{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2445-8XE32-1NB3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2445-8XE32-1NB3","canonicalUrl":"https://aoctrl.com/siemens/3RA2445-8XE32-1NB3","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2445-8XE32-1NB3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2445-8XE32-1NB3 contactor assembly for star-delta (wye-delta) start, 75 kW at 400 V, 110 kW at 690 V, Size S3, screw-type terminals, with varistor surge suppression.","salesMarkdown":"## Star-delta contactor assembly — what ships in the box The 3RA2445-8XE32-1NB3: This is a pre-assembled SIRIUS star-delta starter, not a bare contactor. The package includes three contactors: two 3RT2045-1NB30 units (one with the -0CC0 variant that includes a varistor surge suppressor) and one 3RT2036-1NB30, plus the 3RA2943-2C RS assembly kit. The varistor across the coil suppresses voltage spikes during de-energisation — saves adding a separate suppressor at the panel level. ## Power ratings and duty — what 75 kW at 400 V means on the line The maximum operating voltage is 690 V AC-3. These are the numbers that govern the motor FLC it can handle — the 75 kW figure at 400 V is the one most panel builders will size against for a 400 V distribution system. The magnet coil pulls 154 W closing power at DC, with a control voltage range of 20 to 33 V DC. Coil terminals are screw-type, same as the main and auxiliary circuits — consistent termination throughout, no mix of spring and screw. Mechanical life is rated at 10 million operating cycles typical for the contactor. The maximum switching rate in AC-3 is 1,000 operations per hour — relevant if this starter is cycling a load that fast (most pump/fan applications run far below that). ## Mounting and panel fit — DIN rail or screw, with rotation flexibility Mounts on 35 mm DIN rail via the snap-on feature, or can be screw-fastened. This matters when the panel layout forces an odd orientation — most contactors lock you into one plane. Dimensions are 180 mm high, 220 mm wide, 244 mm deep. The depth is the dimension that sticks out from the DIN rail — at 244 mm, check your enclosure depth before committing. Clearance requirements: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards (sits flush against the mounting surface).","metaTitle":"Siemens 3RA2445-8XE32-1NB3 SIRIUS Star-Delta Starter","metaDescription":"Siemens SIRIUS 3RA2445-8XE32-1NB3 star-delta contactor assembly, 75 kW at 400 V AC-3, 110 kW at 690 V. Screw terminals, varistor surge suppression.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","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":"3RA2445-8XE32-1NB3","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":"star-delta (wye-delta) combination with IO-Link, AC-3, 75 kW/400 V 20-33 V AC/DC Size S3, screw terminal electrical and mechanical interlock 3 NO+3 NC, varistor integrated","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":"3RT2045-1NB30-0CC0","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","for 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":"0","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","Of The Supplied Function Module For Communication":"3RA2711-1CA00","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"Yes","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/1b4d1d9617c647d8822841c52c056f71.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=629718&mlfb=3RA2445-8XE32-1NB3"},"ai":{"faq":[{"question":"What is 3RA2445-8XE32-1NB3 used for?","answer":"It is a pre-assembled contactor assembly for star-delta (wye-delta) starting of three-phase motors. It includes three contactors and the interconnecting RS kit, reducing panel wiring time compared to sourcing individual components."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2445-8XE32-1NB3","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/3RA2445-8XE32-1NB3 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-21T00:35:33.297Z","lastPublished":"2026-07-21T00:35:33.297Z","indexable":true}}