{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5045-1BM40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5045-1BM40","canonicalUrl":"https://aoctrl.com/siemens/3RT5045-1BM40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BM40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 3RT5045-1BM40, 70 mm width, screw-type terminals, 21.1 kW at 690 V, snap-on mounting.","salesMarkdown":"## SIRIUS S3 power contactor — 3RT5045-1BM40 The Siemens 3RT5045-1BM40 is a SIRIUS S3 power contactor, screw-type terminals on main and auxiliary circuits, rated for motor loads up to 21.1 kW at 690 V. It snaps onto standard 35 mm or 75 mm DIN rail — no adapter plate needed. The 690 V motor rating of 21.1 kW is the AC-3 switching capacity — that's the real-world figure for induction motor starts. The insulation voltage is rated 1 000 V, giving headroom in 690 V systems. For short-circuit protection the spec calls for a gL/gG fuse rated 160 A (type of assignment 2) — that's the coordination point for your selectivity study. ## Panel integration Screw-type terminals on both main and control circuits — accepts 2x (2.5 to 16 mm²) solid/stranded or 2x (10 to 1/0 AWG). Strip length per standard practice; torque values are on the terminal marking. The contactor accepts an auxiliary switch add-on (product extension auxiliary switch = yes), so you can add feedback contacts without changing the base unit.","metaTitle":"Siemens 3RT5045-1BM40 SIRIUS Power Contactor S3, 70 mm","metaDescription":"Siemens 3RT5045-1BM40 SIRIUS S3 power contactor, 70 mm wide, screw terminals, rated 21.1 kW at 690 V. Current lifecycle stage. Sourced to order — RFQ for availability.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Width":"70 mm","at DC":"1 000 1/h","Height":"146 mm","Rated Value":"220 V","During Storage":"-55 ... +80 °C","at AC-1 maximum":"900 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","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","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":"6 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 690 V rated value":"21.1 kW","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Substance Prohibitance (Date)":"03/01/2017","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 400 V at 60 °C rated value":"66 kW","at 690 V at 60 °C rated value":"114 kW","at AWG cables for main contacts":"2x (10 ... 1/0)","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","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","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)","at ambient temperature 40 °C rated value":"120 A","at ambient temperature 60 °C rated value":"100 A","Finely Stranded Without Core End Processing":"2x (10 ... 35 mm²)","Type Of Voltage Of The Control Supply Voltage":"DC","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b5bc68021940bf70d8764e5d5dee911e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580039&mlfb=3RT5045-1BM40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BM40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT5045-1BM40?","answer":"The depth is 152 mm, width 70 mm, height 146 mm."},{"question":"Will 3RT5045-1BM40 drop into a panel wired for 3RT5046-1BM40?","answer":"Both are SIRIUS S3 contactors with the same mounting footprint — 35/75 mm DIN rail, same screw terminal layout. The 3RT5046-1BM40 is a higher-current variant; wiring gauges sized for that model will exceed what the 3RT5045-1BM40 terminals accept (2x 16 mm² max solid). No rewiring of the DIN rail or mounting holes needed, but check the conductor size against the terminal capacity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5045-1BM40","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/3RT5045-1BM40 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}}