{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LV846551","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LV846551","canonicalUrl":"https://aoctrl.com/schneider/LV846551","factsUrl":"https://aoctrl.com/api/mcp/products/LV846551","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric MasterPact MTZ2, fixed circuit breaker, 4P, 1000 A at 40 °C, H10 50 kA at 1150 V AC, rear connections, push-button control.","salesMarkdown":"## MasterPact MTZ2 — the 1000 A fixed breaker for main switchboard duty The Schneider Electric LV846551 is a MasterPact MTZ2 fixed circuit breaker, 4 poles, rated 1000 A at 40 °C. It carries an H10 performance class: 50 kA rated service breaking capacity (Ics) at 1150 V AC 50/60 Hz, with a rated short-circuit making capacity (Icm) of 105 kA at the same voltage. That 50 kA Ics at 1150 V means it clears a fault at full rated voltage without needing to trip upstream — the breaker itself handles the interruption, so downstream coordination holds. This is a Category B breaker, which means it is designed for selectivity in distribution — it withstands a short-time current (Icw) of 50 kA for up to 3 seconds, allowing downstream devices to clear a fault first before this unit trips. That 3-second withstand window is what makes selective coordination practical in a main or tie breaker position. Mounting is fixed on rails or a base plate, with rear connections both upside and downside — typical for switchboard builders who want bus-bar stabs rather than cable lugs. The 115 mm connection pitch matches standard MasterPact MTZ bus-bar spacing. Rated operational voltage (Ue) is 1150 V AC 50/60 Hz, with an insulation voltage (Ui) of 1250 V AC and impulse withstand (Uimp) of 12 kV. If the switchboard ambient runs hotter (say 50 °C), expect a derating curve — typical MasterPact MTZ2 guidance is to reduce by about 1% per degree above 40 °C. The sensor rating range of 400 A, 630 A, 800 A, and 1000 A means the breaker can be re-rated by swapping the electronic trip unit sensor, not the entire frame. Mechanical durability is 25,000 cycles with periodic preventive maintenance; electrical durability is 500 cycles at 1150 V AC. For a main breaker that operates a few times a year, that electrical endurance is effectively life-of-installation. For a breaker that sees frequent switching (e.g., capacitor bank or generator coupling), the 500-cycle figure is a real limit — plan for a contact inspection or replacement at that interval. ## Lifecycle and sourcing — active, but plan ahead For a critical-spare holding or a new switchboard project, it is worth getting a quote locked in early — the 1000 A H10 variant is a common spec, but lead times can stretch when global demand for MTZ2 frames is high. ## Physical integration — what fits where IP30 protection is standard for enclosed switchgear. Altitude derating starts above 2000 m. The neutral position is left — important when phasing bus-bar runs in a 4-pole switchboard. Control is via push-button and the breaker ships without a control unit, meaning the electronic trip unit (Micrologic X or similar) is ordered separately. Factor that into your BOM: the LV846551 is the frame and mechanism only.","metaTitle":"Schneider Electric LV846551 MasterPact MTZ2, 1000 A, 4P, H10","metaDescription":"Schneider Electric LV846551 MasterPact MTZ2 circuit breaker, 1000 A at 40 °C, 4 poles, H10 performance (50 kA at 1150 V AC). Category B selectivity. Fixed mount, rear connections.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Air Circuit Breakers"],"specifications":{"Depth":"300 mm","Range":"MasterPacT","Width":"537 mm","title":"LV846551","Height":"352 mm","Standards":"EN/IEC 60947-1 EN/IEC 60947-2 EN/IEC 60947-2 Annex H IEC 61557-12","description":"Circuit breaker frame, MasterPact MTZ2 10H10 fixed for MicroLogic X, 1000A, 50kA/1150VAC (Icu), 4P","Control type":"Push-button","Control unit":"Without control unit","Product name":"MasterPact MTZ2","Mounting mode":"Fixed","Sensor rating":"400 A 630 A 800 A 1000 A","lifecycle_stage":"current","Connection pitch":"115 mm","Mounting support":"Rails Base plate","Neutral position":"Left","Performance type":"H10 50 kA 1150 V AC","Pollution degree":"3 conforming to IEC 60947-1","Device short name":"MTZ2 10 H10","Poles description":"4P","Upside connection":"Rear","Device application":"Power distribution protection","Operating altitude":"0...2000 m without derating 2000...5000 m with derating","[In] rated current":"1000 A at 40 °C","Downside connection":"Rear","Selectivity category":"Category B","Electrical durability":"500 cycles 1150 V AC 50/60 Hz conforming to EN/IEC 60947-2","Maximum breaking time":"25 ms","Mechanical durability":"25000 cycles with periodic preventive maintenance","Power dissipation in W":"70 W","IP degree of protection":"IP30 conforming to EN 60529","Product or component type":"Circuit breaker","Suitability for isolation":"Yes conforming to EN/IEC 60947-2","Maximum closing response time":"70 ms","[Ui] rated insulation voltage":"1250 V AC 50/60 Hz","[Ue] rated operational voltage":"1150 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":"50 kA at 1150 V AC 50/60 Hz","[Uimp] rated impulse withstand voltage":"12 kV","[Icw] rated short-time withstand current":"50 kA 1 s 50 kA 0.5 s 50 kA 3 s","[Icm] rated short-circuit making capacity":"105 kA 1150 V AC at 50/60 Hz","[Icu] rated ultimate short-circuit breaking capacity":"50 kA at 1150 V AC 50/60 Hz"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$13,755.05","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/42d5c7906d5be41b73f2a8babb95ba29.pdf","sourceUrl":"https://www.se.com/ie/en/product/LV846551/circuit-breaker-frame-masterpact-mtz2-10h10-fixed-for-micrologic-x-1000a-50ka-1150vac-icu-4p/"},"ai":{"faq":[{"question":"How do I get current pricing and availability for LV846551?","answer":"The LV846551 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote and lead-time estimate."},{"question":"What compliance documentation does LV846551 carry?","answer":"The LV846551 is designed and certified to EN/IEC 60947-1, EN/IEC 60947-2, EN/IEC 60947-2 Annex H, and IEC 61557-12. It is suitable for isolation per EN/IEC 60947-2."},{"question":"Does LV846551 include the trip unit?","answer":"No, the LV846551 ships without a control unit — it is the frame and mechanism only. The electronic trip unit (Micrologic X series) must be ordered separately."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LV846551","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/LV846551 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}