{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1025-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1025-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT1025-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1025-1AC20, S0 size, 24 VAC 50/60 Hz coil, screw terminals, 45 mm wide, 85 mm tall, 91 mm deep.","salesMarkdown":"The 3RT1025-1AC20 is a Siemens SIRIUS power contactor, size S0, with a 24 VAC 50/60 Hz coil. It's a panel-mount motor switching device rated for AC-2 and AC-4 duty at 400 V — 7.5 kW in AC-2, 15.5 A in AC-4. That's the rating that governs real motor reversing or plugging service, not the headline thermal current. The 45 mm width per pole saves panel space over older block-style contactors. Motor power at 400 V AC-2 is 7.5 kW — that's the figure for a standard squirrel-cage start-run duty. The AC-4 rating of 15.5 A covers reversing or inching where the contactor opens under load. Coil is 24 VAC at 50/60 Hz, with a tolerance band of 0.8 to 1.1 times rated voltage at 50 Hz, 0.85 to 1.1 at 60 Hz. That's a standard control voltage for most panels; no special transformer needed. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V. That's enough for pilot duty or PLC input feedback on the same control voltage. Wire range for main contacts: solid 2x (0.5 to 1.5 mm²) up to max 2x (0.75 to 4 mm²), plus AWG equivalents. That covers most motor leads up to 4 mm² stranded. RoHS compliance date is 01.07.2006, so it meets the EU directive. The 91 mm depth fits standard enclosures. Fuse coordination: type 2 requires a 25 A gL/gG fuse; type 1 allows 63 A. That's a standard choice — type 2 for semiconductor protection, type 1 for general motor branch circuits.","metaTitle":"Siemens SIRIUS 3RT1025-1AC20 Power Contactor, 24 VAC Coil, S","metaDescription":"Siemens SIRIUS 3RT1025-1AC20 power contactor, 24 VAC coil, S0 size, 45 mm wide, rated 7.5 kW at AC-2 400 V. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"91 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 60 Hz":"0.85 ... 1.1","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","Of The Terminal":"IP00","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Size Of Contactor":"S0","Solid Or Stranded":"2x (1 ... 2,5 mm²), 2x (2,5 ... 6 mm²), max. 2x 10 mm²","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","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"7.5 kW","at AC-4 at 400 V rated value":"15.5 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 10), 1x 8","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 25 A","reference code acc. to IEC 81346-2":"Q","With Type Of Coordination 1 Required":"fuse gL/gG: 63 A","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","operational current at AC-12 maximum":"10 A","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)","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","Required Spacing For Grounded Parts At The Side":"6 mm","Inductive Power Factor With Closing Power Of The Coil":"0.72","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","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$45.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=63357&mlfb=3RT1025-1AC20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1025-1AC20/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1025-1AC20","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/3RT1025-1AC20 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}}