{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1XF00-0GA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1XF00-0GA0","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1XF00-0GA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1XF00-0GA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, size S3, 3RT1045-1XF00-0GA0, 37 kW at 400 V AC-2, screw terminals, IP20 front.","salesMarkdown":"At 500 V it carries 45 kW, and at 690 V it carries 21.1 kW, so the same unit covers 400 V and 690 V line supplies without derating the motor frame. The main current circuit uses screw-type terminals, accepting stranded conductors from 10 to 50 mm². That terminal range covers most motor branch circuits up to 45 kW without needing adapter lugs. The front face carries an IP20 rating with the cover or box terminal installed, which meets the finger-safe requirement for operator-access areas. The terminal body itself is IP00, so keep that inside the enclosure. ## Switching performance and life Maximum switching frequency varies by duty: 900 cycles/hour at AC-1 (resistive), 1000 cycles/hour at AC-3 (squirrel-cage motor start/run), and 300 cycles/hour at AC-4 (plugging or inching). The AC-3 rate of 1000 cycles/hour is the one you'll reference for most conveyor or pump cycling — it's fast enough for frequent start-stop sequences without exceeding the thermal limit. Arcing time is 10 to 15 ms, and the contactor withstands shock at 10.6 g for 5 ms and 6.2 g for 10 ms on AC. DC dropout delay runs 14 to 20 ms — relevant if you're coordinating with a safety relay or PLC output that needs to see the contactor drop within a known window.","metaTitle":"Siemens 3RT1045-1XF00-0GA0 SIRIUS Power Contactor, S3, 37 kW","metaDescription":"Siemens SIRIUS 3RT1045-1XF00-0GA0 power contactor, size S3, rated 37 kW at 400 V AC-2 and 45 kW at 500 V. Screw terminals, IP20 front. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 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":"10.6g / 5 ms, 6.2g / 10 ms","at DC":"14 ... 20 ms","Height":"176 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","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":"110 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","Design Of The Surge Suppressor":"with varistor","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":"23.5 VA","apparent pick-up power of magnet coil at AC":"23.5 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":"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=265935&mlfb=3RT1045-1XF00-0GA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1XF00-0GA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor ratings for this contactor?","answer":"AC-2 duty: 37 kW at 400 V, 45 kW at 500 V, 21.1 kW at 690 V. AC-3 rating is also available but the AC-2 figure is the one that governs wound-rotor motor applications."},{"question":"What wire sizes does the main circuit accept?","answer":"Stranded conductors from 10 to 50 mm² on the screw terminals. Auxiliary contacts accept solid wire from 0.5 to 4 mm²."},{"question":"Can this contactor be mounted side-by-side with others?","answer":"Yes, side-by-side mounting is permitted. It snaps onto 35 mm or 75 mm DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1XF00-0GA0","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/3RT1045-1XF00-0GA0 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}}