{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2035-1AM20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2035-1AM20","canonicalUrl":"https://aoctrl.com/siemens/3RT2035-1AM20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2035-1AM20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2035-1AM20 power contactor, size S2, 40 A AC-3 at 480 V, 208 V 50 Hz coil, screw-type terminals, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"## SIRIUS S2 frame — 40 A AC-3 switching for motor loads The 3RT2035-1AM20 is a Siemens SIRIUS power contactor in the S2 frame size, rated 40 A at 480 V in AC-3 duty — the standard category for squirrel-cage motor switching. That 40 A AC-3 figure is the one that governs real motor starts; the contactor handles 1,000 operations per hour in AC-3 and AC-3e service. Coil is 208 V at 50 Hz, drawing 0.36 A holding current at 50 Hz and 0.39 A at 60 Hz. The magnet coil uses screw-type terminals, matching the main circuit termination style. Mechanical endurance is rated 10 million operations typical — this is the unloaded cycle life; electrical endurance under AC-3 load will be lower and depends on the actual switching current and frequency. ## DIN rail mounting and panel clearances Mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715. The mounting position allows +/-180° rotation on a vertical surface and can be tilted forward/backward by +/-22.5° — useful when fitting into tight or angled panel sections. Dimensions: 55 mm wide, 114 mm high, 130 mm deep. Clearance distances for arc flash and heat dissipation: 10 mm upwards, 10 mm forwards, 10 mm downwards, and 6 mm at the side. These are the minimum free-air gaps — stacking contactors closer without derating risks thermal accumulation or phase-to-phase tracking. Conductor cross-section accepted: 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded — this covers most control-circuit wiring up to 14 AWG. The main power terminals accept larger conductors; the spec table on the product page lists the full range. ## Switching duty and operating rates Maximum operating rates vary by duty category: 1,200 ops/h in AC-1 (resistive), 1,000 ops/h in AC-3 and AC-3e (motor start/run), 750 ops/h in AC-2 (slip-ring motor), and 300 ops/h in AC-4 (plugging/inching). The AC-4 rate is the limiting factor for reversing or jogging applications. Arcing time spans 10 to 20 ms, with an AC operating time of 10 to 18 ms. These matter for coordination with upstream short-circuit protection devices — the let-through energy during arcing determines whether the fuse or breaker clears before the contactor welds. ## Auxiliary contact block and ratings The contactor includes an auxiliary switch with 1 N/O + 1 N/C configuration (18 to 1 on the main contact count). Auxiliary contact ratings: 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, 3 A at 400 V, and 0.6 A at 440 V. These are the maximum continuous currents — derate for inductive DC loads per the application note. The 7.5 hp rating at 230 V gives a quick cross-check for North American motor sizing on single-phase applications. ## Environmental range and storage Operating temperature range is -25 to +60 °C; storage range is -55 to +80 °C. The wider storage envelope means the contactor can sit in an unheated warehouse or truck without damage, but the operating ceiling of 60 °C limits panel internal ambient — factor in heat rise from other components when grouping contactors.","metaTitle":"Siemens 3RT2035-1AM20 SIRIUS Power Contactor, S2, 40 A AC-3","metaDescription":"Siemens 3RT2035-1AM20 SIRIUS power contactor, size S2, rated 40 A at 480 V AC-3. Screw and snap-on DIN rail mounting. Current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Width":"55 mm","at AC":"10 ... 18 ms","title":"3RT2035-1AM20","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.36","at 60 Hz":"0.39","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","description":"power contactor, AC-3e/AC-3, 41 A, 18.5 kW / 400 V, 3-pole, 208 V AC, 50/60 Hz, auxiliary contacts: 1 NO + 1 NC, screw terminal, size: S2","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 200 1/h","at AC-2 maximum":"750 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":"18 ... 1","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":"S2","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":"7.5 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.6 A","at 480 V rated value":"40 A","at 50 Hz rated value":"208 V","at 500 V rated value":"2 A","at 60 Hz rated value":"208 V","at 600 V rated value":"41 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":"3 hp","at 200/208 V rated value":"10 hp","at 220/230 V rated value":"15 hp","at 460/480 V rated value":"30 hp","at 575/600 V rated value":"40 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":"6.6 W","at AC-2 at 400 V rated value":"18.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"35 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2014","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"52.8 A","at AC-5b up to 400 V rated value":"33.2 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 80A (690V,100kA), aM: 50A (690V,100kA), BS88: 63A (415V,80kA)","Without Load Current Share Typical":"17.2 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","With Type Of Coordination 1 Required":"gG: 160 A (690 V, 100 kA), aM: 80 A (690 V, 100 kA), BS88: 125 A (415 V, 80 kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 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":"843 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"596 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"400 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"241 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"196 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":"16 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":"$266.85","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/92af77308809a9676b8016171e70e3e5.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=427302&mlfb=3RT2035-1AM20"},"ai":{"faq":[{"question":"What is the 3RT2035-1AM20 rated for in AC-3 motor duty?","answer":"It is rated 40 A at 480 V in AC-3 duty, which is the standard category for starting and running squirrel-cage motors. This is the headline rating that governs motor sizing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2035-1AM20","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/3RT2035-1AM20 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}}