{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1AL24","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1AL24","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1AL24","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL24","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1AL24 power contactor, S3 frame, 45 kW at 500 V AC-3, screw-type terminals, 24 V DC coil, DIN rail mount.","salesMarkdown":"Its headline rating is 45 kW at 500 V under AC-3 duty (cite:), which means it handles the inrush and breaking of squirrel-cage motors up to that power level — the rating that governs real-world motor switching, not the higher resistive-load figure. The 24 V DC coil (cite:) draws 10 A at rated voltage, so verify your control transformer and fuse sizing against that pickup current. Mechanical endurance is listed at 10,000,000 operations typical (cite:), which for a contactor on a conveyor or pump running 100 cycles per hour gives about 11 years of service before mechanical wear becomes a concern. The AC-3 maximum switching rate of 1,000 operations per hour (cite:) sets the thermal limit for the arc chamber — sustained cycling above that rate accelerates contact erosion. The S3 frame occupies 70 mm width, 146 mm height, and 188 mm depth (cite:,) — check your backpanel gland plate clearance, especially if the contactor sits near the enclosure wall. Side-by-side mounting is permitted (cite:), which saves rail space but requires attention to thermal derating if multiple contactors are ganged without spacing. Main circuit connections are screw-type terminals (cite:). Solid wire capacity is 2x (0.5... 1.5 mm²) and 2x (0.75... 2.5 mm²), max 2x (0.75... 4 mm²) (cite:); stranded accepts 2x (10... 50 mm²) (cite:). The IP20 rating on the front with cover or box terminal (cite:) means the contactor is finger-safe from the front but not sealed — suitable for enclosed panels, not washdown zones.","metaTitle":"Siemens 3RT1045-1AL24 SIRIUS Power Contactor, 45 kW at 500 V","metaDescription":"Siemens SIRIUS 3RT1045-1AL24 power contactor, S3 size, 45 kW at 500 V AC-3. Active production. Screw terminals, DIN rail mount, IP20 front. Sourced to order via 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","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":"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=40139&mlfb=3RT1045-1AL24","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1AL24/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"The AC-3 motor rating is 45 kW at 500 V (cite:). At 690 V it is rated for 21.1 kW (cite:). These are the figures that determine fit for a given motor load — use the AC-3 value, not the resistive AC-1 rating, when sizing for induction motors."},{"question":"What is the operating temperature range?","answer":"During operation it is rated from -25 °C to +60 °C (cite:). Storage range is -55 °C to +80 °C (cite:). The operating limit matters for panel ambient; if your enclosure hits 60 °C internal, the contactor is still in spec without derating."},{"question":"Does this contactor mount on standard DIN rail?","answer":"Yes, it fastens via screw or snap-on onto 35 mm and 75 mm standard mounting rails (cite:). Side-by-side mounting is allowed (cite:), which is useful for multi-contactor motor starter assemblies."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1AL24","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/3RT1045-1AL24 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}}