{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1035-1BW44","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1035-1BW44","canonicalUrl":"https://aoctrl.com/siemens/3RT1035-1BW44","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1035-1BW44","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT1035-1BW44, S2 size, 48 VDC coil, screw-type terminals, 22 kW at 500 V AC-3, 35 A at 400 V AC-4, IP20 front / IP00 terminals.","salesMarkdown":"## SIRIUS S2 Power Contactor, 48 VDC Coil It carries a 48 VDC coil rated for continuous duty, with a pickup threshold of 0.8x rated voltage and dropout at 1.1x rated voltage — meaning the coil pulls in reliably at 38.4 V and drops out at 52.8 V, giving a clean margin against brownout conditions on a 48 V control bus. Rated for 22 kW at 500 V in AC-3 duty (squirrel-cage motors) and 18.5 kW at 400 V in AC-2 duty (slip-ring motors), this contactor handles the majority of 20–30 hp motor starts in a 400 V or 480 V plant. The front face carries IP20 finger protection; the terminals are IP00, meaning the wiring compartment must be inside a closed panel or enclosure. Main current circuit terminals are screw-type, accepting stranded conductors from 2x 0.75 mm² up to 2x 25 mm², and solid conductors from 2x 0.5 mm² up to 2x 4 mm². The minimum permissible cross-section at 40 °C ambient is 16 mm² for the main circuit — a useful detail when sizing branch feeders for a 22 kW motor on a hot panel floor. Coil terminals accept 2x 0.75 to 2x 2.5 mm² solid or stranded, with a strip length appropriate for screw-clamp termination. The 55 mm width and 112 mm height fit the standard S2 footprint, and the 179 mm depth leaves clearance for wiring ducts and finger-safe covers in a 200 mm deep enclosure. Compliance documentation includes RoHS conformity dated to 05/01/2012 (substance prohibitance date), and the product carries the usual Siemens CE, UL, and CSA certifications for the SIRIUS contactor family. ## Switching Performance and Life Electrical life varies by duty: AC-1 (resistive) allows up to 1,200 switching cycles per hour, AC-3 (motor start) allows 1,000 cycles/hour, and AC-4 (plugging/inching) is limited to 300 cycles/hour due to the higher arc energy at each break. Arcing time is 10 to 15 ms, and DC operating time (pickup + dropout) is 20 to 25 ms — fast enough for most PLC-controlled sequences but worth noting if the contactor is used in a time-critical safety circuit where the total break time must be under 50 ms. ## Environmental Range The wide storage range is typical for SIRIUS contactors and allows the part to be kept in unheated warehouses or shipped in cold climates without damage.","metaTitle":"Siemens 3RT1035-1BW44 SIRIUS Power Contactor, 48 VDC Coil, S","metaDescription":"Siemens 3RT1035-1BW44 SIRIUS power contactor, 48 VDC coil, S2 size. Rated 22 kW at 500 V AC-3, 35 A at 400 V AC-4. Screw terminals, DIN rail mount. Active production. Quoted to ord","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"179 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 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":"48 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":"screw-type 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 (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)","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":"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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=26545&mlfb=3RT1035-1BW44","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1035-1BW44/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1035-1BW44 and what is the lead time?","answer":"This contactor is available to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price."},{"question":"What are the key ratings for 3RT1035-1BW44?","answer":"The contactor is rated 22 kW at 500 V AC-3, 18.5 kW at 400 V AC-2, and 35 A at 400 V AC-4. The coil is 48 VDC with a pickup threshold of 0.8x and dropout at 1.1x rated voltage."},{"question":"What compliance documentation does Siemens provide for 3RT1035-1BW44?","answer":"RoHS conformity is dated 05/01/2012. The SIRIUS contactor family carries CE, UL, and CSA certifications, and the part is rated pollution degree 3 for industrial environments."},{"question":"Will 3RT1035-1BW44 drop into a panel specified for 3RT1044-1FB46?","answer":"No — the 3RT1044-1FB46 is a larger frame (S3 vs S2) with higher current ratings and a different mounting footprint. The 3RT1035-1BW44 will not physically interchange without panel modifications."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1035-1BW44","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/3RT1035-1BW44 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}}