{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1112-1AA42-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1112-1AA42-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1 IEC frame 160, switch disconnector, 4-pole SD100, In=125 A, without overload or short-circuit protection, undervoltage release (UVR) 24V DC, front busbar connection, IP40 front.","salesMarkdown":"## Switch disconnector for isolation duty The Siemens 3VA1112-1AA42-0BA0 is a SENTRON 3VA1 switch disconnector in the IEC frame 160 — a 4-pole, 125 A rated continuous current (Iu) device designed for load-break isolation rather than overcurrent protection. It carries no overload or short-circuit release; its job is to safely disconnect a circuit under load, providing visible isolation for maintenance or emergency switching. ## Undervoltage release and control voltage The leading contact is absent, so the UVR does not pre-charge before the main contacts close; sequence logic must come from the external control circuit. The 24 V DC coil is common across panel builds, but verify polarity and free-wheel diode placement if driving from a PLC output or relay. ## Electrical ratings and voltage class Rated insulation voltage (Ui) is 800 V, and maximum operational voltage reaches 690 V AC (50/60 Hz) or 600 V DC. That covers 400/480 V three-phase distribution and most 500–600 V DC bus applications. ## Mounting and connection Front-terminal busbar connection is standard; the 101.6 mm width and 70 mm depth fit the 3VA1 frame footprint. The IP40 front protection means the operator face is protected against solid objects over 1 mm, but the enclosure must provide the overall IP rating.","metaTitle":"Siemens 3VA1112-1AA42-0BA0 SENTRON Switch Disconnector, 125","metaDescription":"Siemens 3VA1112-1AA42-0BA0 SENTRON switch disconnector, 125 A rated continuous current, 4-pole, with undervoltage release 24V DC. IP40 front. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"70 mm","Width":"101.6 mm","Height":"130 mm","Limited To 1 S":"2 kA","Trip indicator":"No","Number of poles":"4","Product version":"in MCCB design","Voltage trigger":"No","lifecycle_stage":"current","Limited To 0.5 S":"2 kA","Product brand name":"SENTRON","Product designation":"Switch disconnector","Latching - endurance":"15 000","Undervoltage Release":"Yes","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"38 W","Auxiliary contact version":"Without","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Rated continuous current Iu":"125 A","Rated insulation voltage Ui":"800 V","Design of the auxiliary release":"Undervoltage release (UVR)","Protection class IP / on the front":"IP40","Reference code / acc. to DIN EN 81346-2":"Q","Max. rated operational voltage Ue with DC":"600 V","Undervoltage Release With Leading Contact":"No","Product extension / optional / motor drive":"Yes","Number of CO contacts / for auxiliary contacts":"0","Max. rated operational voltage Ue with AC 50/60Hz":"690 V","Type of electrical connection / for main current circuit":"busbar connection","Arrangement of electrical connectors / for main current circuit":"Front terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=477185&mlfb=3VA1112-1AA42-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0BA0/alternatives.json"},"ai":{"faq":[{"question":"What is the 3VA1112-1AA42-0BA0 used for?","answer":"It is a 4-pole switch disconnector rated 125 A continuous current, used for load-break isolation in distribution panels or motor circuits where overload and short-circuit protection are handled separately."},{"question":"What are the key ratings of this switch disconnector?","answer":"Rated continuous current Iu is 125 A, rated insulation voltage Ui is 800 V, max operational voltage is 690 V AC or 600 V DC, and maximum power loss is 38 W."},{"question":"Where can I buy the 3VA1112-1AA42-0BA0?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution, with availability and current pricing confirmed at quote time."},{"question":"Does the 3VA1112-1AA42-0BA0 include overcurrent protection?","answer":"No, it is a switch disconnector without overload or short-circuit protection — it provides isolation only, and upstream protective devices must be coordinated separately."},{"question":"What is the difference between this switch disconnector and a molded case circuit breaker like the 3VA1112-5EF32-0CA0?","answer":"The 3VA1112-5EF32-0CA0 is a 3-pole MCCB with a TM240 thermal-magnetic release providing LI protection (overload and short-circuit), while this 3VA1112-1AA42-0BA0 is a 4-pole switch disconnector with no overcurrent release — it cannot clear faults and must be paired with separate protection. The MCCB also has a narrower 76.2 mm width versus 101.6 mm for the 4-pole disconnector, so they are not footprint-interchangeable without panel modification."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0BA0","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3VA1112-1AA42-0BA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}