{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2025-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2025-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT2025-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2025-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2025-1AC20, AC-3e/AC-3, 17 A, 7.5 kW / 400 V, 3-pole, 24 V AC 50/60 Hz coil, 1 NO + 1 NC auxiliary, screw terminals, size S0.","salesMarkdown":"## SIRIUS 3RT2025-1AC20: AC-3e Motor Contactor with 24 V AC Coil The Siemens 3RT2025-1AC20 is a SIRIUS power contactor rated for AC-3e and AC-3 duty at 17 A, delivering 7.5 kW at 400 V across three poles. The 24 V AC coil operates at both 50 and 60 Hz, drawing 0.25 A at 50 Hz and 0.28 A at 60 Hz. ## What the AC-3e Rating Means for Motor Switching AC-3e is the enhanced version of AC-3, covering squirrel-cage motors where the contactor makes on inrush and breaks the running current. At 17 A in AC-3e, this contactor handles motors up to 7.5 kW at 400 V — the rating that governs real-world starting and stopping of pumps, fans, and compressors in a control panel. The mechanical life is 10 million operations typical, and the maximum switching rate in AC-3e is 1,000 cycles per hour — above that the contactor's thermal capacity limits the duty cycle. In AC-4 duty (plugging or inching), the maximum rate drops to 300 cycles per hour because the contactor breaks locked-rotor current on every operation. ## Panel Integration and Mounting Flexibility The S0 frame size measures 45 mm wide, 85 mm high, and 97 mm deep, fitting the standard 35 mm DIN rail per DIN EN 60715 with screw or snap-on fastening. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward or backward by +/-22.5°. Clearance requirements are 10 mm upwards, 10 mm downwards, 10 mm forwards, and 6 mm at the side — essential for heat dissipation and arc flash clearance in a crowded panel. ## Wire Termination and Auxiliary Contact Ratings Screw terminals accept solid or stranded wire from 1 to 10 mm², and two conductors per terminal are allowed: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²). The auxiliary switch block provides 1 NO + 1 NC contact, rated 10 A at 24 V, 2 A at 48/60 V, and 0.3 A at 220 V. ## Temperature Range and Operating Environment Rated for operation from -25 to +60 °C, with storage from -55 to +80 °C — the contactor handles the thermal extremes of an unheated enclosure in a temperate climate or a hot panel near a motor.","metaTitle":"Siemens 3RT2025-1AC20 SIRIUS Contactor, 17 A, 7.5 kW","metaDescription":"Siemens 3RT2025-1AC20 SIRIUS power contactor, AC-3e/AC-3 rated 17 A, 7.5 kW at 400 V, 24 V AC coil. 3-pole, 1 NO + 1 NC auxiliary, screw terminals, size S0.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"97 mm","Solid":"1 ... 10 mm²","Width":"45 mm","at AC":"4 ... 16 ms","title":"3RT2025-1AC20","Height":"85 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"1 ... 10 mm²","at 50 Hz":"0.25","at 60 Hz":"0.28","Downwards":"10 mm","Arcing Time":"10 ... 10 ms","At The Side":"6 mm","description":"power contactor, AC-3e/AC-3, 17 A, 7.5 kW / 400 V, 3-pole, 24 V AC, 50/60 Hz, auxiliary contacts: 1 NO + 1 NC, screw terminal, size: S0","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"1 000 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","at AC-3e maximum":"1 000 1/h","For Main Contacts":"16 ... 8","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","Size Of Contactor":"S0","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Power contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"10 000 000","at 110 V rated value":"1 A","at 125 V rated value":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"3 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"14 A","at 50 Hz rated value":"24 V","at 500 V rated value":"2 A","at 60 Hz rated value":"24 V","at 600 V rated value":"17 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 14","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"15 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"1.8 W","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"15.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"35.2 A","at AC-5b up to 400 V rated value":"14.1 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)","Without Load Current Share Typical":"7.9 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 63A (690V,100kA), aM: 32A (690V,100kA), BS88: 63A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"0.6 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","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)","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"AC","Limited To 1 S Switching At Zero Current Maximum":"225 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"225 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"189 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"140 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"115 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / P600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"10 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$29.21","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d3b94104c5b9a1b4727a23e493807a95.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=24224&mlfb=3RT2025-1AC20"},"ai":{"faq":[{"question":"What are the key ratings of the 3RT2025-1AC20?","answer":"It is a 3-pole power contactor rated 17 A in AC-3e/AC-3 duty, switching 7.5 kW at 400 V. The coil is 24 V AC at 50/60 Hz. It includes 1 NO + 1 NC auxiliary contact and uses screw terminals. The frame size is S0."},{"question":"What is the depth of the 3RT2025-1AC20?","answer":"The depth is 97 mm, with a width of 45 mm and height of 85 mm. It mounts on 35 mm DIN rail per DIN EN 60715."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2025-1AC20","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/3RT2025-1AC20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}