{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"LV839303","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"LV839303","canonicalUrl":"https://aoctrl.com/schneider/LV839303","factsUrl":"https://aoctrl.com/api/mcp/products/LV839303","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric MasterPact MTZ3, LV839303, UL 489 circuit breaker, 4000 A rated, 3-pole, drawout mount, L breaking capacity, 600 VAC, without Micrologic trip unit, with ArcBlok.","salesMarkdown":"## What this 4000 A drawout breaker is for The Schneider Electric LV839303 is a MasterPact MTZ3 3-pole drawout circuit breaker rated 4000 A at 40 °C, with L breaking capacity. It carries UL 489 listing for 200 kA Icu at 240 V AC, 150 kA Icu at 480 V AC, and 100 kA Icu at 600 V AC — so it handles high-fault service-entrance and main-tie applications where SCCR headroom matters. The drawout cradle lets you rack the breaker out for maintenance without disturbing line and load connections, standard for switchgear lineups. ## Breaking performance and coordination Rated short-time withstand current (Icw) is 100 kA for 0.5 s per UL 489, which supports selective coordination downstream — the breaker rides through a fault long enough for a branch device to clear. Maximum breaking time is 9 ms, and the integral instant protection range is 153 to 187 kA. The L breaking capacity code means this frame is optimized for high interrupting duty in the 600 V class. Drawout mounting on base plate rails, with a connection pitch of 9.06 in (230 mm). Overall dimensions: width 31.07 in (789.1 mm), depth 16.8 in (426.8 mm), height 18.8 in (478.1 mm). These are the envelope dimensions for the drawout cradle — verify switchgear cell cutout against the Schneider MTZ3 mounting template before specifying. This order code ships without a Micrologic trip unit — the LV839303 is the bare frame with ArcBlok arc-extinction technology. The trip unit (Micrologic 2.0, 5.0, 6.0, or 7.0 series) must be ordered separately and field-installed. This lets you match the protection curve (LSI, LSIG, or advanced metering) to the load without buying a fixed-configuration breaker.","metaTitle":"Schneider Electric LV839303 MasterPact MTZ3, 4000 A, 3P, Dra","metaDescription":"Schneider Electric LV839303 MasterPact MTZ3 circuit breaker, 4000 A, 3-pole, drawout mount, L breaking capacity, 600 VAC, UL 489. Active production, sourced to order. Request quote","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Air Circuit Breakers"],"specifications":{"Depth":"16.8 in (426.8 mm)","Width":"31.07 in (789.1 mm)","title":"LV839303","Height":"18.8 in (478.1 mm)","description":"Circuit breaker, MasterPacT MTZ3, UL 489, max 4000A rated, 3 pole, drawout mount, L breaking cap, 600VAC, w/o Micrologic trip unit, w/ ArcBlok","Control Type":"Push-button","Network type":"AC","Product name":"MasterPact MTZ3","Mounting Mode":"Drawout","lifecycle_stage":"current","Connection pitch":"9.06 in (230 mm)","Mounting Support":"Base plate Rails","Device short name":"MTZ3 40 L","Network Frequency":"50/60 Hz","Performance Level":"200 kA Icu 240 V AC 50/60 Hz UL 489 150 kA Icu 480 V AC 50/60 Hz UL 489 100 kA Icu 600 V AC 50/60 Hz UL 489","Poles description":"3P","Device Application":"Protection","Line Rated Current":"4000 A 104 °F (40 °C)","Electrical durability":"1000 cycles ANSI C37.50","Maximum breaking time":"9 ms","Mechanical durability":"5000 cycles ANSI C37.50","Nbr. of units in pkg.":"1","Breaking capacity code":"L","Circuit breaker CT rating":"4000 A","Product or Component Type":"Circuit breaker","Integral instant protection":"153...187 kA","Maximum closing response time":"70 ms","Rated breaking and making capacity":"90 kA","[Icw] rated short-time withstand current":"100 kA 0.5 s UL 489"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/dce1318fb1ca57dc3a8c2b1b5d6315d4.pdf","sourceUrl":"https://www.se.com/us/en/product/LV839303/circuit-breaker-masterpact-mtz3-ul-489-max-4000a-rated-3-pole-drawout-mount-l-breaking-cap-600vac-w-o-micrologic-trip-unit-w-arcblok/"},"ai":{"faq":[{"question":"Where can I buy LV839303 and get a price?","answer":"The LV839303 is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote with lead time."},{"question":"What are the key ratings for LV839303?","answer":"Rated 4000 A at 40 °C, 3-pole, 600 VAC, with UL 489 interrupting ratings of 200 kA Icu at 240 V, 150 kA at 480 V, and 100 kA at 600 V. Short-time withstand current is 100 kA for 0.5 s. Maximum breaking time is 9 ms."},{"question":"Does LV839303 include a trip unit?","answer":"No, this order code is the bare MasterPact MTZ3 frame with ArcBlok, without a Micrologic trip unit. The trip unit must be ordered separately and installed in the field."},{"question":"What compliance documentation is available for LV839303?","answer":"The breaker carries UL 489 listing for the interrupting ratings stated. Schneider Electric provides a Declaration of Performance and compliance documentation upon request. RoHS and REACH status can be confirmed from Schneider's product environmental profile for the MasterPact MTZ3 series."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/LV839303","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/LV839303 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}}