{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1035-3AD20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1035-3AD20","canonicalUrl":"https://aoctrl.com/siemens/3RT1035-3AD20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1035-3AD20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S2, screw-type terminals, 3RT1035-3AD20, 18.5 kW at 400 V AC-2, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens SIRIUS 3RT1035-3AD20 is a size S2 power contactor with screw-type terminals for the main current circuit, rated for 18.5 kW at 400 V in AC-2 duty — that's the category for slip-ring motor starting, where the contactor makes and breaks the rotor circuit under load. The AC-3 rating (direct-on-line squirrel-cage motors) is typically higher for this frame; AC-2 is the limiting case for this variant. The enclosure front carries IP20; the terminal area is IP00 (open terminals), so keep live parts behind a panel door or cover. Rated operational current on the main contacts: 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.3 A at 220 V, 6 A at 230 V, 3 A at 400 V — these are the DC-1 / DC-3 load-break values for the auxiliary or main poles when switching DC loads. Dimensions: 55 mm wide, 112 mm high, 115 mm deep. The depth matters when you're laying out a shallow enclosure — 115 mm is the body depth; add clearance for the screw terminals and wire bend radius. Accepts solid conductors 2x (0.25 to 2.5 mm²) and stranded 2x (0.75 to 25 mm²) for the main circuit, plus a separate 2x (0.75 to 16 mm²) range for auxiliary wiring. Use ferruled stranded for reliability under vibration. Coil operating range: 0.8 to 1.1 times rated voltage at 50 Hz, 0.85 to 1.1 at 60 Hz. Pick a control transformer that stays within that band under load. Coil pickup and dropout timing: arcing time 10 to 15 ms, with AC operate time 7 to 20 ms. That's fast enough for most interlocking but verify if your safety circuit requires a specific break time. ## Environmental and operating limits Mechanical endurance typical: 10 million operations. That's the no-load life; electrical life depends on the switching category and load current — AC-4 at 300 cycles/hour will wear the contacts faster than AC-1 at 1200.","metaTitle":"Siemens 3RT1035-3AD20 SIRIUS Power Contactor, 18.5 kW AC-2","metaDescription":"Siemens SIRIUS power contactor 3RT1035-3AD20. Size S2, screw terminals, 18.5 kW at 400 V AC-2. DIN rail snap-on. Current lifecycle. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at AC":"7 ... 20 ms","Height":"112 mm","Stranded":"2x (0.75 ... 25 mm²)","at 50 Hz":"0.8 ... 1.1","at 60 Hz":"0.85 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20","1 Rated Value":"50 Hz","2 Rated Value":"60 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"600 1/h","at AC-3 maximum":"1 000 1/h","at AC-4 maximum":"300 1/h","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":"S2","Solid Or Stranded":"2x (0.75 ... 16 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":"42 V","at 500 V rated value":"22 kW","at 60 Hz rated value":"42 V","at 690 V rated value":"11.4 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"18.5 kW","at AC-4 at 400 V rated value":"35 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"16 mm²","at 60 °C minimum permissible":"16 mm²","Insulation Voltage Rated Value":"690 V","at 230 V at 60 °C rated value":"22 kW","at 690 V at 60 °C rated value":"66 kW","at AWG cables for main contacts":"2x (18 ... 2)","For Auxiliary And Control Circuit":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 125 A","at AWG cables for auxiliary contacts":"2x (24 ... 14)","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","Thermal Short-Time Current Limited To 10 S":"400 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"15 VA","apparent pick-up power of magnet coil at AC":"170 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.76","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.35","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=127085&mlfb=3RT1035-3AD20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1035-3AD20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1035-3AD20 and what is the lead time?","answer":"The part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure on this page."},{"question":"What is the closest functional second-source to 3RT1035-3AD20?","answer":"The 3RT5035-1AH00 is a peer from the same SIRIUS family but check the coil voltage and terminal arrangement — the 3RT1035-3AD20 uses screw terminals and a specific coil rating; verify fit before substituting."},{"question":"What is the depth of 3RT1035-3AD20?","answer":"115 mm body depth, excluding terminal projection and wire bend radius."},{"question":"What solid wire sizes does 3RT1035-3AD20 accept?","answer":"2x (0.25 to 2.5 mm²) solid conductors for the main circuit."},{"question":"Will 3RT1035-3AD20 drop into a panel specified around 3RT5035-1AH00 without rewiring?","answer":"Physical footprint (55 mm width, DIN rail mount) is compatible, but verify terminal type — the 3RT1035-3AD20 uses screw terminals, while the 3RT5035-1AH00 may use spring-cage; also check coil voltage rating matches."},{"question":"What compliance documentation does Siemens provide for 3RT1035-3AD20?","answer":"Standard SIRIUS documentation includes RoHS, REACH, and IEC/EN 60947-4-1 declarations; UL and CSA approvals are typical for this series but confirm with the specific variant. The evidence does not list certs for this exact order code."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1035-3AD20","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/3RT1035-3AD20 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}}