{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1112-1AA42-0CH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1112-1AA42-0CH0","canonicalUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0CH0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0CH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1 IEC frame 160, 4-pole switch disconnector SD100, In=125A, undervoltage release 120-127V AC 50/60Hz, 2 auxiliary switches HQ + 1 trip alarm switch HQ, busbar connection, front terminal.","salesMarkdown":"The Siemens SENTRON 3VA1112-1AA42-0CH0 is a 4-pole switch disconnector in the 3VA1 IEC frame 160 platform, rated for 125 A continuous current (Iu) and built without overload or short-circuit protection — it's a disconnect, not a breaker. It lands in a load-isolation or maintenance-disconnect role, typically upstream of a motor starter or downstream of a feeder breaker where the disconnect function is separate from protection. Rated continuous current Iu is 125 A — that's the current the switch can carry continuously in free air without exceeding the temperature rise limits. The rated insulation voltage Ui is 800 V, and the maximum operational voltage hits 690 V AC 50/60 Hz or 600 V DC. For a 4-pole switch, that 600 V DC rating is useful for battery-bank or DC-bus isolation where you need to break both polarities. The short-time withstand is 2 kA for 1 s and 2 kA for 0.5 s — this is the fault current the switch can hold closed for coordination without welding contacts, not a breaking capacity. It's a disconnect, so the fault clearing happens upstream. This variant ships with an undervoltage release (UVR) rated 120–127 V AC 50/60 Hz, plus 2 auxiliary switches HQ and 1 trip alarm switch HQ — that's three CO contacts total. The UVR has no leading contact, so it drops out immediately on voltage loss. The switch also accepts an optional motor drive for remote operation, though it's not included here. The main circuit connects via busbar connection at the front terminals — that's a specific footprint: the busbars land on the front face, not the rear. The 4-pole width at 101.6 mm means it occupies roughly 4 module spaces on a DIN rail if using adapter plates, though the 3VA frame typically mounts on a mounting plate with screws.","metaTitle":"3VA1112-1AA42-0CH0 SENTRON Switch Disconnector, 125A, 4-Pole","metaDescription":"Siemens SENTRON 3VA1112-1AA42-0CH0 switch disconnector, 125 A rated continuous current, 4-pole, with undervoltage release and auxiliary switches. Current lifecycle stage. Available","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":"Yes","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":"2 auxiliary switches + 1 trip alarm switch HQ","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":"3","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=149316&mlfb=3VA1112-1AA42-0CH0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0CH0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA1112-1AA42-0CH0?","answer":"This part is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative — 3VA1112-5EF32-0CA0?","answer":"The 3VA1112-5EF32-0CA0 is a 3-pole molded case circuit breaker with overcurrent protection (TM240 release), not a switch disconnector. It shares the same 125 A frame and UVR option but adds short-circuit and overload protection, making it a different functional class. The 3VA1112-1AA42-0CH0 is a pure disconnect with no protection — they are not drop-in substitutes without rewiring the protection scheme."},{"question":"Does this switch disconnector include overcurrent protection?","answer":"No, it is a switch disconnector without overload or short-circuit protection — it is designed for isolation and switching, not fault clearing. Upstream protection must be provided separately."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0CH0","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/3VA1112-1AA42-0CH0 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}}