{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2035-1XB40-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2035-1XB40-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2035-1XB40-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2035-1XB40-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor, Size S2, 24 VDC coil, screw-type terminals, 40 A at 480 V / 41 A at 600 V, screw and snap-on mounting for 35 mm DIN rail.","salesMarkdown":"## Siemens 3RT2035-1XB40-0LA2 — SIRIUS Size S2 Contactor, 24 VDC Coil It carries a 24 VDC coil with screw-type terminals and is rated for main contact currents of 40 A at 480 V and 41 A at 600 V — figures that govern its suitability for motor circuits up to 7.5 hp at 230 V. The 24 VDC coil draws an inrush peak of 3 A and holds with a pick-up/drop-out ratio of 0.7 of rated voltage. The contactor mounts via screw or snap-on onto 35 mm standard mounting rail per DIN EN 60715, and its mounting position allows ±180° rotation on a vertical surface plus ±22.5° tilt forward/backward — useful when fitting into tight enclosures. The main contact ratings at 480 V (40 A) and 600 V (41 A) are the numbers that decide whether this contactor carries your motor load. The 40 A at 480 V figure is the AC-3 duty rating — the current it can switch motor loads under starting and running conditions. The 41 A at 600 V extends that capability into 600 V class panels common in North American installations. Auxiliary contact switching capacity is specified across multiple DC voltage levels: 10 A at 24 VDC, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, and 3 A at 400 V. These ratings define the maximum DC current the auxiliary contacts can break at each voltage — critical when the contactor is used in a DC control circuit or interposing relay scheme. Includes an auxiliary switch. Mechanical life typical of 10,000,000 operations. ## Panel Integration and Clearance Physical dimensions: 114 mm height, 55 mm width, 130 mm depth. The 55 mm width is the DIN-rail footprint — it occupies three standard 18 mm module positions on a 35 mm rail. These clearances must be maintained for heat dissipation and arc containment. Wire termination: screw-type terminals accept 2x (0.5 to 1.5 mm²) or 2x (0.75 to 2.5 mm²) solid or stranded conductors. Maximum switching frequency at AC-4 duty is 300 operations per hour.","metaTitle":"Siemens 3RT2035-1XB40-0LA2 SIRIUS Contactor, 24 VDC, Size S2","metaDescription":"Siemens SIRIUS 3RT2035-1XB40-0LA2 contactor, 24 VDC coil, Size S2 frame. Rated 40 A at 480 V, 41 A at 600 V. Screw and snap-on DIN rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Width":"55 mm","at DC":"30 ... 55 ms","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","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","Type Of Voltage":"DC","at AC-4 maximum":"300 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","Full-Scale Value":"1.25","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","Inrush Current Peak":"3 A","Product Designation":"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 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","Design Of The Product":"With extended operating range","Instantaneous Contact":"1","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","at AC-2 at AC-3e maximum":"750 1/h","Locked-Rotor Current Peak":"2.6 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"40 mA","at maximum Ith rated value":"16 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"16 mm²","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","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":"1 A","at AWG cables for main contacts":"2x (18 ... 2), 1x (18 ... 1)","Duration Of Locked-Rotor Current":"230 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","Product Function Bus 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":"23 W","holding power of magnet coil at DC":"1 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)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 W","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","Product Function Short Circuit Protection":"No","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 %","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"60 A","up to 70 °C according to IEC 60077 rated value":"50 A","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)","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=223958&mlfb=3RT2035-1XB40-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2035-1XB40-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage and type for this contactor?","answer":"The coil is 24 VDC with an inrush peak of 3 A and a pick-up ratio of 0.7 of rated voltage."},{"question":"How does the 3RT2035-1XB40-0LA2 compare to the 3RT2536-1AF00?","answer":"The 3RT2536-1AF00 is a different frame size and coil voltage variant. The 3RT2035-1XB40-0LA2 is a Size S2 with a 24 VDC coil; the 3RT2536-1AF00 is a different model. They are not direct drop-in replacements without verifying the coil voltage, frame size, and terminal layout against your panel wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2035-1XB40-0LA2","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/3RT2035-1XB40-0LA2 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}}