{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1034-3XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1034-3XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT1034-3XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1034-3XB40-0LA2 power contactor, S2 frame size, screw-type terminals, 18.5 kW at 500 V AC-3, 15 kW at 400 V AC-2, 55 mm wide, 142 mm high, 130 mm deep.","salesMarkdown":"The 3RT1034-3XB40-0LA2: Screw-type terminals on the main circuit accept stranded conductors up to 2x 25 mm² and solid up to 2x 2.5 mm², which covers the feed and motor cable for the full rated load without needing lug adapters. The auxiliary contact block is rated 10 A at 24 VDC, 6 A at 230 VAC, and 3 A at 400 VAC — enough for a PLC input or a holding-circuit interlock. Arcing time runs 10–15 ms, and DC operating time is 20–30 ms — both within the range for standard motor starter coordination. Clearance requirements: 10 mm upwards, downwards, forwards, and to the side — standard for S2 frame spacing in a 55 mm wide footprint.","metaTitle":"Siemens 3RT1034-3XB40-0LA2 SIRIUS Power Contactor, S2, 18.5","metaDescription":"Siemens SIRIUS 3RT1034-3XB40-0LA2 power contactor, S2 frame, 18.5 kW at 500 V AC-3, 15 kW at 400 V AC-2. Current lifecycle stage. Screw terminals, DIN rail mount. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at DC":"20 ... 30 ms","Height":"142 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"2x (0.75 ... 25 mm²)","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"10 mm","Rated Value":"24 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Full-Scale Value":"1.25","Size Of Contactor":"S2","Solid Or Stranded":"2x (0.75 ... 16 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 220 V rated value":"0.3 A","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 500 V rated value":"18.5 kW","at 690 V rated value":"10 kW","Instantaneous Contact":"0","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at maximum AC-1 rated value":"16 mm²","at AC-2 at 400 V rated value":"15 kW","at AC-4 at 400 V rated value":"29 A","Substance Prohibitance (Date)":"05/01/2012","Design Of The Surge Suppressor":"with varistor","at AWG cables for main contacts":"2x (18 ... 2)","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"11 W","With Type Of Coordination 1 Required":"fuse gL/gG: 125 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","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 (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","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","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=439577&mlfb=3RT1034-3XB40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1034-3XB40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What are the key power ratings for this contactor?","answer":"AC-3 motor switching: 18.5 kW at 500 V, 10 kW at 690 V. AC-2 duty: 15 kW at 400 V. AC-1 resistive load: consult the full spec table for current ratings at your voltage."},{"question":"What wire sizes does the screw terminal accept?","answer":"Main circuit terminals accept stranded 2x (0.75–25 mm²) and solid 2x (0.25–2.5 mm²). Auxiliary contacts take 2x (0.75–16 mm²) stranded or solid."},{"question":"What clearance is needed around this contactor in a panel?","answer":"10 mm upwards, downwards, forwards, and to the side. Side-by-side mounting is allowed, so multiple units can be ganged without additional spacing."},{"question":"How do I source this part?","answer":"Submit an RFQ through the distributor. As an active-production part, it is quoted to order with standard Siemens lead times."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1034-3XB40-0LA2","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/3RT1034-3XB40-0LA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}