{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1BD40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1BD40","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1BD40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BD40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1045-1BD40 power contactor, size S3, screw-type terminals, 45 kW at 500 V AC-3, 37 kW at 400 V AC-2, snap-on mounting onto 35/75 mm rail.","salesMarkdown":"The 3RT1045-1BD40: The main current circuit uses screw-type terminals, accepting stranded conductors from 2x (10... 50 mm²) and solid conductors in multiple ranges: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and max. 2x (0.75... 4 mm²). Auxiliary contacts are rated 10 A at 24 V, 2 A at 60 V, 1 A at 110 V, and 0.3 A at 220 V — these are the switching capacities for control circuits, not the main power path. Dimensions are 146 mm height, 70 mm width, and 152 mm depth — the depth is the dimension that extends into the enclosure, so a 200 mm deep panel leaves roughly 48 mm behind the contactor for wiring and bending radius. Front protection is IP20 with the cover or box terminal installed; the terminal area itself is IP00. Maximum switching frequency varies by duty: 900 cycles/hour at AC-1 (resistive), 400 at AC-2, 1000 at AC-3, and 300 at AC-4.","metaTitle":"Siemens 3RT1045-1BD40 SIRIUS Power Contactor, 45 kW at 500 V","metaDescription":"Siemens SIRIUS 3RT1045-1BD40 power contactor, size S3, 45 kW at 500 V AC-3, 37 kW at 400 V AC-2. Screw terminals, snap-on 35/75 mm rail. Active production. RoHS compliant.","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 DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"42 V","On The Front":"IP20; IP20 on the front with cover / box terminal","Initial Value":"0.8","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","Full-Scale Value":"1.1","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 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","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","closing power of magnet coil at DC":"15 W","holding power of magnet coil at DC":"15 W","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)","Type Of Voltage Of The Control Supply Voltage":"DC","Required Spacing For Grounded Parts At The Side":"6 mm","contact rating of auxiliary contacts according to UL":"A600 / Q600","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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=152074&mlfb=3RT1045-1BD40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BD40/alternatives.json"},"ai":{"faq":[{"question":"What are the key motor power ratings for this contactor?","answer":"The 3RT1045-1BD40 is rated 45 kW at 500 V in AC-3 duty (standard motor starting), 37 kW at 400 V in AC-2 duty (slip-ring motor starting), and 66 A at 400 V in AC-4 duty (jogging/inching). For 690 V applications, the rating is 21.1 kW."},{"question":"What wire sizes does the screw terminal accept?","answer":"The main circuit terminals accept stranded conductors from 2x (10... 50 mm²) and solid conductors in multiple ranges: 2x (0.5... 1.5 mm²), 2x (0.75... 2.5 mm²), and max. 2x (0.75... 4 mm²)."},{"question":"What is the physical size and mounting method?","answer":"Dimensions are 146 mm height, 70 mm width, and 152 mm depth. It mounts via screw or snap-on onto 35 mm and 75 mm standard mounting rails, and side-by-side mounting is permitted without thermal derating."},{"question":"What compliance documentation is available?","answer":"The contactor is RoHS compliant with a substance prohibition date of May 1, 2012. It carries IP20 front protection with cover/box terminal and is rated for pollution degree 3 environments."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1BD40","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/3RT1045-1BD40 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}}