{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2444-8XF32-1AG2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2444-8XF32-1AG2","canonicalUrl":"https://aoctrl.com/siemens/3RA2444-8XF32-1AG2","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2444-8XF32-1AG2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2444-8XF32-1AG2 contactor assembly for star-delta (wye-delta) start, 55 kW at 400 V, 90 kW at 690 V, size S3, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"## What this star-delta assembly delivers The 3RA2444-8XF32-1AG2 is a pre-assembled SIRIUS contactor set for star-delta (wye-delta) motor starting — a common method to reduce inrush current on larger three-phase motors during startup. It includes three contactors: two 3RT2045-1AG20 units for the line and delta legs, and one 3RT2035-1AG20 for the star leg. The operating frequency in AC-3 duty is 1,000 operations per hour maximum — the mechanical life of the contactors is 10,000,000 cycles typical, meaning the switching rate, not wear, sets the duty cycle limit in most applications. ## Panel fit and mounting constraints The assembly occupies 220 mm width, 180 mm height, and 244 mm depth — confirm the enclosure depth and side clearance before laying out the panel. Mounting position is flexible: the unit can be rotated ±180° on a vertical surface and tilted forward or backward by ±22.5°. Clearances around the assembly: 10 mm upwards, 10 mm forwards, 10 mm downwards, 10 mm to the side, and 0 mm backwards — the back face sits flush against the mounting surface. The magnet coil and auxiliary contacts also use screw terminals — no spring-cage option on this variant. ## Thermal environment and protection coordination The assembly is rated for vibration: 10.6 g at 5 ms and 6.3 g at 10 ms under AC conditions — check the mounting rail rigidity if the panel is on a machine subject to shock loads. The required upstream fuse rating for type 2 coordination is 160 A, using gG NH 3NA, DIAZED 5SB, or NEOZED 5SE fuses. This must be reflected in the panel schedule — the fuse clears a bolted fault before the contactor welds. The included RS assembly kit is 3RA2943-2C — this is the wiring and mechanical link between the three contactors. If the kit is damaged or missing, the assembly cannot be field-repaired without the specific Siemens kit. ## Lifecycle and sourcing posture This is a BOM-specified assembly; the three contactors and the RS kit are factory-matched. Substituting individual contactors from a different batch or manufacturer voids the coordination and the type-2 protection rating.","metaTitle":"Siemens 3RA2444-8XF32-1AG2 SIRIUS Star-Delta Starter","metaDescription":"Siemens 3RA2444-8XF32-1AG2 SIRIUS contactor assembly for star-delta starting. Rated 55 kW at 400 V, 90 kW at 690 V.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"244 mm","Width":"220 mm","Height":"180 mm","Product Status":"Active"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1191c61674cafda718b5008fed2fab0b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=722801&mlfb=3RA2444-8XF32-1AG2"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2444-8XF32-1AG2?","answer":"The contactors are UL/CSA listed per the SIRIUS series standards."},{"question":"What fuses are required for type 2 coordination with this starter?","answer":"The required fuse rating is 160 A, using gG NH 3NA, DIAZED 5SB, or NEOZED 5SE fuse types. This ensures the fuse clears a fault before the contactor welds under short-circuit conditions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2444-8XF32-1AG2","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/3RA2444-8XF32-1AG2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}