{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LV839058","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LV839058","canonicalUrl":"https://aoctrl.com/schneider/LV839058","factsUrl":"https://aoctrl.com/api/mcp/products/LV839058","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Masterpact MTZ3 40 HF, LV839058, automatic switch disconnector, 4000 A, 4P, fixed mounting, 100 kA Icu at 254 V AC.","salesMarkdown":"The LV839058 is a Masterpact MTZ3 40 HF automatic switch disconnector rated 4000 A at 104 °F (40 °C) — that is the continuous current it carries without derating, so for a 4000 A bus or feeder this is the frame size. The 100 kA Icu at 254 V AC (with external relay, per ANSI C37.50) tells you it can interrupt a fault up to that level without failing; the 85 kA Icw for 1.5 s is the short-time withstand, which governs selectivity coordination with downstream breakers. Four poles, fixed mount, push-button control. This is a distribution-class device, not a motor-protection breaker — it goes on the main or tie bus. Fixed mounting means the breaker bolts directly to a mounting plate or bus structure — no draw-out cradle. The 39.2 in (996.3 mm) width and 13.9 in (352.2 mm) height define the cutout and clearance envelope; depth is 11.7 in (297.1 mm) including the push-button operator. Connection pitch is 9.06 in (230 mm) between phase centers, which matches standard bus-bar spacing for 4000 A switchgear. Plan for front-access cable or bus connections; the fixed chassis does not slide out for maintenance.","metaTitle":"LV839058 Masterpact MTZ3 40 HF Switch Disconnector, 4000 A","metaDescription":"Active-production LV839058 Masterpact MTZ3 40 HF automatic switch disconnector. 4000 A rated, 100 kA breaking capacity at 254 V AC. 4P fixed mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Air Circuit Breakers"],"specifications":{"Depth":"11.7 in (297.1 mm)","Width":"39.2 in (996.3 mm)","title":"LV839058","Height":"13.9 in (352.2 mm)","description":"Automatic, switch disconnector, Masterpact MTZ3, 40 HF, 4000A, ANSI, 4P, fixed","Control Type":"Push-button","Network type":"AC","Mounting Mode":"Fixed","lifecycle_stage":"current","Connection pitch":"9.06 in (230 mm)","Breaking capacity":"100.0 kA Icu 254 V AC 50/60 Hz with external relay ANSI C37.50 100.0 kA Icu 508 V AC 50/60 Hz with external relay ANSI C37.50 85.0 kA Icu 635 V AC 50/60 Hz with external relay ANSI C37.50","Device short name":"MTZ3 40 HF","Network Frequency":"50/60 Hz","Poles description":"4P","Device Application":"Distribution","Nbr. of units in pkg.":"1","Product or Component Type":"Switch disconnector","[Ie] rated operational current":"4000 A 104 °F (40 °C)","[Icw] rated short-time withstand current":"85.0 kA 1.5 s ANSI C37.50"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c43871cfd31495d2bd4660e6fac327d2.pdf","sourceUrl":"https://www.se.com/ca/en/product/LV839058/automatic-switch-disconnector-masterpact-mtz3-40-hf-4000a-ansi-4p-fixed/"},"ai":{"faq":[{"question":"What is the breaking capacity of LV839058?","answer":"100 kA Icu at 254 V AC and 508 V AC, and 85 kA Icu at 635 V AC, all with external relay per ANSI C37.50. The short-time withstand is 85 kA for 1.5 s."},{"question":"Where can I buy LV839058?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — no stock count or price published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LV839058","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/LV839058 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}}