{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2437-8XF32-1NB3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2437-8XF32-1NB3","canonicalUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1NB3","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2437-8XF32-1NB3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2437-8XF32-1NB3 star-delta contactor assembly, 55 kW at 400 V AC-3, size S2, screw terminals, with varistor surge suppression.","salesMarkdown":"## Star-delta contactor assembly, 55 kW at 400 V The Siemens 3RA2437-8XF32-1NB3 is a factory-assembled star-delta (wye-delta) starter from the SIRIUS family, built around three contactors: two 3RT2037-1NB30 units for the line and star legs, and one 3RT2035-1NB30 for the delta leg. The kit ships complete with the RS assembly kit 3RA2933-2BB1 and a varistor surge suppressor across the coil — no separate surge suppressor to order. ## What ships in the carton The assembly includes three screw-type contactors (two 3RT2037-1NB30, one 3RT2035-1NB30), the RS assembly kit, and a varistor surge suppressor — all mounted on a common baseplate with screw fixing. No auxiliary switch or bus communication module is included — the product extension for auxiliary switch and bus communication are both listed as 'No'. ## Mounting and panel fit The assembly measures 177.5 mm wide by 142 mm tall by 223 mm deep, with screw fixing to the mounting surface. ## Duty ratings and coordination For Type 2 coordination, the required upstream fuses are gG NH 3NA, DIAZED 5SB, or NEOZED 5SE rated 125 A.","metaTitle":"Siemens 3RA2437-8XF32-1NB3 SIRIUS Star-Delta Starter, 55 kW","metaDescription":"Siemens 3RA2437-8XF32-1NB3 SIRIUS star-delta contactor assembly, 55 kW at 400 V AC-3, size S2. Current production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"223 mm","Solid":"2x (1 ... 35 mm²), 1x (1 ... 50 mm²)","Width":"177.5 mm","at AC":"12g / 5 ms, 7g / 10 ms","at DC":"20 ... 33 V","title":"3RA2437-8XF32-1NB3","Height":"142 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.36","at 60 Hz":"0.39","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,24-33 V AC/DC 3-pole, size S2 screw terminals electrical and mechanical interlock 3 NO + 3 NC integrated","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-3 maximum":"700 1/h","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw fixing","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":"S2","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","Instantaneous Contact":"3","For Main Current Circuit":"screw-type terminals","1 Of The Supplied Contactor":"3RT2037-1NB30","2 Of The Supplied Contactor":"3RT2037-1NB30","3 Of The Supplied Contactor":"3RT2035-1NB30","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2014","Design Of The Surge Suppressor":"with varistor","of the supplied RS assembly kit":"3RA2933-2BB1","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: 125 A","closing power of magnet coil at DC":"28 W","holding power of magnet coil at DC":"4 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 %","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/e5d82547a939694286462a44331a91f2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=435872&mlfb=3RA2437-8XF32-1NB3"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1NB3","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/3RA2437-8XF32-1NB3 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}}