{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA1112-1AA42-0BC0","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA1112-1AA42-0BC0","canonicalUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0BC0","factsUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0BC0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA1112-1AA42-0BC0 switch disconnector, IEC frame 160, 4-pole, 125 A, in MCCB design with undervoltage release 24 V DC and 2 HQ auxiliary switches.","salesMarkdown":"That 125 A holds steady at 40 °C, 50 °C, even 70 °C, so it's sized for a warm enclosure or a high-ambient panel without having to oversize the frame. Four poles, rated insulation voltage 800 V, and it handles AC up to 690 V or DC up to 600 V. The front terminals accept busbar connection, and the IP40 front face keeps dust and accidental contact out of the live compartment. The busbar connection on the main circuit and front terminals mean you land the bus bars from the front, which simplifies bus stacking in a distribution section. It ships with two factory-installed HQ auxiliary switches (form C) and an undervoltage release (UVR) coil for 24 V DC. The UVR drops the switch on loss of control voltage — standard for emergency-off or undervoltage protection schemes. No communication module inside; this is a pure disconnect, not a smart breaker. Power loss runs 38 W maximum at rated load — worth accounting for in enclosure thermal calculations if you're packing several of these in a small cabinet. Mechanical service life is 15,000 operating cycles typical, so it's built for occasional switching, not continuous motor-start duty. The 3VA1112-1AA42-0BC0 is a switch disconnector, not a circuit breaker — it has no overload or short-circuit protection. The \"SD100\" in the description confirms it's a disconnect-only variant. If you need integrated protection, you'd step up to the 3VA1 MCCB with a trip unit. This part is for isolation and switching under load, with the UVR providing the only automatic trip on loss of control voltage.","metaTitle":"Siemens 3VA1112-1AA42-0BC0 SENTRON Switch Disconnector, 125","metaDescription":"Siemens 3VA1112-1AA42-0BC0 SENTRON switch disconnector in MCCB design. 125 A continuous, 4-pole, IP40 front. Undervoltage release 24 V DC, 2 HQ aux switches. Current lifecycle stag","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","at 40 °C":"125 A","at 45 °C":"125 A","at 50 °C":"125 A","at 55 °C":"125 A","at 60 °C":"125 A","at 65 °C":"125 A","at 70 °C":"125 A","Trip Indicator":"No","Number Of Poles":"4","Voltage Trigger":"No","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Switch disconnector","Undervoltage Release":"Yes","Design Of The Product":"in MCCB design","During Storage / Maximum":"80 °C","During Storage / Minimum":"-40 °C","power loss [W] / maximum":"38 W","During Operation / Maximum":"70 °C","During Operation / Minimum":"-25 °C","Design Of The Auxiliary Switch":"2 auxiliary switches HQ","Design Of The Auxiliary Release":"Undervoltage release (UVR)","Insulation Voltage / Rated Value":"800 V","protection class IP / on the front":"IP40","operating voltage / at AC / rated value":"690 V","operating voltage / at DC / rated value":"600 V","Product Function / Communication Function":"No","Undervoltage Release With Leading Contact":"No","reference code / according to IEC 81346-2":"Q","Product Extension / Optional / Motor Drive":"Yes","number of CO contacts / for auxiliary contacts":"2","Mechanical Service Life (Operating Cycles) / Typical":"15 000","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=191538&mlfb=3VA1112-1AA42-0BC0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA1112-1AA42-0BC0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA1112-1AA42-0BC0","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/3VA1112-1AA42-0BC0 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}}