{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1AU04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1AU04","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1AU04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AU04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S0, 3-pole, 7.5 kW at 400 V AC-3, screw terminals, snap-on DIN rail mounting, current production.","salesMarkdown":"The Siemens SIRIUS 3RT1025-1AU04 is a size S0 power contactor with three main poles, rated for motor switching at 7.5 kW on a 400 V AC-3 supply. That AC-3 rating covers squirrel-cage motors during starting and running — the duty cycle that matters for conveyor drives, pumps, and compressors in a control panel. Screw-type terminals on the main circuit accept up to 2x 10 mm² stranded or 1x 8 AWG, so it lands on the same lug range as most 7.5 kW motor feeds. At 400 V AC-3 the contactor switches 7.5 kW; at 500 V AC-3 it handles 10 kW, and at 690 V AC-3 it reaches 11 kW. The AC-4 rating at 400 V is 15.5 A — that's the inching/plugging duty cycle for frequent reversals, which is lower than the AC-3 continuous rating. If your application requires jogging or reversing under load, size against the AC-4 figure, not the AC-3 motor nameplate. Coil operating range is 0.8 to 1.1 x rated voltage at 50 Hz (240 V coil). The auxiliary contact block has 1 NO + 1 NC instantaneous contact. Depth of 140 mm. Front-face protection is IP20, but the terminal area is IP00. Wire sizing for the coil terminals accepts 2x 0.5 to 1.5 mm² solid or 2x 0.75 to 2.5 mm² stranded; the main power terminals take up to 2x 10 mm². Use ferrules on stranded wire to avoid whiskers under the screw clamp. For type 2 coordination (no weld under fault), the required fuse is gL/gG 25 A; for type 1 (allow weld, clear fault) use 63 A.","metaTitle":"Siemens SIRIUS 3RT1025-1AU04 Power Contactor, 7.5 kW at 400","metaDescription":"Siemens SIRIUS 3RT1025-1AU04 power contactor, 3-pole, size S0, 7.5 kW at 400 V AC-3. Snap-on DIN rail mount. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"140 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","at 50 Hz":"0.8 ... 1.1","At The Side":"6 mm","On The Front":"IP20","1 Rated Value":"50 Hz","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","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 400 V rated value":"7.5 kW","at 50 Hz rated value":"240 V","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","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","operating current at AC-12 maximum":"10 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","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","apparent holding power of magnet coil at AC":"7.8 V·A","apparent pick-up power of magnet coil at AC":"61 V·A","Type Of Voltage Of The Control Supply Voltage":"AC","operating current at AC-15 at 230 V rated value":"6 A","operating current at AC-15 at 400 V rated value":"3 A","Inductive Power Factor With Closing Power Of The Coil":"0.82","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.24","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","type of connectable conductor cross-sections at AWG conductors for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12"}},"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=85336&mlfb=3RT1025-1AU04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AU04/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT1025-1AU04?","answer":"The depth is 140 mm from the mounting surface to the front of the contactor."},{"question":"What wire sizes does the main circuit accept?","answer":"Solid: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), max. 2x (0.75... 4 mm²). Stranded: 2x (1... 2.5 mm²), 2x (2.5... 6 mm²), max. 2x 10 mm². AWG equivalents: 2x (16... 12), 2x (14... 10), 1x 8."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1AU04","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/3RT1025-1AU04 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}}