{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BB40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BB40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BB40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1025-1BB40-1AA0, 24 V DC coil, screw-type terminals, 45 mm width, IP20 front, IP00 terminals.","salesMarkdown":"The main contacts are rated for AC-3 duty at 400 V at 7.5 kW (motor switching) and at 690 V at 11 kW, which covers most three-phase induction motors in the 7.5–11 kW range. For resistive loads (AC-1), the maximum operating current is 10 A at 400 V. For reversing or inching duty (AC-4), the rating is 15.5 A at 400 V — a lower figure than AC-3 because of the increased arcing during plugging. The contactor is rated for pollution degree 3 (industrial environment with conductive pollution), operating ambient -25 to +60 °C, and maximum altitude 2 000 m without derating. The IP20 front protection means it is safe for panel-mount touch protection; the terminals themselves are IP00, so they must be covered by the enclosure or shrouded. ## Screw terminals and wiring The main current circuit uses screw-type terminals accepting 2x (1–2.5 mm²) solid or 2x (2.5–6 mm²) stranded, with a maximum of 2x 10 mm². The auxiliary contacts accept 2x (0.5–1.5 mm²) solid or 2x (0.75–2.5 mm²) stranded. This matters when designing the branch circuit protection — if you need the contactor to survive a fault, spec the 25 A fuse. The S0 frame is 45 mm wide, 85 mm tall, and 101 mm deep — fits standard 45 mm DIN-rail pitch. The screw and snap-on mechanism means no tools are needed for rail installation; a flat-head screwdriver is sufficient for terminal tightening.","metaTitle":"Siemens 3RT1025-1BB40-1AA0 SIRIUS S0 Power Contactor, 24 V D","metaDescription":"Siemens SIRIUS S0 power contactor 3RT1025-1BB40-1AA0, 24 V DC coil, screw terminals, 45 mm wide, IP20 front. Current lifecycle. Quoted to order against RFQ.","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":"24 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":"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":"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=85361&mlfb=3RT1025-1BB40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BB40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1025-1BB40-1AA0?","answer":"The closest functional peer is the 3RT1023-1AL20, which is also a SIRIUS S0 contactor but with a 24 V AC coil instead of DC. The 3RT1025-1BB40-1AA0 uses a 24 V DC coil, so the two are not drop-in interchangeable without rewiring the coil supply. For a DC coil replacement, the 3RT1025-1BB40-1AA0 is the correct choice."},{"question":"How do I get current pricing and availability for 3RT1025-1BB40-1AA0?","answer":"Submit an RFQ through this listing. Pricing and availability are confirmed at quote time based on current market conditions and independent distribution channels."},{"question":"What is the depth of this contactor?","answer":"The depth is 101 mm, with a width of 45 mm and height of 85 mm."},{"question":"What wire sizes does the auxiliary contact block accept?","answer":"The auxiliary contacts accept solid conductors: 2x (0.5–1.5 mm²) and 2x (0.75–2.5 mm²), with a maximum of 2x (0.75–4 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BB40-1AA0","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/3RT1025-1BB40-1AA0 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}}