{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT5045-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT5045-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT5045-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S3 power contactor, 24 VDC coil, screw terminals, 66 kW at 400 V, 114 kW at 690 V, DIN rail mount.","salesMarkdown":"The Siemens 3RT5045-1BB40 is a SIRIUS S3 power contactor with a 24 VDC coil, rated for motor switching up to 66 kW at 400 V and 114 kW at 690 V (at 60 °C). The S3 frame size and pollution degree 3 rating suit it for industrial control panels with moderate to heavy electrical environments. The 66 kW at 400 V and 114 kW at 690 V figures (both at 60 °C) tell you the motor load this contactor can handle in AC-3 duty — the standard for squirrel-cage induction motors. The 24 VDC coil draws 6 A at rated voltage, so confirm your control transformer or DC supply can deliver that inrush without sagging. Mechanical life is rated at 10 000 000 operations typical, with AC-3 switching frequency up to 1 000 cycles per hour — that's continuous duty for high-cycling conveyors or pump stations. Snap-on mounting onto 35 mm or 75 mm DIN rail — no tools needed for the rail, but the screw terminals for main contacts accept 2x (2.5 to 16 mm²) solid or stranded, or 2x (10 to 1/0 AWG). The auxiliary contact block is field-addable (product extension auxiliary switch is supported). ## Compliance and Coordination Substance prohibitance (RoHS) compliance date is 03/01/2017, so the part meets EU RoHS and REACH requirements for current builds. For short-circuit coordination, the required backup fuse is gL/gG 160 A — size your branch protection accordingly. Insulation voltage is rated at 1 000 V, giving headroom for 690 V systems.","metaTitle":"Siemens 3RT5045-1BB40 SIRIUS Power Contactor, 24 VDC Coil, S","metaDescription":"Siemens SIRIUS 3RT5045-1BB40 power contactor, 24 VDC coil, S3 frame. Rated 66 kW at 400 V, 114 kW at 690 V. Screw terminals, DIN rail mount. Active production. Quoted to order.","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":"24 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 DIN rail","at AC-3e maximum":"1 000 1/h","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","at AC-3e rated value maximum":"1 000 V","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","for 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","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 1x 12","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=580037&mlfb=3RT5045-1BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT5045-1BB40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT5045-1BB40 and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the latest position."},{"question":"Will 3RT5045-1BB40 drop into a panel specified for 3RT5045-1AF00 without rewiring?","answer":"Both are SIRIUS S3 contactors on the same frame, so the physical footprint and DIN rail mounting are identical. The difference is the coil voltage: 3RT5045-1BB40 uses a 24 VDC coil, while 3RT5045-1AF00 uses a different coil voltage. If your control circuit is 24 VDC, it's a direct mechanical swap — no rewiring of the power terminals needed."},{"question":"What compliance documentation does Siemens provide for 3RT5045-1BB40?","answer":"RoHS compliance is confirmed with a substance prohibitance date of 03/01/2017, covering EU RoHS and REACH. The insulation voltage rating of 1 000 V and pollution degree 3 support IEC 60947-4-1 compliance for power contactors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT5045-1BB40","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/3RT5045-1BB40 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}}