC","[Uimp] rated impulse withstand voltage":"6 kV conforming to EN/IEC 60947-2","Comb busbar and distribution block compatibility":"YES"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$128.01 – $212.12","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/351e8c82b62e1281e1fcff41f921ef20.pdf","sourceUrl":"https://www.se.com/ae/en/product/A9N18377/c120n-circuit-breaker-3p-+-n-125a-c-curve/"},"ai":{"faq":[{"question":"What is the breaking capacity of A9N18377?","answer":"10 kA Icn at 400 V AC per EN/IEC 60898-1, and 10 kA Icu at 380–415 V AC per EN/IEC 60947-2. Also rated 20 kA Icu at 220–240 V AC and 6 kA Icu at 440 V AC."},{"question":"Where can I buy A9N18377?","answer":"Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time."},{"question":"What standards does A9N18377 comply with?","answer":"EN/IEC 60898-1 and EN/IEC 60947-2. Also conforms to IEC 60068-1 for tropicalisation (class 2) and IEC 60529 for IP20 protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9N18377","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/A9N18377 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}}