{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1BM44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1BM44","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1BM44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BM44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S0 power contactor, 3RT1025-1BM44, screw-type terminals, 7.5 kW AC-2 at 400 V, 15.5 A AC-4, 45 mm wide, snap-on DIN rail mount.","salesMarkdown":"Rated at 7.5 kW in AC-2 duty at 400 V and 15.5 A in AC-4 at 400 V, this contactor handles the inrush and breaking demands of wound-rotor and squirrel-cage motors. AC-2 covers slip-ring motors; AC-4 covers reversing, plugging, and inching — the tougher duty cycle that generates more arc wear. The 45 mm wide body (S0 frame) fits standard panel layouts. Side-by-side mounting is allowed — no gap needed between units — which saves rail space in dense panels. Main circuit terminals accept 2x (1 to 2.5 mm²) stranded, 2x (2.5 to 6 mm²), or up to 2x 10 mm². Auxiliary/control terminals take 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) stranded, max 2x (0.75 to 4 mm²). That covers most panel wire sizes without needing adapters. The magnet coil draws 5.4 W on pickup and 5.4 W holding — DC holding, so no AC hum and consistent power draw. For Type 1 coordination (contactor may need replacement after a fault), the fuse can go up to 63 A. This lets you balance protection level against fuse size — Type 2 keeps the contactor in service, Type 1 saves panel space with a larger fuse.","metaTitle":"Siemens 3RT1025-1BM44 SIRIUS Power Contactor, S0, 7.5 kW AC-","metaDescription":"Siemens 3RT1025-1BM44 SIRIUS S0 power contactor. 7.5 kW at AC-2 400 V, 15.5 A AC-4. Screw terminals, DIN rail mount. Current lifecycle. Available to order.","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":"220 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=409964&mlfb=3RT1025-1BM44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1BM44/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for 3RT1025-1BM44?","answer":"It is rated 7.5 kW at AC-2 400 V and 15.5 A at AC-4 400 V. The AC-4 rating governs contact life for reversing or inching duty."},{"question":"Will 3RT1025-1BM44 drop into a panel specified for 3RT1023-1AL20?","answer":"Both are S0-size contactors with the same 45 mm width and DIN-rail mounting, so the footprint and rail clip are identical. Terminal layout and coil voltage may differ — verify the coil rating and auxiliary contact arrangement against your schematic before swapping."},{"question":"What is the depth of 3RT1025-1BM44?","answer":"The depth is 150 mm, which includes the body and terminal projection. Allow clearance for wiring and finger access in the enclosure."},{"question":"What compliance documentation is available for 3RT1025-1BM44?","answer":"The contactor carries a DIN EN 81346-2 reference code Q and is designed for pollution degree 3 environments. Standard Siemens documentation includes CE, RoHS, and REACH declarations; specific certificates can be requested at quote time."},{"question":"Where can I buy 3RT1025-1BM44 and how is it quoted?","answer":"We source this part through independent industrial distribution channels. Submit an RFQ for current pricing and lead time — availability is confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1BM44","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/3RT1025-1BM44 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}}