{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1112-1AA42-0AF0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1112-1AA42-0AF0","canonicalUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0AF0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0AF0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1 IEC frame 160, 4-pole SD100 switch disconnector, In=125 A, without overload or short-circuit protection, busbar connection, front terminal, 1 auxiliary switch HQ + 1 trip alarm switch HQ.","salesMarkdown":"It is a 4-pole unit with a maximum rated operational voltage of 690 V AC at 50/60 Hz and 600 V DC. This part is configured without overload or short-circuit protection, meaning it functions purely as a disconnect switch for isolation and switching under load, not as a circuit breaker protecting downstream conductors. The 125 A rating on a 4-pole frame means this switch disconnector can handle a full three-phase load plus neutral, sized for motor control centers, distribution panels, or as a main disconnect for a sub-panel. The 3VA1112-1AA42-0AF0 measures 130 mm high, 101.6 mm wide, and 70 mm deep. The 101.6 mm width (4 inches) is the standard 4-pole MCCB footprint for the 3VA1 frame, so it fits existing cutouts and busbar systems designed for that form factor. Front-terminal busbar connection simplifies panel wiring — the main conductors land on the front face, not the rear, which is common for switchboard and panelboard integration. This is standard for indoor panel mounting where the enclosure provides the environmental seal. ## Auxiliary Contacts and Switching Capability The auxiliary switch signals the open/closed position of the main contacts; the trip alarm switch signals when the switch has been tripped (mechanically or electrically). This is useful for remote status monitoring in a PLC or SCADA system — the trip alarm can trigger a maintenance alert without needing to walk the panel. The switch disconnector has a mechanical endurance of 15,000 operating cycles. That is a solid figure for a disconnect used for infrequent isolation (daily or weekly switching), but not for high-cycle applications like a motor starter contactor. For frequent switching, a contactor with higher mechanical life would be the correct choice.","metaTitle":"Siemens 3VA1112-1AA42-0AF0 SENTRON Switch Disconnector, 125","metaDescription":"Siemens 3VA1112-1AA42-0AF0 SENTRON switch disconnector, 125 A rated continuous current, 4-pole, IP40 front. Current lifecycle stage. 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":"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":"No","Communication Function":"No","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","Power loss [W] / maximum":"38 W","Auxiliary contact version":"1 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":"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=525561&mlfb=3VA1112-1AA42-0AF0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0AF0/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between this switch disconnector and the 3VA1110-5ED36-0AC0 molded case circuit breaker?","answer":"The 3VA1112-1AA42-0AF0 is a switch disconnector without overload or short-circuit protection, while the 3VA1110-5ED36-0AC0 is a molded case circuit breaker with a TM210 thermal-magnetic release. The 3VA1110-5ED36-0AC0 is a 3-pole unit rated 100 A at 40 °C with a 25 W power loss, versus the 4-pole 125 A and 38 W power loss of the 3VA1112-1AA42-0AF0. They are not drop-in replacements — the circuit breaker provides protection; the switch disconnector does not."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0AF0","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/3VA1112-1AA42-0AF0 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}}