{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AP04-3MA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AP04-3MA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AP04-3MA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AP04-3MA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S3, 3RT1045-1AP04-3MA0, screw-type terminals, 66 A at AC-4 / 400 V, IP20 front, 70 x 146 x 188 mm.","salesMarkdown":"## SIRIUS S3 power contactor — 66 A AC-4, screw terminals, current production It carries a 66 A rated operational current at AC-4 / 400 V, which is the severe-duty category for plugging and inching — frequent make-and-break of stalled or reversing motors. At AC-2 duty (slip-ring motors, starting only) the contactor is rated 37 kW at 400 V. At AC-4 — the category that matters for reversing, inching, and plugging — it delivers 66 A at 400 V. For direct-on-line starting (AC-3), the motor ratings are 45 kW at 500 V and 21.1 kW at 690 V. The 500 V figure is the higher power point; the 690 V figure reflects the voltage derate typical of this frame. Mechanical life is listed at 10 million operations typical. Maximum switching rates vary by duty: 1 000 cycles/hour at AC-3, 900 at AC-1, 400 at AC-2, and 300 at AC-4. The AC-4 rate is the limiting one for high-duty-cycle reversing applications. Main current circuit connections use screw-type terminals. The main circuit accepts stranded conductors from 2x 10 mm² up to 2x 50 mm². The auxiliary/control circuit accepts solid conductors: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or max 2x (0.75... 4 mm²). The control coil operates at 50 Hz, with a rated control supply voltage of 230 V at that frequency. For a BOM-line commitment, the AC-4 current rating and frame size are the fit-critical parameters that confirm this contactor matches the original specification.","metaTitle":"Siemens 3RT1045-1AP04-3MA0 SIRIUS Power Contactor, S3, 66 A","metaDescription":"Siemens SIRIUS 3RT1045-1AP04-3MA0 power contactor, Size S3, rated 66 A at AC-4 / 400 V. Screw terminals, IP20 front. Current production. Sourced to order against RFQ.","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":"230 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=287645&mlfb=3RT1045-1AP04-3MA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AP04-3MA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1045-1AP04-3MA0 and get a price?","answer":"This part is sourced to order against an RFQ through independent industrial-automation distribution. Submit a quote request; availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional alternative to 3RT1045-1AP04-3MA0?","answer":"The peer 3RT1044-1FB46 is a smaller frame (S2) with a lower AC-4 current rating. The 3RT5045-1AF00 and 3RT5045-1AC20 are SIRIUS 3RT5 series contactors with electronic coil drivers and different control voltages. None are a direct drop-in without reviewing the coil voltage and terminal layout."},{"question":"What is the depth of 3RT1045-1AP04-3MA0?","answer":"The depth is 188 mm from the mounting surface to the front of the contactor."},{"question":"What solid conductor sizes does the control circuit accept?","answer":"The control terminals accept 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), or a maximum of 2x (0.75... 4 mm²) solid wire."},{"question":"Will 3RT1045-1AP04-3MA0 drop into a panel specified for 3RT1044-1FB46?","answer":"No — the 3RT1045 is frame size S3 (70 mm wide) while the 3RT1044 is frame size S2 (55 mm wide). The DIN-rail footprint is different, and the terminal arrangements differ. Panel modifications or a different mounting adapter would be required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AP04-3MA0","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/3RT1045-1AP04-3MA0 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}}