{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1AC24","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1AC24","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1AC24","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AC24","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1025-1AC24 power contactor, S0 frame, 24 V 50/60 Hz coil, AC-3 rated 10 kW at 500 V / 11 kW at 690 V, 45 mm width, screw and snap-on DIN rail mount.","salesMarkdown":"It's the part you spec into a panel when you need a 24 V AC coil that pulls in reliably on both 50 and 60 Hz supplies, and you want to snap it onto a standard 35 mm DIN rail per EN 50022 without reaching for screws. The AC-3 motor switching rating is the one that governs the BOM line: 10 kW at 500 V and 11 kW at 690 V. That's the figure you match to your motor nameplate for standard squirrel-cage starting — not the AC-1 resistive current (10 A max) or the AC-4 reversing/inching duty (15.5 A at 400 V), which are lower. The coil is rated 24 V at both 50 Hz and 60 Hz — the operating range spans 0.8 to 1.1 times rated voltage at 50 Hz, and 0.85 to 1.1 at 60 Hz. That means it holds in down to about 19.2 V on a 50 Hz supply, which gives you some headroom for voltage drop on long cable runs in the panel. Pollution degree 3 means this contactor is rated for the conductive dust and humidity you find inside industrial enclosures — not a clean room part. The IP20 front protection keeps fingers out; the IP00 terminals mean those lug connections are live with the cover off, so standard warning labels apply. The 10 million mechanical cycles typical is the no-load endurance; under full AC-3 load, expect derating per the contactor's electrical life curve. The S0 frame is 45 mm wide and 85 mm tall, so it occupies one standard 45 mm DIN cell. Side-by-side mounting is permitted, which means you can gang several of these on a rail without mandatory spacing gaps — but the 6 mm clearance to grounded metal on the sides still applies for creepage. Main contact terminals accept 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) stranded, or up to 2x 4 mm² max. For AWG, that's 2x (16 to 12) solid, 2x (14 to 10) stranded, or 1x 8. The coil terminals take 2x (1 to 2.5 mm²) or up to 2x 10 mm². Strip length is not listed here, but 8 mm is typical for this terminal class. Type 1 coordination (welding allowed but no fire risk) takes a 63 A gL/gG fuse. That's your short-circuit protection sizing — not a suggestion, it's what the coordination tests certify.","metaTitle":"Siemens 3RT1025-1AC24 SIRIUS Power Contactor, 24 V Coil, S0","metaDescription":"Siemens 3RT1025-1AC24 SIRIUS power contactor. 24 V 50/60 Hz coil. S0 frame, 45 mm wide. AC-3 rated 10 kW at 500 V / 11 kW at 690 V. DIN rail snap-on. Active production.","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","Maximum":"2 000 m","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","At The Side":"6 mm","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","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 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"24 V","at 500 V rated value":"10 kW","at 60 Hz rated value":"24 V","at 690 V rated value":"11 kW","Instantaneous Contact":"2","Side-by-side mounting":"Yes","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","protection class IP on the front":"IP20","Operating current at AC-12 maximum":"10 A","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","Protection class IP of the terminal":"IP00","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)","at ambient temperature 40 °C rated value":"40 A","Apparent holding power of magnet coil at AC":"8.4 V·A","Apparent pick-up power of magnet coil at AC":"64 V·A","Type of voltage of the control supply voltage":"AC","Inductive power factor with closing power of the coil":"0.72","Type of electrical connection for main current circuit":"screw-type terminals","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","Type of electrical connection for auxiliary and control current circuit":"screw-type terminals","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=120081&mlfb=3RT1025-1AC24","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AC24/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"AC-3 motor duty: 10 kW at 500 V and 11 kW at 690 V. AC-4 reversing duty: 15.5 A at 400 V. AC-2 slip-ring duty: 7.5 kW at 400 V. The coil is 24 V, rated for both 50 and 60 Hz."},{"question":"Does this contactor fit on a standard DIN rail?","answer":"Yes, it mounts via screw and snap-on onto a 35 mm standard mounting rail per DIN EN 50022. The S0 frame is 45 mm wide and 85 mm tall, occupying one standard DIN cell."},{"question":"What fuse rating is needed for Type 2 coordination?","answer":"Type 2 coordination (no contact welding) requires a gL/gG fuse rated 25 A. Type 1 coordination (welding permitted) uses a 63 A gL/gG fuse."},{"question":"What wire sizes fit the main and coil terminals?","answer":"Main contacts: 2x (0.5 to 1.5 mm²) solid, 2x (0.75 to 2.5 mm²) stranded, max 2x 4 mm². AWG: 2x (16 to 12) solid, 2x (14 to 10) stranded, 1x 8. Coil terminals: 2x (1 to 2.5 mm²) or up to 2x 10 mm²."},{"question":"What compliance documentation comes with this part?","answer":"The part carries a DIN EN 81346-2 reference code Q. The SIRIUS series is generally UL/CSA/CE certified, though specific agency marks are not listed in this record. Standard Siemens declaration of conformity and RoHS/REACH documentation is available upon request through the supply channel."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1AC24","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/3RT1025-1AC24 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}}