{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA1125-1KA25-1AC2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA1125-1KA25-1AC2","canonicalUrl":"https://aoctrl.com/siemens/3RA1125-1KA25-1AC2","factsUrl":"https://aoctrl.com/api/mcp/products/3RA1125-1KA25-1AC2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, combination starter nonreversing, DIN/panel mount, frame size S0, 9 - 12.5A, 208VAC control voltage, MSP aux SPDT NO/NC, contactor aux NO front mount, UL file E156943.","salesMarkdown":"## What this SIRIUS combination starter covers The Siemens 3RA1125-1KA25-1AC2 is a nonreversing combination starter in the SIRIUS family, frame size S0, rated 9 to 12.5 A with a 208 VAC control voltage. It integrates a motor-starter protector (MSP) with one SPDT NO/NC auxiliary contact plus a contactor with one NO front-mount auxiliary. The DIN-rail or panel-mount form factor simplifies enclosure integration for IEC motor control centers. The 9–12.5 A current range covers IEC motor loads. The 208 VAC control voltage is the coil rating for the contactor and MSP. ## Approvals and standards compliance Listed under UL file E156943 in volume 1 section 14, confirming UL acceptance for North American installations.","metaTitle":"Siemens 3RA1125-1KA25-1AC2 Combination Starter, 12.5A 208VAC","metaDescription":"Siemens 3RA1125-1KA25-1AC2 SIRIUS combination starter, nonreversing, 9-12.5A, 208VAC control voltage, S0 frame. Current lifecycle stage.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"lifecycle_stage":"current"}},"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=103915&mlfb=3RA1125-1KA25-1AC2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA1125-1KA25-1AC2/alternatives.json"},"ai":{"faq":[{"question":"Is 3RA1125-1KA25-1AC2 compatible with 208VAC control voltage?","answer":"Yes — the control voltage is specified as 208 VAC, matching the coil rating of the MSP and contactor inside the combination starter."},{"question":"What are the auxiliary contacts on 3RA1125-1KA25-1AC2?","answer":"The MSP carries one SPDT (NO/NC) auxiliary contact, and the contactor adds one normally-open front-mount auxiliary. That gives one changeover signal plus one NO signal for feedback or interlock use."},{"question":"What is the difference between 3RA1125 and 3RA1126?","answer":"The 3RA1125 is a nonreversing combination starter; the 3RA1126 is the reversing version. Both share the S0 frame and similar current ranges, but the 3RA1126 includes a mechanical interlock and two contactors for forward/reverse motor control."},{"question":"Where can I buy 3RA1125-1KA25-1AC2 available via RFQ confirmation?","answer":"This part is sourced to order against an RFQ. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA1125-1KA25-1AC2","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/3RA1125-1KA25-1AC2 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}}