{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1024-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1024-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1024-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1024-1BW40 power contactor, S0 frame, 48 VDC coil, screw-type terminals, 45 mm width, IP20 front protection.","salesMarkdown":"It carries a 48 VDC coil and is rated for AC-2 duty at 5.5 kW at 400 V, and AC-4 at 12.5 A at 400 V — the AC-4 figure is the one that governs reversing or plugging duty where the contactor makes and breaks the motor current under load. The DC coil draws 5.4 W on closing and 5.4 W to hold, so the holding power is the same as the inrush — no extra thermal load on the control transformer once it's sealed. The 48 VDC coil is the main spec that decides fit — if your control voltage is 24 VDC or 110 VDC, this isn't the variant you want. The coil pull-in and dropout thresholds aren't listed here, but the holding power being equal to closing power (5.4 W) means the coil doesn't have a separate economy winding; it's a single-winding DC design. For short-circuit coordination, Type 2 coordination requires a gL/gG fuse rated 25 A, while Type 1 coordination allows up to 63 A. That's the difference between protecting the contactor itself (Type 2) versus just clearing the fault (Type 1). ## Panel integration At 45 mm wide and 85 mm tall, with a 101 mm depth, this S0 contactor fits the standard DIN-rail footprint. Screw-type terminals on the main circuit accept solid or stranded conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), up to max 2x (0.75 to 4 mm²). For AWG, that's 2x (16 to 12), 2x (14 to 10), or 1x 8. The coil terminals are separate and follow the same wire range.","metaTitle":"Siemens 3RT1024-1BW40 SIRIUS Power Contactor, S0 Frame, 48 V","metaDescription":"Siemens SIRIUS 3RT1024-1BW40 power contactor, S0 frame, 48 VDC coil, 45 mm wide, IP20 front, screw terminals. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"101 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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 (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number of poles for main current circuit":"3","at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","Contact reliability of auxiliary contacts":"1 faulty switching per 100 million (17 V, 1 mA)","For Auxiliary And Control Current Circuit":"screw-type terminals","at ambient temperature 40 °C rated value":"40 A","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=309139&mlfb=3RT1024-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1024-1BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this contactor?","answer":"The coil is 48 VDC drawing 5.4 W. For motor loads, it's rated 5.5 kW at AC-2 at 400 V, and 12.5 A at AC-4 at 400 V. The DC switching capacity is 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V."},{"question":"What is the physical size and mounting?","answer":"It's an S0 frame: 45 mm wide, 85 mm tall, 101 mm deep. Mounts on 35 mm DIN rail per EN 50022 via screw or snap-on. Side-by-side mounting is allowed with 6 mm clearance."},{"question":"Can this contactor be used in washdown environments?","answer":"No. The front is IP20 (finger-safe), but the terminals are IP00, so it's not rated for moisture or washdown. It belongs inside a closed panel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1024-1BW40","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/3RT1024-1BW40 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}}