{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA1125-0JA23-1BW4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA1125-0JA23-1BW4","canonicalUrl":"https://aoctrl.com/siemens/3RA1125-0JA23-1BW4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA1125-0JA23-1BW4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA1125-0JA23-1BW4, combination starter nonreversing, DIN/panel mount, IEC, frame size S0, 0.7-1 A, 48 VDC control voltage, MSP aux-1 SPDT NO/NC contactor aux-1 NO front mount, UL File E156943.","salesMarkdown":"## What this combination starter delivers The Siemens 3RA1125-0JA23-1BW4 is a nonreversing combination starter from the SIRIUS S0 frame series, rated for 0.7-1 A with a 48 VDC control voltage. It integrates a motor starter protector (MSP) and a contactor in one DIN-rail or panel-mount package, saving panel space and wiring time on IEC motor control circuits. The auxiliary side carries one SPDT NO/NC contact on the MSP plus one NO front-mounted auxiliary contact on the contactor — enough for a feedback signal and a status lamp without adding a separate aux block. ## UL recognition and approvals The 3RA1125-0JA23-1BW4 holds UL File E156943 in Volume 1, Section 14, confirming its listing for the US and Canadian markets. That file covers the combination starter assembly, so the entire unit — MSP and contactor — is UL-recognized as a single component, simplifying panel certification for UL 508A shops. ## Control voltage and auxiliary contact configuration The 48 VDC control coil is fixed — this is a DC-rated solenoid, not an AC coil with a rectifier. If your panel runs 24 VDC control, this part will not pick; you would need the 24 VDC variant of the same S0 frame starter. The MSP auxiliary provides one SPDT (NO/NC) contact, and the contactor adds one NO front-mounted auxiliary — two isolated signal paths total, both rated for the same switching duty as the main contactor.","metaTitle":"Siemens 3RA1125-0JA23-1BW4 Combination Starter, 0.7-1 A","metaDescription":"Siemens 3RA1125-0JA23-1BW4 combination starter, nonreversing, SIRIUS S0 frame, 0.7-1 A, 48 VDC control. Current lifecycle stage. UL recognized.","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=320977&mlfb=3RA1125-0JA23-1BW4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RA1125-0JA23-1BW4/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RA1125-0JA23-1BW4 available via RFQ confirmation?","answer":"The 3RA1125-0JA23-1BW4 is sourced to order against an RFQ through independent distribution. Submit a request for current availability and pricing; stock and lead time are confirmed at quote time."},{"question":"What are the auxiliary contacts on 3RA1125-0JA23-1BW4?","answer":"The MSP supplies one SPDT (NO/NC) auxiliary contact, and the contactor adds one NO front-mounted auxiliary contact — two isolated signal paths total."},{"question":"Is 3RA1125-0JA23-1BW4 UL recognized?","answer":"Yes, it is listed under UL File E156943 in Volume 1, Section 14, covering the combination starter assembly for US and Canadian markets."},{"question":"Can 3RA1125-0JA23-1BW4 be used with 24 VDC control voltage?","answer":"No, the control coil is rated for 48 VDC only. A 24 VDC variant of the same S0 frame starter would be required for a 24 VDC control bus."},{"question":"Is 3RA1125-0JA23-1BW4 a direct replacement for 3RA1125-0JA23-1BW3?","answer":"The evidence does not specify a direct replacement relationship. Verify pinout, control voltage, and auxiliary contact configuration against your current part before ordering."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA1125-0JA23-1BW4","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/3RA1125-0JA23-1BW4 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}}