{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C125N45AFM","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C125N45AFM","canonicalUrl":"https://aoctrl.com/schneider/C125N45AFM","factsUrl":"https://aoctrl.com/api/mcp/products/C125N45AFM","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NS new generation, C125N45AFM, 4P molded case circuit breaker, 1250 A at 50 °C, MicroLogic 5.0 A electronic trip unit, 50 kA Icu at 415 V AC, fixed mounting, IP40.","salesMarkdown":"The Schneider Electric C125N45AFM is a ComPacT NS new generation molded case circuit breaker (MCCB) rated 1250 A at 50 °C, in a 4-pole (4P) fixed-mount configuration with a MicroLogic 5.0 A electronic trip unit. It's built for distribution duty per EN/IEC 60947-2, meaning it protects feeders and main switchboards in commercial and industrial power systems — the kind of install where you need selectivity and coordination downstream, not just a simple branch breaker. Breaking capacity is the headline here: 85 kA Icu at 240 V AC, 50 kA at 415 V, 40 kA at 525 V, and 30 kA at 690 V. That S function is what separates a distribution breaker from a simple thermal-magnetic — it lets you coordinate with downstream breakers so only the faulted branch clears, not the whole board. The thermal memory holds for 20 minutes, which matters if you're resetting after a hot overload on a motor feeder. The trip unit includes an ammeter (type of measurement: ammeter) and an LCD display for reading load current locally. Four red LEDs flag fault types; one yellow LED indicates an overload condition. That's useful for an electrician walking the board — they can see at a glance whether the trip was overload or short-circuit without hooking up a laptop. Fixed mounting on a backplate, 280 mm wide by 327 mm tall by 147 mm deep. Connection pitch is 70 mm, and both upside and downside connections are front-facing — that means you can land cables without needing rear access, which is standard for most switchboards but worth confirming if you're retrofitting into a tight enclosure. Manually operated (no motor operator included), with the neutral on the left side of the 4-pole block. Mechanical durability is 10,000 cycles; electrical durability ranges from 2,000 cycles at full-rated 690 V to 5,000 cycles at half-rated 440 V. That's typical for a fixed-mount distribution breaker — it's not designed for frequent switching like a contactor, but it handles routine isolation and infrequent fault clearing without issue. The ComPacT NS new generation family is widely stocked, but a 1250 A frame is a larger unit — lead time can vary with demand, so a firm RFQ is the right next step if you're planning a board build.","metaTitle":"Schneider Electric C125N45AFM ComPacT NS, 1250 A, 50 kA at 4","metaDescription":"Schneider Electric C125N45AFM ComPacT NS new generation molded case circuit breaker, 1250 A, 4P, MicroLogic 5.0 A trip unit, 50 kA breaking capacity at 415 V AC. Active production,","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Range":"ComPacT","title":"C125N45AFM","Depth (D)":"147 mm","Standards":"EN/IEC 60947-2","Width (W)":"280 mm","Height (H)":"327 mm","description":"Circuit breaker, ComPacT NS1250N, 50kA at 415VAC, 4P, fixed, manually operated, MicroLogic 5.0A control unit, 1250A","Control type":"Manually operated","Display type":"LCD display","Network type":"AC","Power losses":"44 W","Product name":"ComPacT NS new generation","Mounting mode":"Fixed","Thermal memory":"20 mn","Trip unit name":"MicroLogic 5.0 A","Number of poles":"4P","Protection type":"L : for overload protection (long time) S : for short time short-circuit protection I : for instantaneous short-circuit protection","lifecycle_stage":"current","Connection pitch":"70 mm","Local signalling":"4 LEDs (red) for fault indication 1 LED (yellow) for overload","Mounting support":"Backplate","Neutral position":"Left","Pollution degree":"3 conforming to IEC 60947","Range of product":"ComPacT NS630b...1600 new generation","Trip unit rating":"1250 A at 50 °C","Breaking capacity":"85 kA Icu at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 50 kA Icu at 440 V AC 50/60 Hz conforming to IEC 60947-2 40 kA Icu at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 30 kA Icu at 660/690 V AC 50/60 Hz conforming to IEC 60947-2","Network frequency":"50/60 Hz","Relative humidity":"0...95 %","Upside connection":"Front","Device application":"Distribution","Operating altitude":"0...2000 m without derating 2000 m...5000 m with derating","[In] rated current":"1250 A at 50 °C","Downside connection":"Front","Type of measurement":"Ammeter","Overvoltage category":"III","Trip unit technology":"Electronic","Utilisation category":"Category B","Electrical durability":"2000 cycles at 690 V In 3000 cycles at 690 V In/2 4000 cycles at 440 V In 5000 cycles at 440 V In/2","Mechanical durability":"10000 cycles","Breaking capacity code":"N 50 kA 415 V AC","IK degree of protection":"IK07 conforming to EN 50102","IP degree of protection":"IP40 conforming to IEC 60529","Earth-leakage protection":"Without","Product or component type":"Circuit breaker","Suitability for isolation":"Yes conforming to EN/IEC 60947-2","Neutral protection setting":"No protection (3D) 0.5 x Ir (3D + N/2) 1 x Ir (4D)","Protected poles description":"4D","Auxiliary contact composition":"1 NO/NC","[Ui] rated insulation voltage":"800 V AC 50/60 Hz conforming to IEC 60947-2","Trip unit protection functions":"LSI","[Ue] rated operational voltage":"690 V AC 50/60 Hz","Zone selective interlocking ZSI":"With","Electrical shock protection class":"Class II on front face","Ambient air temperature for storage":"-40...85 °C","Ambient air temperature for operation":"-25...70 °C","[Ics] rated service breaking capacity":"50 kA at 220/240 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 380/415 V AC 50/60 Hz conforming to IEC 60947-2 50 kA at 440 V AC 50/60 Hz conforming to IEC 60947-2 40 kA at 500/525 V AC 50/60 Hz conforming to IEC 60947-2 30 kA at 660/690 V AC 50/60 Hz conforming to IEC 60947-2","[Tr] Long-Time Delay Adjustment Range":"12.5...600 s at 1.5 x Ir 0.5...24 s at 6 x Ir 0.7...16.6 s at 7.2 x Ir","[Uimp] rated impulse withstand voltage":"8 kV conforming to IEC 60947-2","[Tsd] Short-Time Delay Adjustment Range":"0.1...0.4 s I²t=on 0...0.4 s I²t=off","[Icw] rated short-time withstand current":"19.2 kA 1 s conforming to IEC 60947-2","Long-time protection delay adjustment type tr":"Adjustable 9 settings","Short-time protection delay adjustment type tsd":"Adjustable","Short-time protection pick-up adjustment type Isd":"Adjustable 9 settings","[Ir] long-time protection pick-up adjustment range":"0.4...1 x In","Instantaneous protection pick-up adjustment type Ii":"Adjustable","[Isd] Short-time protection pick-up adjustment range":"1.5...10 x Ir","[Ii] instantaneous protection pick-up adjustment range":"Off 2...15 x In","Long-time pick-up adjustment type Ir (thermal protection)":"Adjustable 9 settings"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/22cd1764c43289f0095072b88f5d85b1.pdf","sourceUrl":"https://www.se.com/ie/en/product/C125N45AFM/circuit-breaker-compact-ns1250n-50ka-at-415vac-4p-fixed-manually-operated-micrologic-5-0a-control-unit-1250a/"},"ai":{"faq":[{"question":"What is C125N45AFM's breaking capacity at 415 V?","answer":"50 kA Icu at 380/415 V AC 50/60 Hz, conforming to IEC 60947-2. This is the N breaking capacity code, suitable for most 400 V industrial distribution boards."},{"question":"What trip unit does C125N45AFM use?","answer":"It uses a MicroLogic 5.0 A electronic trip unit with LSI protection (long-time, short-time, instantaneous). It includes an ammeter and LCD display for local current reading."},{"question":"What standards does C125N45AFM comply with?","answer":"It complies with EN/IEC 60947-2 for low-voltage switchgear and controlgear. Pollution degree 3 per IEC 60947, overvoltage category III, and IP40 / IK07 protection."},{"question":"Where can I buy C125N45AFM and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm commercial offer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C125N45AFM","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/C125N45AFM 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}}