{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-3BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-3BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-3BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1024-3BW40, screw-type terminals, DC magnet coil, 5.5 kW at AC-2 400 V, 12.5 A at AC-4 400 V.","salesMarkdown":"Rated at 5.5 kW in AC-2 duty at 400 V, this contactor handles wound-rotor motor starting and reversing applications. The DC magnet coil draws 5.4 W during both closing and holding, which simplifies the control transformer sizing — no inrush peak to budget for. The coil operates across a range of DC voltages; at 24 V rated value it switches 10 A on the auxiliary contacts, and at 60 V rated value it switches 2 A. For Type 1 coordination (contactor may need replacement after fault), the fuse can be gL/gG 63 A. This lets the panel builder choose between protecting the contactor or minimizing fuse size, depending on the application's criticality. ## Mounting and environment Side-by-side mounting is permitted, so multiple contactors pack tightly in a row without derating. The front face carries IP20 protection; the terminals themselves are IP00, meaning the wiring compartment expects enclosure protection from the panel. Pollution degree 3 means it tolerates conductive pollution in industrial atmospheres — typical for a control panel not in a clean room.","metaTitle":"Siemens 3RT1024-3BW40 SIRIUS Power Contactor, S0, 5.5 kW AC-","metaDescription":"Siemens SIRIUS 3RT1024-3BW40 power contactor, size S0. Rated 5.5 kW at AC-2 400 V, 12.5 A at AC-4. Screw terminals, DC coil. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"100 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"45 mm","Height":"85 mm","Maximum":"2 000 m","At The Side":"6 mm","Rated Value":"48 V","On The Front":"IP20","Initial Value":"0.8","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Full-scale value":"1.1","Size of contactor":"S0","Product brand name":"SIRIUS","Degree of pollution":"3","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":"7.5 kW","at 690 V rated value":"7.5 kW","Instantaneous Contact":"0","Side-by-side mounting":"Yes","For Main Current Circuit":"screw-type terminals","Single Or Multi-Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","at AC-2 at 400 V rated value":"5.5 kW","at AC-4 at 400 V rated value":"12.5 A","Closing power of magnet coil at DC":"5.4 W","Holding power of magnet coil at DC":"5.4 W","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","at AWG conductors for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","Reference code acc. to DIN EN 81346-2":"Q","Number of NC contacts for main contacts":"0","Number of NO contacts for main contacts":"3","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (24 ... 14)","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"spring-loaded terminals","at ambient temperature 40 °C rated value":"40 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type of voltage of the control supply voltage":"DC","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 Electronics-Compatible 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=364170&mlfb=3RT1024-3BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-3BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"At AC-2 duty on 400 V it is rated 5.5 kW. At AC-4 reversing duty on 400 V it is rated 12.5 A. At 690 V AC-3 duty it is rated 7.5 kW."},{"question":"What fuse coordination does this contactor require?","answer":"For Type 2 coordination (no damage to the contactor), use a gL/gG 25 A fuse upstream. For Type 1 coordination (contactor may be sacrificial), use a gL/gG 63 A fuse."},{"question":"Does this contactor mount on standard DIN rail?","answer":"Yes, it mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 50022. Side-by-side mounting is allowed."},{"question":"What is the coil power consumption?","answer":"The DC magnet coil draws 5.4 W during both closing and holding — no inrush peak."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-3BW40","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/3RT1024-3BW40 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}}