{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1045-1BP40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1045-1BP40","canonicalUrl":"https://aoctrl.com/siemens/3RT1045-1BP40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BP40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, power contactor, 3RT1045-1BP40, S3 frame, 37 kW at 400 V AC-2, 66 A at 400 V AC-4, screw terminals, DIN-rail mount.","salesMarkdown":"Its AC-2 rating of 37 kW at 400 V means it handles slip-ring motor duty cycles reliably, while the AC-4 rating of 66 A at 400 V covers reversing and inching applications where the contactor makes and breaks full motor current. The screw-type terminals on the main current circuit accept solid conductors from 0.5 mm² up to 4 mm² (double ferruled) and stranded conductors up to 50 mm², covering most motor feeder sizes through the S3 frame. Arcing time runs 10 to 15 ms, dropout time at DC is 14 to 20 ms. Maximum switching rates vary by duty: 900 cycles/hour at AC-1, 400 at AC-2, 1,000 at AC-3, and 300 at AC-4. The coil pickup and dropout thresholds are 0.8 x Uc and 1.1 x Uc respectively.","metaTitle":"Siemens 3RT1045-1BP40 SIRIUS Power Contactor, 37 kW AC-2","metaDescription":"Siemens SIRIUS 3RT1045-1BP40 power contactor, S3 frame, 37 kW at 400 V AC-2, 66 A AC-4. Screw terminals, DIN-rail mount. Current 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 DC":"14 ... 20 ms","Height":"146 mm","Stranded":"2x (10 ... 50 mm²)","Arcing Time":"10 ... 15 ms","Rated Value":"230 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=48315&mlfb=3RT1045-1BP40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1045-1BP40/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source to 3RT1045-1BP40?","answer":"The 3RT1044-1FB46 is a smaller S2 frame contactor with lower ratings — it will not drop into a panel specified around the S3 3RT1045-1BP40 without checking the mounting footprint and current capacity."},{"question":"What is the depth of 3RT1045-1BP40?","answer":"The depth is 152 mm."},{"question":"What solid wire sizes does 3RT1045-1BP40 accept?","answer":"The screw terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), and max 2x (0.75 to 4 mm²)."},{"question":"What compliance documentation does Siemens provide for 3RT1045-1BP40?","answer":"RoHS compliance is documented with a substance prohibition date of May 1, 2012. The product carries IP20 front protection and is rated for pollution degree 3 per IEC standards."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT1045-1BP40","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/3RT1045-1BP40 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}}