{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT7035-1AC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT7035-1AC20","canonicalUrl":"https://aoctrl.com/siemens/3RT7035-1AC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT7035-1AC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S2 contactor, 3RT7035-1AC20, 3-pole, AC-3, AC 24V 50/60Hz coil, screw terminals, IP20 front, 55 mm width, 115 mm depth.","salesMarkdown":"## SIRIUS S2 contactor, 3-pole, AC coil The Siemens 3RT7035-1AC20 is a Size S2 contactor from the SIRIUS family, with three main poles and three normally-open main contacts. The magnet coil draws 0.73 W to close and holds at 0.41 W DC. Main current circuit and auxiliary/control circuit both use screw-type terminals. Wire capacity is 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid/stranded, and finely stranded with ferrule. Side-by-side mounting is allowed, so multiple contactors can pack tightly on the rail. Pollution degree 3 applies, so it's rated for conductive environments typical of industrial panels. Auxiliary switch blocks can be added (product extension auxiliary switch: Yes). For short-circuit protection, Type 2 coordination requires a gL/gG NH 3NA fuse rated 80 A; Type 1 coordination allows a 125 A fuse of the same type. This matters when coordinating with upstream breakers for selectivity. The contactor handles mechanical shock: 15g for 5 ms and 8g for 10 ms sine pulse. Operating temperature range is -10 to +55 °C; storage from -25 to +70 °C. Maximum switching frequency is 800 operations per hour under AC-3 duty, and 250 per hour under AC-4 (plugging/inching). That's typical for a contactor this size — fine for normal motor starting, but limit if you're doing frequent reversing.","metaTitle":"Siemens 3RT7035-1AC20 Contactor, S2, 3-pole, AC 24V 50/60Hz","metaDescription":"Siemens 3RT7035-1AC20 SIRIUS S2 contactor, 3-pole, AC-3 rated 690V max, AC 24V 50/60Hz coil. IP20 front, screw terminals. Current production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"115 mm","Width":"55 mm","title":"3RT7035-1AC20","Height":"112 mm","at 50 Hz":"0.42","at 60 Hz":"0.42","description":"Contactor AC-3 40A/18,5kW 400V 24 VAC, 50/60 Hz 3-pole, Size S2 Screw terminal","On The Front":"IP20","During Storage":"-25 ... +70 °C","Of The Terminal":"IP00","at AC-3 maximum":"800 1/h","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","During Operation":"-10 ... +55 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","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)","Degree Of Pollution":"3","at 230 V rated value":"6 A","at 400 V rated value":"3 A","at 50 Hz rated value":"24 V","at 60 Hz rated value":"24 V","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Insulation Voltage Rated Value":"690 V","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","With Type Of Assignment 2 Required":"gL/gG NH 3NA: 80 A","closing power of magnet coil at DC":"0.73 W","holding power of magnet coil at DC":"0.41 W","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"gL/gG NH 3NA: 125 A","shock resistance with sine pulse at AC":"15g / 5 ms, 8g / 10 ms","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","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":"acceptability for PLC control (17 V, 5 mA)","Type Of Voltage Of The Control Supply Voltage":"AC","operating voltage at AC-3 rated value maximum":"690 V","operational current at DC-13 at 220 V rated value":"0.3 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Required Spacing With Side-By-Side Mounting At The Side":"0 mm","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","Connectable Conductor Cross-Section For Main Contacts Finely Stranded With Core End Processing":"25 mm²","Connectable Conductor Cross-Section For Auxiliary Contacts Finely Stranded With Core End Processing":"0.5 ... 2.5 mm²"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/35471fe6e590e6d1df105b8c8739d89c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1534025&mlfb=3RT7035-1AC20"},"ai":{"faq":[{"question":"Will 3RT7035-1AC20 drop into a panel wired for 3RT5036-1AB00?","answer":"Both are SIRIUS contactors, but the 3RT7035-1AC20 is a Size S2 frame with a 55 mm width, while the 3RT5036-1AB00 is a different frame size. Check the mounting footprint and terminal layout against your existing panel before assuming a direct swap — the rail mount is the same 35 mm DIN standard, but the screw-terminal positions may differ."},{"question":"What are the key dimensions of 3RT7035-1AC20?","answer":"Width 55 mm, height 112 mm, depth 115 mm. These dimensions are for the contactor body without auxiliary blocks."},{"question":"What compliance documentation is available for 3RT7035-1AC20?","answer":"The part carries a rated insulation voltage of 690 V and surge voltage resistance of 6 kV. Standard Siemens SIRIUS documentation includes RoHS and REACH declarations; specific certificates (UL, CSA, IEC) should be confirmed at quote time as they vary by production batch and destination."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT7035-1AC20","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/3RT7035-1AC20 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}}