{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-3BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-3BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-3BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3RT1025-3BW40, screw-type terminals, DC operated coil, 10 kW at 500 V AC-3.","salesMarkdown":"Rated for AC-3 duty at 10 kW on a 500 V supply and 11 kW at 690 V, this contactor handles the motor starting and running currents typical of pumps, fans, and compressors up to that power band. The DC magnet coil draws 5.4 W to close and holds at the same 5.4 W, which means the coil driver sees a steady load without a power drop-off after pickup — a detail that matters when sizing the 24 VDC supply for a panel with multiple contactors. The IP20 front enclosure protects against finger contact; the terminals themselves are IP00, meaning the wiring compartment is open to the panel environment. Main circuit screw terminals accept solid or stranded wire: 2x (0.25 to 2.5 mm²) or 2x (2.5 to 6 mm²), with a maximum of 2x 10 mm². For AWG, that translates to 2x (16 to 12) or 2x (14 to 10), with a single 8 AWG as the max. The auxiliary contact block (not included with this base unit) uses 2x (0.25 to 2.5 mm²) solid. For Type 2 coordination (contactor remains operational after a fault), use a gL/gG 25 A fuse. These values govern the upstream short-circuit protective device selection — a decision the panel builder must make before wiring.","metaTitle":"Siemens 3RT1025-3BW40 SIRIUS Power Contactor, S0 Frame, 10 k","metaDescription":"Siemens 3RT1025-3BW40 SIRIUS power contactor, S0 frame size. Rated 10 kW at 500 V AC, 11 kW at 690 V AC. Screw terminals, DC coil. Active 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":"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 (0.25 ... 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=513713&mlfb=3RT1025-3BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-3BW40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor power ratings for this contactor?","answer":"It is rated for 10 kW at 500 V AC-3 and 11 kW at 690 V AC-3. For AC-4 duty (reversing/inching) at 400 V, the rated operational current is 15.5 A."},{"question":"What wire sizes does the main circuit accept?","answer":"Screw terminals accept 2x (0.25 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm². In AWG: 2x (16 to 12), 2x (14 to 10), or 1x 8."},{"question":"Can this contactor be mounted side-by-side with others?","answer":"Yes, side-by-side mounting is permitted, allowing dense packing on the DIN rail without required spacing between units."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-3BW40","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/3RT1025-3BW40 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}}