{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2425-8XF32-2BB4-ZA01","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2425-8XF32-2BB4-ZA01","canonicalUrl":"https://aoctrl.com/siemens/3RA2425-8XF32-2BB4-ZA01","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2425-8XF32-2BB4-ZA01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RA2425-8XF32-2BB4-ZA01 contactor assembly, star-delta start AC-3, 15/18.5 kW at 400 V, 24 V DC coil, 3-pole, Size S0, spring-type terminals, electrical and mechanical interlock, 3 NO + 3 NC integrated.","salesMarkdown":"## What this star-delta contactor assembly does The Siemens 3RA2425-8XF32-2BB4-ZA01 is a pre-assembled contactor set for wye-delta (star-delta) motor starting in AC-3 duty. It handles 15 kW (direct-on-line rating) or 18.5 kW when configured for star-delta transition at 400 V, 50/60 Hz. The 24 V DC coil keeps the control circuit separate from the power side — common in PLC-driven panels where the control voltage is isolated from the motor supply. ## Size S0 with spring terminals — what that means on the panel Size S0 is the standard Siemens frame for contactors up to about 18.5 kW at 400 V. The spring-type (cage-clamp) terminals accept solid or ferruled stranded wire without retightening — a time-saver during panel build and a reliability gain under thermal cycling, since screw terminals can loosen over time. The 3 NO + 3 NC auxiliary contacts are integrated into the assembly, so no add-on block is needed for basic feedback or interlocking. ## Electrical and mechanical interlock — why it matters here In a star-delta starter, the main and delta contactors must never close simultaneously — that would short the motor windings through the transition resistors. This assembly includes both an electrical interlock (wired through the auxiliary contacts) and a mechanical interlock (a physical bar between the contactor armatures). The mechanical interlock is the failsafe: even if a weld or control fault holds one contactor closed, the other physically cannot engage.","metaTitle":"Siemens 3RA2425-8XF32-2BB4-ZA01 Motor Starter, 18.5 kW","metaDescription":"Siemens 3RA2425-8XF32-2BB4-ZA01 contactor assembly for star-delta starting, AC-3 rated 18.5 kW at 400 V, 24 V DC coil, Size S0 with spring terminals.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"title":"3RA2425-8XF32-2BB4-ZA01","description":"Contactor assembly for star-delta (wye-delta) start AC-3, 15/18.5 kW/400 V, 24 V DC 3-pole, Size S0 Spring-type terminal electrical and mechanical interlock 3 NO + 3 NC integrated","lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5bc2e49fe47d976685ee39b96d5fc30a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=323856&mlfb=3RA2425-8XF32-2BB4-ZA01"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2425-8XF32-2BB4-ZA01?","answer":"As a standard Siemens industrial control product, this contactor assembly carries CE marking for the European market and is manufactured under ISO 9001. Specific declarations of conformity (CE, UKCA) and material compliance declarations (RoHS, REACH) are available from Siemens Industry Online Support using the order code 3RA2425-8XF32-2BB4-ZA01."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2425-8XF32-2BB4-ZA01","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/3RA2425-8XF32-2BB4-ZA01 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}