{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2025-1AD20-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2025-1AD20-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2025-1AD20-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2025-1AD20-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2025-1AD20-1AA0, Size S0 power contactor, 24 VDC coil, screw-type terminals, 45 mm width, snap-on DIN rail mounting.","salesMarkdown":"## SIRIUS S0 power contactor — what fits and what doesn't The S0 frame means it occupies 45 mm of DIN-rail width and stands 85 mm tall — a standard footprint that drops into most European-style panels without re-drilling gland plates. Rated for 1,000 operating cycles per hour under AC-1, AC-2, AC-3, and AC-3e duty, this contactor handles continuous switching of resistive and motor loads. The AC-4 rating drops to 300 cycles/h — that's the wear limit for plugging or inching duty, so if your application reverses the motor under load, expect shorter contact life at higher frequencies. ## Mounting and wiring — DIN rail clearance The standing position on a horizontal mounting surface is specified — don't lay it on its side without checking the manufacturer's derating curves. That 6 mm side gap is tight — adjacent devices on the same rail need that much breathing room for heat dissipation. For fine-stranded wire, the spec allows 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) — useful when paralleling control wiring. The coil connection uses screw-type terminals, so keep a PZ1 bit handy for termination. ## Auxiliary contact ratings — what it switches on the control side The built-in auxiliary switch is rated for 10 A at 24 V, 2 A at 48 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 0.6 A at 440 V. At 400 V it's rated 3 A. These are the make-and-break capacities for the auxiliary contacts — useful for PLC inputs, relay coils, or indicator lamps. The 230 V rating is given as 3 hp, which is the motor load the auxiliary can switch directly. ## Coil and arcing characteristics Coil holding current is 0.25 A at 50 Hz and 0.28 A at 60 Hz — the DC coil on this variant doesn't have a holding current spec listed, but the AC values give a sense of the inrush if you're sizing a control transformer for a mixed AC/DC panel. Arcing time is listed as 4 to 16 ms with a tighter 10 to 10 ms figure — the spread likely reflects load-dependent variation.","metaTitle":"Siemens 3RT2025-1AD20-1AA0 SIRIUS Power Contactor, S0 Frame,","metaDescription":"Siemens SIRIUS 3RT2025-1AD20-1AA0 power contactor, size S0, 24 VDC coil, screw terminals, 45 mm wide, current production. Sourced to order.","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","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","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 standard mounting rail according to DIN EN 60715","at AC-3e maximum":"1 000 1/h","For Main Contacts":"16 ... 8","Mounting Position":"standing, on horizontal 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":"42 V","at 500 V rated value":"2 A","at 60 Hz rated value":"42 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-2 at 400 V rated value":"7.5 kW","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","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","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)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"0.6 W","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":"180 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"115 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"96 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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e1391b9f93b53d47200c4360dd428dda.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=576288&mlfb=3RT2025-1AD20-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2025-1AD20-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional alternative — the 3RT2026-1AG20?","answer":"The 3RT2026-1AG20 is a higher-current variant in the same SIRIUS S0 frame family. It will share the same 45 mm width and DIN-rail footprint, so it drops into the same panel cutout. The deciding factor is the load current: the 3RT2025-1AD20-1AA0 is sized for lower motor ratings. Verify your full-load amps before substituting upward."},{"question":"What is the depth of this contactor?","answer":"The depth is 97 mm. That's the dimension from the DIN-rail mounting surface to the front of the device — important for enclosure depth clearance."},{"question":"What conductor sizes does it accept?","answer":"Main terminals accept solid or stranded wire from 1 to 10 mm². For fine-stranded wire, it accepts 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²)."},{"question":"Will the 3RT2025-1AD20-1AA0 drop into a panel specified for the 3RT2026-1AG20?","answer":"Yes, mechanically. Both are S0 frame size with the same 45 mm width and DIN-rail snap-on mounting. No rewiring of the mounting rail is needed. However, the 3RT2026-1AG20 is rated for a higher motor current — if the panel was designed around that higher rating, the 3RT2025-1AD20-1AA0 may be undersized for the load."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2025-1AD20-1AA0","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/3RT2025-1AD20-1AA0 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}}