{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AH00","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AH00","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AH00","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AH00","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AH00 power contactor, size S3, 37 kW AC-2 at 400 V, 45 kW AC-3 at 500 V, 66 A AC-4 at 400 V, screw terminals, DIN-rail mount.","salesMarkdown":"It mounts on 35 mm or 75 mm standard DIN rails via screw or snap-on fastening, so it integrates into existing panel layouts without custom bracketry. Rated for AC-2 duty at 37 kW at 400 V, this contactor handles wound-rotor motor loads where starting current is moderate. The AC-3 rating of 45 kW at 500 V covers standard squirrel-cage motors, and the AC-4 rating of 66 A at 400 V handles plugging and inching duty cycles. For standard induction motors, the AC-3 rating of 45 kW at 500 V is the one to check against your motor nameplate. If your application cycles motors in reverse or does frequent inching, this is the rating that governs contact life. IP20 on the front with cover or box terminal means the front face is finger-safe once installed in an enclosure; the terminal area itself is IP00, so the contactor must be housed in a panel with proper guarding. Solid wire accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or max 2x (0.75 to 4 mm²). Stranded wire accepts 2x (10 to 50 mm²). This range covers control wiring through motor feeders, so you won't need adapters for mixed wire sizes. Dimensions are 146 mm high, 70 mm wide, 139 mm deep — the S3 frame size is a standard footprint that fits alongside other SIRIUS components on the same DIN rail without side clearance issues, since side-by-side mounting is permitted.","metaTitle":"Siemens 3RT1045-1AH00 SIRIUS Power Contactor, 37 kW AC-2 at","metaDescription":"Siemens 3RT1045-1AH00 SIRIUS power contactor, size S3, 37 kW AC-2 at 400 V, 45 kW AC-3 at 500 V, 66 A AC-4 at 400 V. Screw terminals, DIN-rail mount. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"139 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":"48 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":"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=372115&mlfb=3RT1045-1AH00","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AH00/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does the 3RT1045-1AH00 accept?","answer":"Solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), max 2x (0.75 to 4 mm²). Stranded wire: 2x (10 to 50 mm²). Terminals are screw-type."},{"question":"What are the mounting dimensions?","answer":"Height 146 mm, width 70 mm, depth 139 mm. Mounts on 35 mm or 75 mm DIN rail via screw or snap-on. Side-by-side mounting is permitted."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AH00","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/3RT1045-1AH00 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}}