{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AL20-ZW96","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AL20-ZW96","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AL20-ZW96","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL20-ZW96","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S3, order code 3RT1045-1AL20-ZW96, rated 45 kW at 500 V AC-3, screw-type terminals, 70 mm width, IP20 front protection.","salesMarkdown":"## What this SIRIUS Size S3 contactor does It carries a 45 kW rating at 500 V AC-3, which is the standard duty for squirrel-cage motors — that's the number that matters for sizing a motor starter. At 690 V AC-3 it's rated 21.1 kW, so the same contactor can handle a higher-voltage motor at reduced power. At 70 mm wide and 146 mm tall, it fits a standard 8-module DIN-rail slot — no surprises for the panel builder laying out a row of starters. Termination is screw-type on the main current circuit, accepting solid conductors up to 4 mm² on the control side and stranded up to 50 mm² on the power side. That covers most motor feeds up to 45 kW without needing lug adapters. ## Duty cycle and thermal limits The electrical endurance depends on the duty category: AC-3 allows up to 1,000 switching cycles per hour, while AC-4 (plugging/inching) drops to 300 cycles per hour. For resistive loads (AC-1) it's 900 cycles per hour. The front is IP20 with the cover/box terminal installed; the terminal area itself is IP00, so live parts are exposed when the panel door is open. The coil operates on 50/60 Hz with a voltage tolerance of 0.8 to 1.1 times rated at 50 Hz and 0.85 to 1.1 at 60 Hz. That's a standard ±20% / +10% range — the coil will pick up reliably even if the control transformer sags under load. The contactor is rated for 24 V DC auxiliary switching at 10 A, stepping down to 0.3 A at 220 V DC. That covers most PLC output cards and relay interfaces. For AC auxiliary loads at 230 V it's rated 6 A, and at 400 V it's 3 A.","metaTitle":"Siemens 3RT1045-1AL20-ZW96 SIRIUS Power Contactor, Size S3,","metaDescription":"Siemens 3RT1045-1AL20-ZW96 SIRIUS power contactor, Size S3, rated 45 kW at 500 V AC-3. Screw terminals, 70 mm wide, IP20 front. Current lifecycle stage. Available to order against","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":"230 V","at 500 V rated value":"45 kW","at 60 Hz rated value":"230 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=383183&mlfb=3RT1045-1AL20-ZW96","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL20-ZW96/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1045-1AL20-ZW96?","answer":"The 3RT5045-1AF00 and 3RT5045-1AC20 are SIRIUS contactors in the same Size S3 frame, but they use spring-cage terminals instead of screw terminals. The 3RT1044-1FB46 is a smaller Size S2 contactor — it won't drop into the same panel layout without rewiring and has a lower current rating. For a direct screw-terminal replacement in Size S3, the 3RT1045-1AL20-ZW96 is the correct fit."},{"question":"What are the mounting dimensions for 3RT1045-1AL20-ZW96?","answer":"Width is 70 mm, height 146 mm, depth 139 mm. It mounts on 35 mm or 75 mm standard DIN rail via screw and snap-on fastening."},{"question":"Where can I buy 3RT1045-1AL20-ZW96?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AL20-ZW96","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/3RT1045-1AL20-ZW96 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}}