{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AK68-0PA4","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AK68-0PA4","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AK68-0PA4","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AK68-0PA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AK68-0PA4 power contactor, size S3, screw-type terminals, 45 kW at 500 V AC-3, snap-on mounting, 70 x 146 x 188 mm.","salesMarkdown":"The Siemens SIRIUS 3RT1045-1AK68-0PA4 is a size S3 power contactor rated for motor switching up to 45 kW at 500 V in AC-3 duty, with a mechanical life of 10 million cycles typical. The AC-3 rating of 45 kW at 500 V is the key selection figure for motor starting — it tells you this contactor can handle the inrush and break the running current of a standard squirrel-cage induction motor up to that power. At 690 V the same duty drops to 21.1 kW, which is the derating you need to account for when the line voltage is higher. The AC-1 resistive rating isn't listed as a single current, but the maximum operating rate of 900 operations per hour under AC-1 gives a sense of its thermal cycling capability for heater or lighting loads. For the control circuit, the contactor's coil draw at 24 V is 10 A — that's the inrush, not the hold, so size your PLC output or interposing relay for that peak. At 230 V the coil draw drops to 6 A, and at 400 V it's 3 A. The arcing time across the main poles runs 10 to 25 ms at AC, with a narrower window of 10 to 15 ms typical, which matters for coordinating upstream fuse or breaker clearing curves. ## Mounting and Wiring Integration Dimensions are 70 mm wide, 146 mm high, 188 mm deep — the S3 frame fits a standard DIN-rail envelope. Side-by-side mounting is permitted with no derating gap, so you can pack several contactors on a rail for multi-motor groups. The main circuit accepts solid conductors up to 2x (0.5 to 1.5 mm²) and 2x (0.75 to 2.5 mm²), with a maximum of 2x (0.75 to 4 mm²) for the smaller terminals; stranded goes up to 2x (10 to 50 mm²) on the power side. Front IP20 with a cover or box terminal keeps fingers out; the terminal body itself is IP00, so the panel enclosure provides the overall ingress protection.","metaTitle":"Siemens 3RT1045-1AK68-0PA4 SIRIUS Power Contactor, S3, 45 kW","metaDescription":"Siemens SIRIUS 3RT1045-1AK68-0PA4 power contactor, size S3, rated 45 kW at 500 V AC-3. Screw terminals, snap-on DIN rail mount. Current lifecycle stage, sourced to order. Request R","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","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":"50 Hz","2 Rated Value":"60 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":"110 V","at 500 V rated value":"45 kW","at 60 Hz rated value":"120 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":"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":"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":"1","number of NO contacts for auxiliary contacts instantaneous contact":"1","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=200335&mlfb=3RT1045-1AK68-0PA4","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AK68-0PA4/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1045-1AK68-0PA4?","answer":"The 3RT1044-1FB46 is a size S2 contactor from the same SIRIUS family, but it's a smaller frame — it won't drop into the same panel footprint without rewiring the mounting rail and re-terminating the power cables. The 3RT5045-1AF00 and 3RT5045-1AG00 are S3 frame contactors with similar ratings but use spring-cage terminals instead of screw-type, so the wiring method differs. For a direct mechanical and electrical swap, stick with the 3RT1045-1AK68-0PA4."},{"question":"Where can I buy 3RT1045-1AK68-0PA4?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm offer."},{"question":"What are the key dimensions of 3RT1045-1AK68-0PA4?","answer":"Width is 70 mm, height is 146 mm, and depth is 188 mm — the S3 frame size for DIN-rail mounting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AK68-0PA4","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/3RT1045-1AK68-0PA4 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}}