{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-3AG14","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-3AG14","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-3AG14","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AG14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 37 kW AC-2 at 400 V, screw-type terminals, snap-on mounting for 35/75 mm rail, IP20 front.","salesMarkdown":"The 3RT1045-3AG14 is a SIRIUS power contactor in size S3, rated 37 kW at 400 V in AC-2 duty — that's the category for slip-ring motor starting, where the contactor makes and breaks the rotor circuit under load. The AC-3 rating (squirrel-cage motors) is also covered; the 1 000 cycles per hour maximum at AC-3 tells you it handles frequent starting without overheating the coil or arc chamber. Solid wire from 0.25 to 2.5 mm² (two conductors per clamp) and stranded from 10 to 50 mm² (also two per clamp). That's a wide range: the smaller solid pair covers control wiring, the larger stranded pair handles the power circuit. ## Thermal and mechanical limits The arcing time is 10 to 15 ms, and the switching frequency at AC-3 maxes out at 1 000 cycles per hour, so it's not a high-speed chopper but it's fine for normal motor starting cycles. The auxiliary contacts are rated for 24 V at 10 A, 60 V at 2 A, 110 V at 1 A, 220 V at 0.3 A, 230 V at 6 A, 400 V at 3 A — that's a mix of resistive and inductive loads. The 230 V 6 A rating is useful for a control transformer secondary; the 24 V 10 A covers PLC outputs or relay coils. No separate auxiliary block is listed here — these are the built-in contacts on the standard S3 frame.","metaTitle":"Siemens 3RT1045-3AG14 SIRIUS Power Contactor, 37 kW AC-2 at","metaDescription":"Siemens 3RT1045-3AG14 SIRIUS power contactor, size S3, 37 kW AC-2 at 400 V. Screw terminals, snap-on 35/75 mm rail. IP20 front. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"188 mm","Solid":"2x (0.25 ... 2.5 mm²)","Width":"70 mm","at AC":"10 ... 25 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","at 60 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":"60 Hz","2 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":"100 V","at 500 V rated value":"45 kW","at 60 Hz rated value":"110 V","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":"spring-loaded 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 (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":"760 A","Finely Stranded Without Core End Processing":"2x (0.25 ... 2.5 mm²)","apparent holding power of magnet coil at AC":"21 VA","apparent pick-up power of magnet coil at AC":"300 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":"0.52","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.29","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=74153&mlfb=3RT1045-3AG14","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-3AG14/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1045-3AG14 and how do I get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ for current availability and pricing — confirmed at quote time."},{"question":"What is 3RT1045-3AG14's listed depth?","answer":"The depth is 188 mm, which includes the arc chamber and terminal overhang. Check gland-plate clearance before panel layout."},{"question":"What wire sizes does the 3RT1045-3AG14 accept?","answer":"Solid wire: 2x (0.25 to 2.5 mm²). Stranded wire: 2x (10 to 50 mm²). Also accepts 2x (2.5 to 16 mm²) solid or stranded."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-3AG14","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/3RT1045-3AG14 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}}