{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1035-1AM20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1035-1AM20","canonicalUrl":"https://aoctrl.com/siemens/3RT1035-1AM20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1035-1AM20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1035-1AM20 power contactor, size S2, screw-type terminals, 18.5 kW at 400 V AC-2, 22 kW at 500 V, 55 mm wide.","salesMarkdown":"At 500 V it carries 22 kW in AC-3 duty, covering standard squirrel-cage motors up to that power. The 690 V rating drops to 11.4 kW, reflecting the derate needed for higher voltage stress on the contacts. The 55 mm width and 112 mm height fit the S2 footprint common across the SIRIUS contactor range. Screw-type terminals on the main circuit accept stranded conductors up to 2x 25 mm², solid or stranded up to 2x 16 mm², and finer control-circuit wiring down to 0.5 mm² solid. The AC-1 maximum operating rate of 1 200 cycles per hour suits resistive loads like heaters; AC-3 maxes at 1 000 cycles/h for standard motor starts; AC-4 drops to 300 cycles/h for plugging or inching duty where the contactor breaks full locked-rotor current. Auxiliary contacts handle 10 A at 24 V, 6 A at 230 V, and 3 A at 400 V, enough for pilot duty on most PLC outputs or relay coils. ## Coil and switching characteristics Coil operates on 50/60 Hz, with an operating range of 0.8 to 1.1 times rated voltage at 50 Hz and 0.85 to 1.1 at 60 Hz. These timings matter for coordination with upstream short-circuit protection — the contactor must clear a fault before the breaker or fuse can open, or the contacts may weld.","metaTitle":"Siemens 3RT1035-1AM20 SIRIUS Power Contactor, S2, 18.5 kW AC","metaDescription":"Siemens 3RT1035-1AM20 SIRIUS power contactor, size S2, rated 18.5 kW at 400 V AC-2. Screw terminals, 35 mm DIN rail mount. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"208 V","at 500 V rated value":"22 kW","at 60 Hz rated value":"208 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":"screw-type 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 (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","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)","Thermal Short-Time Current Limited To 10 S":"400 A","Finely Stranded Without Core End Processing":"2x (0.75 ... 16 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":"$527.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=265989&mlfb=3RT1035-1AM20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1035-1AM20/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to the 3RT1035-1AM20?","answer":"The most direct peer is the 3RT1036-1AB00, which is also a SIRIUS power contactor but in a larger frame size. The 3RT1035-1AM20 is size S2; the 3RT1036-1AB00 is size S3 with higher current ratings. They share the same screw-terminal and DIN-rail mounting style, but the S3 unit is physically larger (wider) and rated for higher motor power. A panel built around the 3RT1036-1AB00 has more ampacity headroom; dropping the 3RT1035-1AM20 in its place would require verifying the load current doesn't exceed the S2's ratings."},{"question":"What are the key dimensions of the 3RT1035-1AM20?","answer":"Width is 55 mm, height is 112 mm, depth is 115 mm. This is the standard S2 SIRIUS footprint."},{"question":"What wire sizes does the 3RT1035-1AM20 accept?","answer":"Main circuit screw terminals accept stranded conductors from 2x 0.75 mm² up to 2x 25 mm², and solid or stranded from 2x 0.75 mm² up to 2x 16 mm². Control circuit terminals accept solid from 2x 0.5 mm² up to 2x 4 mm²."},{"question":"Will the 3RT1035-1AM20 drop into a panel designed for the 3RT1036-1AB00?","answer":"Not without mechanical and electrical verification. The 3RT1035-1AM20 is size S2 (55 mm wide), while the 3RT1036-1AB00 is size S3 (wider). The DIN-rail mounting method is the same, but the S3 contactor occupies more panel width and has higher current ratings. If the panel was designed for the S3 footprint, the S2 unit will fit in the rail space but leave a gap and may not align with pre-drilled busbar or lug positions. Electrically, the 3RT1035-1AM20 must be rated for the actual load — its 18.5 kW AC-2 rating is lower than the S3's capability."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1035-1AM20","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/3RT1035-1AM20 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}}