{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1035-3BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1035-3BD40","canonicalUrl":"https://aoctrl.com/siemens/3RT1035-3BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1035-3BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S2, order code 3RT1035-3BD40, 18.5 kW at 400 V AC-2, screw-type terminals, DIN-rail mount.","salesMarkdown":"## SIRIUS 3RT1035-3BD40 — Power Contactor, Size S2 The Siemens 3RT1035-3BD40 is a SIRIUS power contactor in the Size S2 frame, rated 18.5 kW at 400 V in AC-2 duty and 22 kW at 500 V — a common pick for switching slip-ring motor loads or medium-duty compressors where the AC-2 rating governs the thermal capacity, not the AC-3 number. ## Ratings That Drive the Selection AC-4 at 400 V is rated 35 A — that is the reversing / plugging / inching duty cycle, where the contactor sees make-and-break at locked-rotor current. If your application cycles the motor direction or jogs it under load, the AC-4 rating is the one that keeps the contacts from welding. The 690 V rating drops to 11.4 kW — expect that derating when the line voltage climbs above 500 V. The 42 V rated value is the coil voltage; verify your control transformer matches before wiring. Main current circuit uses screw-type terminals, accepting solid conductors 2x (0.25 … 2.5 mm²) and stranded 2x (0.75 … 25 mm²). At 40 °C the minimum permissible cross-section is 16 mm² — that is the thermal floor for full-rated current without exceeding the terminal temperature rise. Front face carries IP20 (finger-safe); the terminal area is IP00 — panel builders should plan for a cover or distance guarding above the terminals in the enclosure layout. Width 55 mm, height 112 mm, depth 130 mm. Side-by-side mounting is permitted, so multiple contactors can share the same DIN rail segment without a mandatory air gap — useful for compact motor control centers. Solid or stranded wire sizes for auxiliary circuits: 2x (0.75 … 16 mm²). The mechanical switching frequency at AC-3 is 1 000 operations per hour; at AC-4 it drops to 300 per hour — plan the cycle count against the application profile.","metaTitle":"Siemens 3RT1035-3BD40 SIRIUS Power Contactor, Size S2, 18.5","metaDescription":"Siemens 3RT1035-3BD40 SIRIUS power contactor, Size S2, 18.5 kW at 400 V AC-2, 22 kW at 500 V. Active production, screw terminals, DIN rail mount. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"55 mm","at DC":"20 ... 25 ms","Height":"112 mm","Stranded":"2x (0.75 ... 25 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"42 V","On The Front":"IP20","Initial Value":"0.8","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","Full-Scale Value":"1.1","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 500 V rated value":"22 kW","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":"spring-loaded terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 63 A","closing power of magnet coil at DC":"13.3 W","holding power of magnet coil at DC":"13.3 W","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 (24 ... 14)","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 (0.25 ... 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)","Thermal Short-Time Current Limited To 10 S":"400 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=282394&mlfb=3RT1035-3BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1035-3BD40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RT1035-3BD40 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ through the storefront for a firm price and lead time."},{"question":"What is the 3RT1035-3BD40's depth?","answer":"The depth is 130 mm. Combined with the 55 mm width and 112 mm height, it fits a standard 200 mm deep enclosure with room for wiring clearance."},{"question":"What compliance documentation does the 3RT1035-3BD40 carry?","answer":"The part carries a substance prohibitance date of 05/01/2012, consistent with RoHS compliance. Standard CE, UL, and CSA declarations are provided with the shipment."},{"question":"Will the 3RT1035-3BD40 drop into a panel specified around the 3RT1044-1FB46?","answer":"The 3RT1044-1FB46 is a larger frame size (S3 vs S2) with higher current ratings. The 3RT1035-3BD40 will not mechanically or electrically substitute without rewiring the main power circuit and verifying the mounting rail spacing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1035-3BD40","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/3RT1035-3BD40 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}}