{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2445-8XF32-1NB3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2445-8XF32-1NB3","canonicalUrl":"https://aoctrl.com/siemens/3RA2445-8XF32-1NB3","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2445-8XF32-1NB3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2445-8XF32-1NB3 contactor assembly for star-delta (wye-delta) start, 75 kW at 400 V, 110 kW at 690 V, Size S3, screw terminals, DIN rail mount.","salesMarkdown":"## Star-delta motor starting, pre-assembled The Siemens 3RA2445-8XF32-1NB3 is a factory-assembled SIRIUS contactor assembly for star-delta (wye-delta) motor starting. It ships with three contactors: two 3RT2045-1NB30 units for the line and star legs, and one 3RT2036-1NB30 for the delta leg, plus the interconnecting RS assembly kit 3RA2943-2C. Rated for 75 kW at 400 V and 110 kW at 690 V in AC-3 duty, this assembly handles the transition from star to delta without the user having to size and wire individual contactors and the timing relay. The built-in varistor surge suppressor snubs coil transients at the DC magnet coil terminals. This gives panel builders room to fit it into tight enclosures without reworking the backplate. Dimensions are 180 mm high, 220 mm wide, and 244 mm deep — the depth is the dimension to watch when fitting into shallow enclosures. Clearance distances around the assembly: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards. The zero backward clearance means it can sit flush against the back panel or a busbar support without additional spacing. ## Duty ratings and protection coordination The assembly is rated for a maximum of 1,000 switching operations per hour in AC-3 duty. Mechanical life is 10 million operations typical for the contactors — the limiting factor in star-delta service is usually the delta contactor's electrical life during the transition, not the mechanical endurance. For branch circuit protection, Siemens specifies gG NH 3NA, DIAZED 5SB, or NEOZED 5SE fuses rated at 160 A. The DC magnet coil draws 154 W closing power at 20 to 33 V DC. Vibration resistance is specified at 10.6 g / 5 ms and 6.3 g / 10 ms for AC, which covers most industrial motor-drive applications including conveyors and pumps. The power factor at 50/60 Hz is 0.95. ## Lifecycle and sourcing Substance prohibitance date is 03/01/2017, confirming RoHS and REACH compliance. No auxiliary switch extension or bus communication module is fitted as standard — the assembly is a standalone star-delta starter with screw-type control terminals.","metaTitle":"Siemens 3RA2445-8XF32-1NB3 SIRIUS Star-Delta Starter","metaDescription":"Siemens 3RA2445-8XF32-1NB3 SIRIUS contactor assembly for star-delta motor starting. Rated 75 kW at 400 V, 110 kW at 690 V. Active production, quoted to order.","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":"3RA2445-8XF32-1NB3","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, 75 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":"75 kW","at 690 V rated value":"110 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":"3RT2036-1NB30","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":"$662.94","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b34e7bfc8dd925c346feaf990dbe1930.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629722&mlfb=3RA2445-8XF32-1NB3"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RA2445-8XF32-1NB3?","answer":"The assembly has a substance prohibitance date of 03/01/2017, confirming RoHS and REACH compliance. Standard Siemens documentation includes the declaration of conformity and the product drawing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2445-8XF32-1NB3","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/3RA2445-8XF32-1NB3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}