{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2518-1BB40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2518-1BB40","canonicalUrl":"https://aoctrl.com/siemens/3RT2518-1BB40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2518-1BB40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS contactor, size S00, 24 V AC/DC coil, screw-type terminals, auxiliary switch rated 10 A at 24 V.","salesMarkdown":"It's a current-production unit, so no end-of-life surprise for a lineside spare. Side-by-side contactors need 6 mm spacing between units – no extra gap at top, bottom, front, or back (zero clearance for those planes). Wire range for main and auxiliary circuits: 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid/stranded. ## Comparison to 3RT2028-1BB40 Both are S00-frame SIRIUS contactors with 24 V screw terminals. The 3RT2518-1BB40 is the newer-generation offering; the 3RT2028-1BB40 is its direct predecessor. Mounting, wire range, and auxiliary contact capacity are identical per the published specs. If your BOM calls the older code, this one drops into the same panel slot without rewiring – but confirm the auxiliary switch count (this one includes a built-in auxiliary, the earlier may have been ordered without).","metaTitle":"Siemens 3RT2518-1BB40 SIRIUS Contactor, 24V Coil, Size S00","metaDescription":"Siemens 3RT2518-1BB40 SIRIUS contactor, 24V coil, screw terminals, size S00. Current production. Auxiliary switch rated 10A at 24V. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","Height":"57.5 mm","Upwards":"0 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"0 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 000 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","Full-Scale Value":"1.1","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":"S00","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"contactor","at 24 V rated value":"10 A","at 48 V rated value":"2 A","at 60 V rated value":"2 A","Of Contactor Typical":"30 000 000","at 110 V rated value":"1 A","at 125 V rated value":"2 A","at 220 V rated value":"0.3 A","at 230 V rated value":"10 A","at 400 V rated value":"3 A","at 440 V rated value":"0.8 A","at 600 V rated value":"0.1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","Relative Humidity Minimum":"10 %","per NC contact rated value":"9 A","per NO contact rated value":"16 A","Of Main Circuit Rated Value":"6 kV","Substance Prohibitance (Date)":"10/01/2009","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 20A (690V, 100kA)","at 24 V per NC contact rated value":"20 A","at 24 V per NO contact rated value":"20 A","closing power of magnet coil at DC":"4 W","holding power of magnet coil at DC":"4 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","at 110 V per NC contact rated value":"0.175 A","at 110 V per NO contact rated value":"0.35 A","at 220 V per NC contact rated value":"0.375 A","at 220 V per NO contact rated value":"0.75 A","at 230 V per NC contact rated value":"2.2 kW","at 230 V per NO contact rated value":"4 kW","at 400 V per NC contact rated value":"4 kW","at 400 V per NO contact rated value":"7.5 kW","With Type Of Coordination 1 Required":"gG: 35 A (690 V, 100 kA)","at AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","operational current at AC-12 maximum":"10 A","number of NC contacts for main contacts":"2","number of NO contacts for main contacts":"2","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":"4","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","at ambient temperature 40 °C rated value":"22 A","at ambient temperature 60 °C rated value":"20 A","mirror contact according to IEC 60947-4-1":"Yes; with 3RH29","Type Of Voltage Of The Control Supply Voltage":"DC","for 3-phase AC motor at 460/480 V rated value":"5 hp","for single-phase AC motor at 230 V rated value":"2 hp","Limited To 1 S Switching At Zero Current Maximum":"165 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"165 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 10 S Switching At Zero Current Maximum":"128 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 30 S Switching At Zero Current Maximum":"92 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 60 S Switching At Zero Current Maximum":"74 A; Use minimum cross-section acc. to AC-1 rated value","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.8","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Of The Contactor With Added Auxiliary Switch Block Typical":"10 000 000","Of Auxiliary Circuit With Degree Of Pollution 3 Rated Value":"690 V","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gG: 10 A","minimum cross-section in main circuit at maximum AC-1 rated value":"4 mm²","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"0","AWG number as coded connectable conductor cross section for main contacts":"20 ... 12","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000","power loss [W] at AC-3 at 400 V for rated value of the operational current per conductor":"2.2 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$44.45","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=369038&mlfb=3RT2518-1BB40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2518-1BB40/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of this contactor?","answer":"73 mm depth, 45 mm width, 57.5 mm height."},{"question":"What wire sizes does it accept?","answer":"Screw terminals accept 2x 0.5–1.5 mm², 2x 0.75–2.5 mm², or 2x 4 mm² solid or stranded."},{"question":"Will it drop into a panel designed for 3RT2028-1BB40?","answer":"Yes, same S00 frame, same mounting and wiring. Just verify the auxiliary switch configuration matches what the panel expects."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2518-1BB40","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/3RT2518-1BB40 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}}