{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2035-3KB44-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2035-3KB44-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2035-3KB44-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2035-3KB44-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S2 coupling contactor, 3RT2035-3KB44-3MA0, 24 VDC coil, spring-type terminals, 55 mm wide, 178 mm deep, rated 6 A at 24 V.","salesMarkdown":"## SIRIUS S2 Coupling Contactor – 3RT2035-3KB44-3MA0 The Siemens 3RT2035-3KB44-3MA0 is a SIRIUS S2 coupling contactor designed for switching loads in control panels and motor circuits. It mounts on a 35 mm DIN rail per DIN EN 60715, with screw and snap-on fastening, and can be rotated ±180° on a vertical surface or tilted ±22.5° forward/backward. The coil is rated 24 VDC, drawing a peak inrush of 2.6 A, with spring-type terminals for the magnet coil. Main contacts are rated for 18 to 1 A range. The AC-1 (resistive load) switching frequency maxes at 1,200 operations per hour, while AC-3 (squirrel-cage motor starting) allows 1,000 ops/h. AC-4 (plugging/reversing) drops to 300 ops/h — the duty cycle governs how hard you can push it in reversing or inching applications. At 24 V rated value, the contactor switches 6 A; at 230 V it handles 7.5 hp. Arcing time runs 10 to 20 ms, and the dropout delay on DC is 30 to 55 ms — useful timing data if you're coordinating with a safety relay or PLC output sequence. The contactor measures 55 mm wide, 114 mm high, and 178 mm deep. The S2 frame size is a common footprint in Siemens SIRIUS lineups — fits alongside overload relays and busbar systems in a standard 55 mm-wide slot. Spring-type terminals accept 2x (0.5 to 2.5 mm²) solid or stranded wire — no ferrule needed for solid, but stranded benefits from a ferrule for reliable cage grip. This part is in current lifecycle stage.","metaTitle":"Siemens 3RT2035-3KB44-3MA0 SIRIUS S2 Coupling Contactor, 24","metaDescription":"Siemens SIRIUS 3RT2035-3KB44-3MA0 S2 coupling contactor. 24 VDC coil, spring-type terminals, 55 mm wide, 178 mm deep. Rated for 6 A at 24 V, 7.5 hp at 230 V. Current lifecycle stag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"178 mm","Width":"55 mm","at DC":"30 ... 55 ms","title":"3RT2035-3KB44-3MA0","Height":"114 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 20 ms","At The Side":"6 mm","Rated Value":"24 V","description":"power contactor, AC-3e/AC-3, 41 A, 18.5 kW / 400 V, 3-pole, 24 V DC, 0.8-1.2* Us, with integrated varistor, auxiliary contacts: 2 NO + 2 NC, main circuit: screw terminal, control and auxiliary circuit: spring-loaded terminal, size: S2, suitable for PLC outputs, captive auxiliary switch","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-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":"No","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 60715","Full-Scale Value":"1.2","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 ... 2.5 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"2.6 A","Product Designation":"Coupling contactor","at 24 V rated value":"6 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 500 V rated value":"2 A","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","Locked-Rotor Current Peak":"2.1 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"40 mA","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","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"0.9 A","Duration Of Locked-Rotor Current":"230 ms","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":"spring-loaded 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":"1 W","closing power of magnet coil at DC":"21.5 W","holding power of magnet coil at DC":"1 W","At Contactor For Auxiliary Contacts":"Spring-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 ... 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)","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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"DC","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 / Q600","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":"2","number of NO contacts for auxiliary contacts instantaneous contact":"2","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$104.14","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a7292206294aab4549acebcddcc0328e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=578154&mlfb=3RT2035-3KB44-3MA0"},"ai":{"faq":[{"question":"What are the key dimensions for panel layout?","answer":"Width 55 mm, height 114 mm, depth 178 mm. Clearances: 10 mm upward, forward, and downward; 6 mm at the side."},{"question":"What is the DC coil rating and inrush?","answer":"The coil is rated 24 VDC with a peak inrush current of 2.6 A. The dropout delay on DC is 30 to 55 ms."},{"question":"Does this contactor include an auxiliary switch?","answer":"No, this variant (suffix -3MA0) does not include an auxiliary switch. If aux contacts are needed, a separate auxiliary switch block must be added."},{"question":"What wire sizes fit the spring terminals?","answer":"Spring-type terminals accept 2x (0.5 to 2.5 mm²) solid or stranded wire. Stranded wire benefits from a ferrule."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2035-3KB44-3MA0","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/3RT2035-3KB44-3MA0 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}}