{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1112-1AA42-0AB0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1112-1AA42-0AB0","canonicalUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0AB0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0AB0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1112-1AA42-0AB0, switch disconnector in MCCB design, IEC frame 160, 4-pole, In=125 A, no overload or short-circuit protection, 2 auxiliary switches HP, busbar connection front terminal.","salesMarkdown":"## What this SENTRON switch disconnector is — and isn't The Siemens 3VA1112-1AA42-0AB0 is a 4-pole switch disconnector in the SENTRON 3VA family, built on the IEC frame 160 platform with a rated continuous current Iu of 125 A. It is explicitly designed as a switch disconnector — not a molded case circuit breaker — meaning it provides no overload protection (no thermal or magnetic trip) and no short-circuit protection. Its job is safe isolation and disconnection under load, not fault interruption. The 4-pole configuration switches three phases and neutral. The 125 A continuous rating (Iu) governs the maximum uninterrupted current the disconnector can carry without exceeding its thermal limits. This is the number that decides conductor sizing and upstream protection coordination — the disconnector itself does not clear faults, so the upstream breaker or fuse must be sized to protect the downstream cable and load. For a switch disconnector used primarily for infrequent isolation (maintenance lockout, process changeover), that's a long service life; for daily switching duty, consider a contactor or load-break switch instead. Power loss is 38 W maximum at rated current. The IP40 front-face protection covers the operator interface. Dimensions are 70 mm deep, 101.6 mm wide, and 130 mm tall — the 101.6 mm width (4-inch nominal) is the 4-pole frame width on the SENTRON 3VA platform. The main current circuit connects via busbar connection at the front terminal, which means it's designed for horizontal busbar systems or pre-fabricated distribution bus. No box terminals on this variant; the busbar connection is fixed. The auxiliary contacts are wired via the front terminal block. Optional motor drive can be added via the product extension slot.","metaTitle":"Siemens 3VA1112-1AA42-0AB0 SENTRON Switch Disconnector, 125","metaDescription":"Siemens 3VA1112-1AA42-0AB0 SENTRON switch disconnector, 125 A rated continuous current, 4-pole, IEC frame 160. No overload or short-circuit protection. Sourced to order against RFQ","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":"No","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"38 W","Auxiliary contact version":"2 auxiliary switches HP","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":"Without auxiliary release","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":"2","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=256062&mlfb=3VA1112-1AA42-0AB0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0AB0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0AB0","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/3VA1112-1AA42-0AB0 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}}