{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BF40-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BF40-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BF40-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BF40-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1025-1BF40-1AA0, 110 VDC coil, screw terminals, AC-2 7.5 kW / AC-4 15.5 A at 400 V, 45 mm wide, IP20 front.","salesMarkdown":"## SIRIUS S0 power contactor with 110 VDC coil Rated for AC-2 duty at 7.5 kW and AC-4 at 15.5 A, both at 400 V — the AC-2 figure covers slip-ring motor starting, while the AC-4 rating governs plugging and inching cycles where the contactor opens under full load. Side-by-side mounting is permitted with 6 mm spacing at the side, which keeps the 45 mm pitch per unit in a multi-contactor row. The S0 frame measures 85 mm high by 45 mm wide by 101 mm deep — depth matters when the panel backplate has limited clearance to the enclosure door or rear gland plate. ## Coordination and short-circuit protection ## Auxiliary contact switching capacity The built-in auxiliary contacts handle 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — all DC resistive loads. For AC loads at 230 V the rating is 6 A, and at 400 V it's 3 A.","metaTitle":"Siemens 3RT1025-1BF40-1AA0 SIRIUS S0 Power Contactor, 110 VD","metaDescription":"Siemens SIRIUS S0 power contactor 3RT1025-1BF40-1AA0 with 110 VDC coil. AC-2 7.5 kW / AC-4 15.5 A at 400 V. Screw terminals, DIN-rail mount. Active lifecycle, sourced to order. Req","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":"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":"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=69305&mlfb=3RT1025-1BF40-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BF40-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the screw terminal accept?","answer":"Main circuit terminals accept 2x (1 to 2.5 mm²), 2x (2.5 to 6 mm²), or max 2x 10 mm² stranded. Auxiliary/control terminals accept 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²) solid."},{"question":"Will 3RT1025-1BF40-1AA0 drop into a panel specified for 3RT1023-1AL20?","answer":"Both are S0-frame contactors with the same 45 mm width and DIN-rail mount, so the mechanical footprint is identical. The difference is the coil voltage — this unit is 110 VDC, while the 3RT1023-1AL20 uses a different coil rating. Verify the control voltage before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BF40-1AA0","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/3RT1025-1BF40-1AA0 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}}