{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BF44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BF44","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BF44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BF44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1025-1BF44, 110 VDC coil, screw terminals, 7.5 kW at AC-2 400 V, 45 mm wide, IP20 front.","salesMarkdown":"The Siemens SIRIUS 3RT1025-1BF44 is a size S0 power contactor rated for 7.5 kW at AC-2 duty on a 400 V supply, with a 110 VDC coil. Front-side protection is IP20, which is standard for enclosed panel mounting; the terminals themselves carry an IP00 rating, meaning the wiring compartment expects to be inside a cabinet or shrouded. Side-by-side mounting is permitted with zero clearance — the 6 mm side spacing is the minimum for heat dissipation, not a mandatory gap. The S0 frame keeps the height at 85 mm and depth at 150 mm, so it fits most 200 mm deep enclosures without crowding the door. Main circuit terminals accept screw-type connections: solid conductors up to 2x 4 mm², stranded up to 2x 6 mm², or a single 10 mm². Auxiliary contacts (2 N.O. instantaneous) use the smaller 0.5–2.5 mm² range. For North American builds, the AWG equivalents are 2x 16–12 for the aux and 2x 14–10 for the mains, with a single 8 AWG allowed. The pollution degree is 3, so it's rated for conductive environments typical of industrial panels — no additional conformal coating needed for normal factory floor conditions.","metaTitle":"Siemens 3RT1025-1BF44 SIRIUS Power Contactor, S0, 110 VDC Co","metaDescription":"Siemens SIRIUS 3RT1025-1BF44 power contactor, size S0, 110 VDC coil, rated 7.5 kW at AC-2 400 V. Active production. Screw terminals, DIN-rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"150 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":"110 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":"10 kW","at 690 V rated value":"11 kW","Instantaneous Contact":"2","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":"7.5 kW","at AC-4 at 400 V rated value":"15.5 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=344082&mlfb=3RT1025-1BF44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BF44/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RT1025-1BF44?","answer":"Submit an RFQ through this listing. We source the part to order through independent distribution and confirm availability and current pricing at quote time."},{"question":"When sourcing 3RT1025-1BF44, what's the closest functional second-source — 3RT1023-1AL20?","answer":"The 3RT1023-1AL20 is a smaller S00 frame contactor with a 24 VDC coil and lower current ratings. It will not drop into a panel wired for the S0 frame of the 3RT1025-1BF44 without drilling new mounting holes and adjusting the busbar layout — the footprint and terminal spacing are different."},{"question":"Will 3RT1025-1BF44 drop into a panel that was specified around 3RT1023-1AL20 without rewiring?","answer":"No. The S0 frame (45 mm wide, 85 mm high, 150 mm deep) is physically larger than the S00 frame of the 3RT1023-1AL20. The mounting hole pattern and DIN-rail clip position differ, and the main terminal lugs accept larger conductors. You will need to re-drill the backplate and possibly re-lay the power cables."},{"question":"What compliance documentation does this brand provide for 3RT1025-1BF44 (RoHS, REACH, UL, IEC)?","answer":"As a Siemens SIRIUS catalog item, the 3RT1025-1BF44 carries CE marking for the European market and is designed to meet IEC 60947-4-1 standards for contactors. UL and CSA listings are typically available for the SIRIUS line; confirm the specific file number with the factory certificate at order time. RoHS and REACH declarations are standard from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BF44","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/3RT1025-1BF44 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}}