{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"C125N35EFM","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"C125N35EFM","canonicalUrl":"https://aoctrl.com/schneider/C125N35EFM","factsUrl":"https://aoctrl.com/api/mcp/products/C125N35EFM","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric ComPacT NS new generation, C125N35EFM, 3P, 1250 A, MicroLogic 5.0 E electronic trip unit, 50 kA Icu at 415 V AC, fixed mount, front connections.","salesMarkdown":"The Schneider Electric C125N35EFM is a ComPacT NS new generation molded case circuit breaker (MCCB) from the NS630b...1600 range, rated 1250 A at 50 °C with a MicroLogic 5.0 E electronic trip unit. It is a manually operated, 3-pole device built for distribution applications on AC networks at 50/60 Hz. The 5.0 E trip unit provides LSI protection — long-time overload, short-time short-circuit, and instantaneous short-circuit — plus integrated energy metering via the LCD display. The 1250 A frame and trip rating at 50 °C sets the continuous current capacity; above 50 °C the breaker must be derated per IEC 60947-2. For selectivity with downstream breakers, the short-time delay (S protection) on the MicroLogic 5.0 E allows coordination up to the Icw rating. The electronic trip unit includes a 20-minute thermal memory, which prevents immediate reclose after a trip on overload by simulating the cooling curve of the protected conductor. Power losses are 44 W at rated current — relevant for enclosure thermal management. Fixed mounting on a backplate, with front connections on both line and load sides. Connection pitch is 70 mm. The breaker measures 327 mm high, 210 mm wide, and 147 mm deep. IP40 enclosure protection (finger-safe) and IK07 impact resistance.","metaTitle":"Schneider Electric C125N35EFM ComPacT NS, 1250 A, 50 kA at 4","metaDescription":"Schneider Electric C125N35EFM ComPacT NS new generation molded case circuit breaker, 1250 A, MicroLogic 5.0 E trip unit, 50 kA at 415 V AC. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Range":"ComPacT","title":"C125N35EFM","Depth (D)":"147 mm","Standards":"EN/IEC 60947-2","Width (W)":"210 mm","Height (H)":"327 mm","description":"Circuit breaker, ComPacT NS1250N, 50kA at 415VAC, 3P, fixed, manually operated, MicroLogic 5.0E 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 E","Number of poles":"3P","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","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":"Energy meter","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","Protected poles description":"3D","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":"$3,016.55","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2c53a59cbd9ee03438d88bf513f691ff.pdf","sourceUrl":"https://www.se.com/au/en/product/C125N35EFM/circuit-breaker-compact-ns1250n-50ka-at-415vac-3p-fixed-manually-operated-micrologic-5-0e-control-unit-1250a/"},"ai":{"faq":[{"question":"What is C125N35EFM's breaking capacity at 415 V?","answer":"The C125N35EFM has a breaking capacity of 50 kA Icu at 380/415 V AC 50/60 Hz conforming to IEC 60947-2."},{"question":"Where can I buy C125N35EFM?","answer":"The C125N35EFM is sourced to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."},{"question":"What protection functions does the MicroLogic 5.0 E trip unit provide?","answer":"The MicroLogic 5.0 E provides LSI protection: long-time overload (L), short-time short-circuit (S), and instantaneous short-circuit (I)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/C125N35EFM","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/C125N35EFM 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}}