{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2337-8XB30-1KB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2337-8XB30-1KB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2337-8XB30-1KB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2337-8XB30-1KB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS reversing contactor assembly, S2 size, 30 kW at 400 V AC-3, 65 A at 480 V, 24 V DC coil, screw terminals, DIN rail mount.","salesMarkdown":"The Siemens 3RA2337-8XB30-1KB4 is a SIRIUS reversing contactor assembly — a factory-wired pair of contactors with mechanical interlock, sized S2, that reverses a three-phase motor by swapping two phases. It ships with two 3RT2037-1KB40 contactors already mounted and interlocked, saving panel-build time over ordering and assembling the pair separately. Rated 30 kW at 400 V AC-3 (the standard motor-switching duty class per IEC 60947-4-1), it handles reversing loads up to that power. At 480 V the thermal current rating is 65 A, and at 690 V it still carries 37 kW — useful for 690 V distribution in mining or marine plants. The coil is 24 V DC, screw-type terminals on both the magnet coil and the main power circuit. The S2 frame keeps the footprint compact: 120 mm wide, 141 mm tall, 130 mm deep — fits a standard 600 mm enclosure depth with room for wiring. ## Mounting and clearances — what the panel builder needs That covers most panel layouts where the contactor needs to sit at an angle for wire routing. Clearance to adjacent components: 10 mm upwards, forwards, downwards, and to the side — zero mm backwards (the back is flush to the DIN rail). That 10 mm gap is the minimum for heat dissipation at full rated current; tighter spacing forces derating. Wire sizes: the main power circuit accepts solid conductors from 1 mm² up to 35 mm² (two per terminal) or one up to 50 mm². Screw terminals throughout — no spring-cage on this variant.","metaTitle":"Siemens 3RA2337-8XB30-1KB4 Reversing Contactor","metaDescription":"Siemens SIRIUS reversing contactor assembly 3RA2337-8XB30-1KB4, 30 kW at 400 V AC-3, 65 A at 480 V, 24 V DC coil. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Starters"],"specifications":{"Depth":"130 mm","Solid":"2x (1 ... 35 mm²), 1x (1 ... 50 mm²)","Width":"120 mm","at DC":"12g / 5 ms, 7g / 10 ms","title":"3RA2337-8XB30-1KB4","Height":"141 mm","Upwards":"10 mm","Forwards":"10 mm","Backwards":"0 mm","Downwards":"10 mm","At The Side":"10 mm","description":"reversing contactor assembly, AC-3e/AC-3, 65 A, 30 kW / 400 V, 3-pole, 24 V DC, 0.7-1.25* Us, with varistor plugged on, screw terminal, electrical and mechanical interlock, auxiliary contacts: 2 x 1 NO","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 and snap-on mounting onto 35 mm DIN rail","at AC-3e maximum":"700 1/h","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)","at DC rated value":"24 V","Product Brand Name":"SIRIUS","Product Designation":"Reversing contactor assembly","Of Contactor Typical":"10 000 000","at 400 V rated value":"30 kW","at 480 V rated value":"65 A","at 500 V rated value":"37 kW","at 600 V rated value":"62 A","at 690 V rated value":"37 kW","Instantaneous Contact":"2","For Main Current Circuit":"screw-type terminals","at 220/230 V rated value":"20 hp","at 460/480 V rated value":"50 hp","at 575/600 V rated value":"50 hp","Per Direction Of Rotation":"1","1 Of The Supplied Contactor":"3RT2037-1KB40","2 Of The Supplied Contactor":"3RT2037-1KB40","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"30 kW","Substance Prohibitance (Date)":"10/01/2014","Design Of The Surge Suppressor":"with varistor","of the supplied RS assembly kit":"3RA2933-2AA1","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","Product Function Bus Communication":"Yes","With Type Of Assignment 2 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 125 A","closing power of magnet coil at DC":"21.5 W","holding power of magnet coil at DC":"1 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":"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":"DC","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":"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/7e7138fd729d60dd5ee6a91b681a54e8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=689248&mlfb=3RA2337-8XB30-1KB4"},"ai":{"faq":[{"question":"Can 3RA2337-8XB30-1KB4 be used for motor reversing?","answer":"Yes. It is a reversing contactor assembly — two mechanically interlocked contactors that swap two phases to reverse a three-phase motor. Rated for AC-3 switching up to 690 V, it is designed for exactly that job."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2337-8XB30-1KB4","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/3RA2337-8XB30-1KB4 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}}