{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AV04","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AV04","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AV04","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AV04","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AV04 power contactor, size S3, screw-type terminals, 37 kW at AC-2 400 V, 66 A AC-4, snap-on mounting.","salesMarkdown":"The 3RT1045-1AV04: The AC-2 rating of 37 kW at 400 V certifies this contactor for slip-ring motor duty — starting and stopping under load — which is the standard for wound-rotor motors in cranes, hoists, and conveyors. The AC-4 rating of 66 A at 400 V covers reversing and inching service where the motor is switched at standstill or during plugging, so the contactor's arc-chamber and contact material are sized for repeated make-and-break at locked-rotor current. The auxiliary contact ratings at 24 V (10 A), 110 V (1 A), and 220 V (0.3 A) define the control-circuit capacity for PLC inputs, relay coils, or indicator lamps. The 24 V 10 A rating is notably high — it can drive multiple small relay coils in parallel without a separate interposing relay. Side-by-side mounting is permitted, so multiple contactors can be ganged without spacing for a dense motor-control center layout. Dimensions are 146 mm height, 70 mm width, and 188 mm depth, fitting into a standard S3 footprint. IP20 on the front with cover or box terminal means the front is finger-safe once installed in an enclosure; the terminal area itself is IP00, so the panel builder must ensure no live parts are accessible during maintenance. Main circuit connections use screw-type terminals. Stranded wire is accepted from 10 mm² up to 50 mm², covering typical motor feeder sizes for the 37 kW class. For solid or ferruled conductors, the terminal accepts 2.5 mm² to 16 mm². The auxiliary circuit accepts solid wire from 0.5 mm² to 4 mm². This range covers standard control wiring (1.5 mm² or 2.5 mm²) and allows paralleling of two conductors per terminal for daisy-chaining. Storage range is -55 °C to +80 °C, which is relevant for warehousing and transport.","metaTitle":"Siemens 3RT1045-1AV04 SIRIUS Power Contactor, 37 kW AC-2","metaDescription":"Siemens SIRIUS 3RT1045-1AV04 power contactor, size S3. 37 kW at AC-2 400 V, 66 A AC-4. Screw terminals, snap-on 35/75 mm rail. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"188 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), max. 2x (0.75 ... 4 mm²)","Width":"70 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 50 Hz":"0.8 ... 1.1","Arcing Time":"10 ... 15 ms","On The Front":"IP20; IP20 on the front with cover / box terminal","1 Rated Value":"50 Hz","During Storage":"-55 ... +80 °C","Of The Terminal":"IP00","at AC-1 maximum":"900 1/h","at AC-2 maximum":"400 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 and 75 mm standard mounting rail","Size Of Contactor":"S3","Solid Or Stranded":"2x (2.5 ... 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 50 Hz rated value":"400 V","at 500 V rated value":"45 kW","at 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","at 1000 V rated value":"37 W","For Main Current Circuit":"screw-type terminals","at AC-2 at 400 V rated value":"37 kW","at AC-4 at 400 V rated value":"66 A","Substance Prohibitance (Date)":"05/01/2012","at 40 °C minimum permissible":"50 mm²","at 60 °C minimum permissible":"35 mm²","Insulation Voltage Rated Value":"1 000 V","at 230 V at 60 °C rated value":"38 kW","at 690 V at 60 °C rated value":"114 kW","at 1000 V at 60 °C rated value":"82 W","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","With Type Of Assignment 2 Required":"fuse gL/gG: 160 A","Surge Voltage Resistance Rated Value":"6 kV","With Type Of Coordination 1 Required":"fuse gL/gG: 250 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":"760 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","apparent holding power of magnet coil at AC":"22 VA","apparent pick-up power of magnet coil at AC":"270 VA","Type Of Voltage Of The Control Supply Voltage":"AC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.68","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.27","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=49590&mlfb=3RT1045-1AV04","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AV04/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"At AC-2 duty (slip-ring motors) it is rated 37 kW at 400 V. At AC-4 duty (reversing/inching) it is rated 66 A at 400 V. For AC-3 squirrel-cage starting, it handles up to 1 000 operations per hour."},{"question":"Does this contactor mount on standard DIN rail?","answer":"Yes, it mounts on both 35 mm and 75 mm standard mounting rails via screw or snap-on. Side-by-side mounting is permitted."},{"question":"What wire sizes does the main terminal accept?","answer":"Stranded wire from 10 mm² to 50 mm², and solid/ferruled wire from 2.5 mm² to 16 mm². Auxiliary terminals accept solid wire from 0.5 mm² to 4 mm²."},{"question":"What compliance documentation is available?","answer":"RoHS compliance is confirmed with a substance prohibition date of May 1, 2012. The contactor carries pollution degree 3 rating and IP20 front protection."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AV04","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/3RT1045-1AV04 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}}