{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AL20-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AL20-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AL20-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL20-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, order code 3RT1045-1AL20-ZX95, rated 45 kW at 500 V AC-3, screw-type terminals, snap-on mounting for 35/75 mm rail.","salesMarkdown":"The Siemens 3RT1045-1AL20-ZX95 is a SIRIUS power contactor in the S3 frame size, rated for 45 kW at 500 V in AC-3 duty — that's the motor-switching current class, so it handles a 45 kW induction motor on a 500 V line. Side-by-side mounting is allowed, which keeps panel width tight when you're stacking multiple contactors for a multi-motor group. Fastens with screws or snaps onto 35 mm and 75 mm standard mounting rail — that's the standard DIN-rail footprint, so it drops into any IEC panel without adapters. The main circuit uses screw-type terminals; solid wire accepts 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and up to 2x (0.75 to 4 mm²). Stranded connections go up to 2x (10 to 50 mm²). ## Duty ratings and mechanical life AC-4 (plugging/reversing) maxes at 300 ops/h. ## Dimensions and mounting clearances Height 146 mm, width 70 mm, depth 139 mm — that's the envelope for the S3 frame.","metaTitle":"Siemens 3RT1045-1AL20-ZX95 SIRIUS Power Contactor, S3, 45 kW","metaDescription":"Siemens 3RT1045-1AL20-ZX95 SIRIUS power contactor, size S3, rated 45 kW at 500 V AC-3. Screw terminals, snap-on 35/75 mm rail. Current lifecycle stage. Quoted 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":"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=116693&mlfb=3RT1045-1AL20-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL20-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT1045-1AL20-ZX95 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here."},{"question":"What is the closest functional second-source to 3RT1045-1AL20-ZX95?","answer":"The closest peer in the SIRIUS line is the 3RT5045-1AF00 or 3RT5045-1AG00 — same S3 frame, similar AC-3 ratings, but with spring-cage terminals instead of screw-type. The 3RT1044-1FB46 is a smaller S2 frame and won't match the 45 kW rating without rewiring the main power circuit."},{"question":"What is the depth of 3RT1045-1AL20-ZX95?","answer":"Listed depth is 139 mm. That's the full body depth including the arc chamber and screw terminals."},{"question":"What solid wire sizes does 3RT1045-1AL20-ZX95 accept?","answer":"Solid wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²). Stranded: 2x (10 to 50 mm²)."},{"question":"Will 3RT1045-1AL20-ZX95 drop into a panel specified around 3RT1044-1FB46 without rewiring?","answer":"No — the 3RT1044-1FB46 is an S2 frame with a different footprint and lower current rating. The S3 frame of this part is wider and deeper, so the mounting holes and bus bar positions won't align without rework."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AL20-ZX95","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-ZX95 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}}