{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2444-8XF32-1NB3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2444-8XF32-1NB3","canonicalUrl":"https://aoctrl.com/siemens/3RA2444-8XF32-1NB3","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2444-8XF32-1NB3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2444-8XF32-1NB3 star-delta contactor assembly, Size S3, 55 kW at 400 V AC-3, 90 kW at 690 V AC-3, screw terminals, varistor surge suppression, DIN rail mount.","salesMarkdown":"## Active production, pre-assembled for star-delta duty The 3RA2444-8XF32-1NB3: It ships with two 3RT2045-1NB30 contactors (main and delta legs) and one 3RT2035-1NB30 (star leg), plus the 3RA2943-2C RS assembly kit. The varistor surge suppressor is integrated into the assembly, not an add-on module. ## Motor power and mounting — what fits where Rated 55 kW at 400 V and 90 kW at 690 V in AC-3 duty, this Size S3 assembly handles the star-to-delta transition for motors up to those power levels. Clearance requirements: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards — the back of the assembly can sit flush against the panel backplane. Dimensions are 244 mm deep, 220 mm wide, 180 mm tall — confirm the panel cutout and door clearance before committing the BOM line. ## Termination and compliance details All power and control terminals are screw-type — main circuit, magnet coil, and auxiliary/control circuit. The coil accepts 20–33 V DC with a closing power of 154 W. Auxiliary contacts: 3 instantaneous, no auxiliary switch extension fitted as standard. Substance compliance date is 03/01/2017 — the assembly meets RoHS and REACH requirements as of that date. No UL or CSA listing is recorded in the spec set, so verify with the local Siemens office if the site requires UL 508 listing. Recommended upstream fusing for type of coordination 2: gG NH 3NA, DIAZED 5SB, or NEOZED 5SE at 160 A.","metaTitle":"Siemens 3RA2444-8XF32-1NB3 SIRIUS Star-Delta Starter","metaDescription":"Siemens SIRIUS 3RA2444-8XF32-1NB3 star-delta contactor assembly, 55 kW at 400 V AC-3, 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","at AC":"10.6 g / 5 ms, 6.3 g / 10 ms","at DC":"20 ... 33 V","title":"3RA2444-8XF32-1NB3","Height":"180 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.95","at 60 Hz":"0.95","Backwards":"0 mm","Downwards":"10 mm","At The Side":"10 mm","description":"Contactor assembly for star-delta (wye-delta) start AC-3, 55 kW/400 V 20-33 V AC/DC Size S3, screw terminal electrical and mechanical interlock 3 NO+3 NC, integrated varistor","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-3 maximum":"1 000 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Contactor assembly for star-delta (wye-delta) start","Of Contactor Typical":"10 000 000","at 400 V rated value":"55 kW","at 690 V rated value":"90 kW","Instantaneous Contact":"3","For Main Current Circuit":"screw-type terminals","1 Of The Supplied Contactor":"3RT2045-1NB30","2 Of The Supplied Contactor":"3RT2045-1NB30","3 Of The Supplied Contactor":"3RT2035-1NB30","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"03/01/2017","Design Of The Surge Suppressor":"with varistor","of the supplied RS assembly kit":"3RA2943-2C","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 160 A","closing power of magnet coil at DC":"154 W","holding power of magnet coil at DC":"5.6 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 250 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"< 1 error per 100 million operating cycles","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²), 1x (10 ... 50 mm²)","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC/DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Of The Supplied Function Module For Wye-Delta Circuits":"3RA2816-0EW20","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"No","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9ed1a82ba0792545393d3b2460073099.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=722804&mlfb=3RA2444-8XF32-1NB3"},"ai":{"faq":[{"question":"What is 3RA2444-8XF32-1NB3 used for?","answer":"It is a Siemens SIRIUS star-delta (wye-delta) contactor assembly for starting three-phase induction motors. It handles the transition from star to delta winding configuration, limiting inrush current during start-up. Rated 55 kW at 400 V and 90 kW at 690 V in AC-3 duty."},{"question":"What contactors are supplied inside the 3RA2444-8XF32-1NB3 assembly?","answer":"The assembly includes two 3RT2045-1NB30 contactors (for main and delta legs) and one 3RT2035-1NB30 (star leg), plus the 3RA2943-2C RS assembly kit with integrated varistor surge suppression."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2444-8XF32-1NB3","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/3RA2444-8XF32-1NB3 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}}