{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA2335-8XB30-1KB4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA2335-8XB30-1KB4","canonicalUrl":"https://aoctrl.com/siemens/3RA2335-8XB30-1KB4","factsUrl":"https://aoctrl.com/api/mcp/products/3RA2335-8XB30-1KB4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA2335-8XB30-1KB4 reversing contactor assembly, S2 size, 40 A at 480 V AC-3, 18.5 kW at 400 V, screw-type terminals, DIN-rail mount.","salesMarkdown":"The Siemens 3RA2335-8XB30-1KB4 is a SIRIUS reversing contactor assembly, size S2, built around two 3RT2035-1KB40 contactors mechanically interlocked for forward/reverse motor control. ## AC-3 duty ratings and what they mean for motor sizing Rated 40 A at 480 V in AC-3 duty — that's the full-load motor current it can switch without welding contacts on inductive starts. At 400 V it's rated 18.5 kW, at 690 V still 22 kW, so the voltage ceiling is 690 V AC-3/AC-3e. Mechanical life is 10 million operations typical; the maximum switching rate is 1,000 cycles per hour in AC-3 or AC-3e duty, which covers most conveyor and pump reversing applications. Coil is 24 V DC with screw-type terminals — confirm the control voltage matches your PLC output card before wiring. ## Panel fit and mounting — DIN rail with clearance specs Dimensions are 120 mm wide, 141 mm high, 130 mm deep — that's the S2 contactor footprint. Required clearances: 10 mm upward, 10 mm forward, 10 mm downward, 10 mm at the sides, and 0 mm backward (flush to the rail). Main circuit terminals accept 2x (1...35 mm²) solid or 1x (1...50 mm²) — covers most motor feeder cables up to 50 mm². ## Environmental limits and shock/vibration tolerance Withstands 12g shock for 5 ms and 7g for 10 ms at DC — rated for industrial panel vibration environments.","metaTitle":"Siemens 3RA2335-8XB30-1KB4 SIRIUS Reversing Contactor","metaDescription":"Siemens 3RA2335-8XB30-1KB4 SIRIUS reversing contactor assembly, 40 A at 480 V AC-3, 18.5 kW at 400 V. Active production, sourced to order.","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":"3RA2335-8XB30-1KB4","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, 41 A, 18.5 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":"1 000 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":"1 000 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":"18.5 kW","at 480 V rated value":"40 A","at 500 V rated value":"22 kW","at 600 V rated value":"41 A","at 690 V rated value":"22 kW","Instantaneous Contact":"2","For Main Current Circuit":"screw-type terminals","at 220/230 V rated value":"15 hp","at 460/480 V rated value":"30 hp","at 575/600 V rated value":"40 hp","Per Direction Of Rotation":"1","1 Of The Supplied Contactor":"3RT2035-1KB40","2 Of The Supplied Contactor":"3RT2035-1KB40","at AC-3 rated value maximum":"690 V","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"18.5 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: 80 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: 160 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":"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/c79687c1ea5e691f6cfcbc59aa7f62f1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=689246&mlfb=3RA2335-8XB30-1KB4"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA2335-8XB30-1KB4","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/3RA2335-8XB30-1KB4 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}}