{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2437-8XF32-1AL2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2437-8XF32-1AL2","canonicalUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1AL2","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2437-8XF32-1AL2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2437-8XF32-1AL2 star-delta contactor assembly, 55 kW at 400 V AC-3, S2 frame, screw-type terminals, supplied with two 3RT2037-1AL20 and one 3RT2035-1AL20 contactors, RS assembly kit 3RA2933-2BB1 included.","salesMarkdown":"## Pre-assembled star-delta starting set — what's in the box The 3RA2437-8XF32-1AL2: This SIRIUS contactor assembly ships as a matched wye-delta starting set: two 3RT2037-1AL20 contactors for the line and delta legs, plus one 3RT2035-1AL20 for the star leg, all wired through the included RS assembly kit 3RA2933-2BB1. ## Panel fit and mounting — screw fixing, not DIN rail Fastens with screws (no DIN-rail clip), so budget for four drilled holes on the subpanel. The 177.5 mm width and 142 mm height fit a standard 600 mm enclosure backpan; the 223 mm depth means the assembly protrudes almost 9 inches from the mounting surface — check clearance to the enclosure door or any busbar behind it. Vibration rated at 18.5g for 5 ms and 11.6g for 10 ms — survives the shock profile of a compressor skid or a railcar-mounted cabinet without the contacts bouncing open. ## Termination and wire sizing Auxiliary and control circuit terminals are screw-type, taking 0.5–2.5 mm² stranded or solid — standard for 24 VDC or 230 VAC control wiring. ## Upstream protection and operating conditions Requires a 125 A gG fuse (NH 3NA, DIAZED 5SB, or NEOZED 5SE) on the supply side — this is the specified short-circuit protection for the assembly, not the motor overload setting. Substance prohibition dated 10/01/2014 — RoHS compliant per the EU directive in effect at that date.","metaTitle":"Siemens 3RA2437-8XF32-1AL2 SIRIUS star-delta contactor","metaDescription":"Siemens SIRIUS star-delta motor starter assembly, 55 kW at 400 V AC-3. Supplied with 3RT2037 and 3RT2035 contactors plus RS kit.","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":"3RA2437-8XF32-1AL2","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, 230 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":"230 V","at 60 Hz rated value":"230 V","Instantaneous Contact":"3","For Main Current Circuit":"screw-type terminals","1 Of The Supplied Contactor":"3RT2037-1AL20","2 Of The Supplied Contactor":"3RT2037-1AL20","3 Of The Supplied Contactor":"3RT2035-1AL20","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/31861017c37ce9a7e303880ebfceafe4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=457644&mlfb=3RA2437-8XF32-1AL2"},"ai":{"faq":[{"question":"What contactors are supplied inside this assembly?","answer":"The set includes two 3RT2037-1AL20 contactors (for line and delta) and one 3RT2035-1AL20 (for star), plus the RS wiring kit 3RA2933-2BB1 that interconnects them for wye-delta starting."},{"question":"What is the depth of this motor starter assembly?","answer":"The depth is 223 mm — measure the enclosure backpan clearance to the door or any rear-mounted components before installing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2437-8XF32-1AL2","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/3RA2437-8XF32-1AL2 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}}