{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AD20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AD20","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AD20","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AD20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT1045-1AD20, screw-type terminals, 45 kW at 500 V 50 Hz, 21.1 kW at 690 V, snap-on 35/75 mm DIN rail, IP20 front.","salesMarkdown":"## SIRIUS S3 power contactor — 45 kW at 500 V, screw terminals, snap-on DIN rail The Siemens 3RT1045-1AD20 is a SIRIUS S3 power contactor rated for 45 kW at 500 V 50 Hz and 21.1 kW at 690 V, making it the motor-switching choice for medium-horsepower induction motors in the 50–75 kW class at 400 V. The contactor snaps onto 35 mm or 75 mm standard mounting rail, and side-by-side mounting is permitted — no derating gap required between units on the rail. The AC-3 switching frequency is rated at 1 000 operations per hour maximum, which covers most conveyor and pump cycling. AC-4 (plugging/reversing) is limited to 300 ops/h — if your application jogs or reverses frequently, that's the duty cycle to watch. Mechanical life is typical 10 000 000 operations, so the contactor itself outlasts most panel refreshes. The coil operates across 0.8 to 1.1 times rated voltage at 50 Hz and 0.85 to 1.1 at 60 Hz, with pick-up time 10–25 ms and arcing time 10–15 ms — consistent with a standard AC coil contactor. Auxiliary contact ratings: 10 A at 24 V, 6 A at 230 V, 3 A at 400 V, 0.3 A at 220 V DC. The auxiliary accepts solid conductors 2x 0.5–1.5 mm² or 2x 0.75–2.5 mm², max 2x 0.75–4 mm² — standard for control wiring. The 24 V DC rating of 10 A is notably high, useful for pilot-duty control circuits without an intermediate relay. Dimensions: 146 mm height, 70 mm width, 139 mm depth. The S3 frame is the mid-size in the SIRIUS contactor family — expect to allocate roughly 150 mm of DIN rail height per unit. Screw terminals on the main circuit accept 2x 10–50 mm² stranded; auxiliary terminals accept 2x 0.5–1.5 mm² solid. Side-by-side mounting is permitted, so no spacing between units on the rail is required for thermal derating.","metaTitle":"Siemens 3RT1045-1AD20 SIRIUS Power Contactor, 45 kW at 500 V","metaDescription":"Siemens 3RT1045-1AD20 SIRIUS S3 power contactor, 45 kW at 500 V 50 Hz, 21.1 kW at 690 V. Screw terminals, snap-on 35/75 mm DIN rail. Current lifecycle stage. Sourced to order.","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","at 60 Hz":"0.85 ... 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":"42 V","at 500 V rated value":"45 kW","at 60 Hz rated value":"42 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":"27 VA","apparent pick-up power of magnet coil at AC":"298 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":"0.7","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":"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=492782&mlfb=3RT1045-1AD20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AD20/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1045-1AD20 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 3RT1045-1AD20's depth?","answer":"The listed depth is 139 mm. Overall dimensions are 146 mm height, 70 mm width, 139 mm depth."},{"question":"What solid conductor sizes does the auxiliary accept?","answer":"The auxiliary terminals accept 2x (0.5... 1.5 mm²) or 2x (0.75... 2.5 mm²) solid, with a maximum of 2x (0.75... 4 mm²)."},{"question":"Will 3RT1045-1AD20 drop into a panel specified around 3RT1044-1FB46?","answer":"The 3RT1045-1AD20 is an S3 frame contactor, while the 3RT1044-1FB46 is a different frame size. The physical footprint and terminal layout differ — verify panel cutout and DIN rail allocation before substituting. The 3RT5045-1AC20 and 3RT5045-1AF00 are also S3 frame but with different coil voltages or terminal types; check the specific variant."},{"question":"What compliance documentation does Siemens provide for 3RT1045-1AD20?","answer":"The part carries the SIRIUS brand and is designed to IEC/EN 60947-4-1 standards. Siemens typically provides RoHS and REACH declarations, CE marking, and UL/CSA certification documentation upon request through the standard compliance documentation process."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AD20","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/3RT1045-1AD20 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}}