{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2437-8XF32-1AG2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2437-8XF32-1AG2","canonicalUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1AG2","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2437-8XF32-1AG2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2437-8XF32-1AG2 star-delta contactor assembly, 55 kW at 400 V AC-3, 690 V max, screw terminals, size S2, 177.5 x 142 x 223 mm.","salesMarkdown":"## Star-delta contactor assembly for 55 kW motors The 3RA2437-8XF32-1AG2: It ships with three contactors: two 3RT2037-1AG20 units and one 3RT2035-1AG20, plus the RS assembly kit 3RA2933-2BB1. All main, auxiliary, and control circuit connections use screw-type terminals, and the contactor size is S2, matching the standard SIRIUS footprint for this power class. ## Mounting, clearances, and environmental limits The assembly measures 177.5 mm wide, 142 mm high, and 223 mm deep. It fastens via screw fixing, not DIN-rail clip, so panel layout must account for drill points. Minimum clearance around the unit: 10 mm upwards, forwards, downwards, and to the side; 0 mm backwards. The assembly withstands vibration at 18.5g / 5 ms and 11.6g / 10 ms under AC excitation. ## Fuse coordination and conductor sizing For type 2 coordination, the required backup fuse is 125 A using gG NH (3NA), DIAZED (5SB), or NEOZED (5SE) types. The main circuit accepts solid conductors: 2x (1 to 35 mm²) and 1x (1 to 50 mm²). Rated switching frequency at AC-3 is 700 operations per hour maximum, with a mechanical life of 10 million operations typical.","metaTitle":"Siemens 3RA2437-8XF32-1AG2 SIRIUS Star-Delta Starter, 55 kW","metaDescription":"Siemens SIRIUS 3RA2437-8XF32-1AG2 star-delta contactor assembly, 55 kW at 400 V, AC-3. Current production. Screw terminals. Sourced 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":"18.5g / 5 ms, 11.6g / 10 ms","title":"3RA2437-8XF32-1AG2","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, 110 V AC 50/60 Hz, 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","at 50 Hz rated value":"110 V","at 60 Hz rated value":"110 V","Instantaneous Contact":"3","For Main Current Circuit":"screw-type terminals","1 Of The Supplied Contactor":"3RT2037-1AG20","2 Of The Supplied Contactor":"3RT2037-1AG20","3 Of The Supplied Contactor":"3RT2035-1AG20","at AC-3 rated value maximum":"690 V","Substance Prohibitance (Date)":"10/01/2014","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","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","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":"$438.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4ce4b23ba6023402a71575f075650f57.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=463503&mlfb=3RA2437-8XF32-1AG2"},"ai":{"faq":[{"question":"What is the depth of 3RA2437-8XF32-1AG2?","answer":"The depth is 223 mm. Combined with the 177.5 mm width and 142 mm height, panel cut-out and enclosure depth must accommodate these dimensions plus the 10 mm forward clearance."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1AG2","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/3RA2437-8XF32-1AG2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}