{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2518-1BW40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2518-1BW40","canonicalUrl":"https://aoctrl.com/siemens/3RT2518-1BW40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2518-1BW40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2518-1BW40 contactor, Size S00, 24 VDC coil, screw-type terminals, 45 mm width, snap-on DIN rail mounting.","salesMarkdown":"The Siemens SIRIUS 3RT2518-1BW40 is a Size S00 contactor with a 24 VDC coil, screw-type terminals for the main circuit, and a 45 mm width that snaps onto a standard 35 mm DIN rail per DIN EN 50022. Rated for a 24 VDC coil, it switches DC loads up to 10 A at 24 V, 2 A at 48 V or 60 V, and handles 10 A at 230 V AC — so it's suited for control transformers, small motor loads, and resistive heating elements in a panel. The S00 frame keeps the footprint tight at 57.5 mm high and 73 mm deep, leaving room for auxiliary contact blocks alongside. The DC switching table tells you the real story: at 24 V it's good for 10 A, but at 220 V DC that drops to 0.3 A, and at 600 V DC it's only 0.1 A. That's the arc-quenching limit of a contactor this size — don't expect it to break a 600 VDC motor circuit at full current. Side-by-side mounting is allowed with zero clearance on all sides except 6 mm sideways spacing for heat dissipation. Terminals accept solid or stranded wire: 2x 0.5 to 1.5 mm², 2x 0.75 to 2.5 mm², or 2x 4 mm² — covers most control wiring you'll run in a panel.","metaTitle":"Siemens SIRIUS 3RT2518-1BW40 Contactor, S00 Frame, 45 mm","metaDescription":"Siemens SIRIUS 3RT2518-1BW40 contactor, Size S00, 45 mm wide, screw terminals, 24 VDC coil. Active production. Sourced to order. Get a quote.","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":"48 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)","operational current at AC-12 maximum":"10 A","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","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":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/be057b26367f4bac8824c3689e2fd04c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=181457&mlfb=3RT2518-1BW40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2518-1BW40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2518-1BW40 and how do I get a price?","answer":"This contactor is sourced to order against an RFQ through independent distribution. Submit a request for quote (RFQ) and we'll confirm current availability and pricing at that time."},{"question":"What is the closest functional second-source to 3RT2518-1BW40?","answer":"The 3RT2526-1BE40 is a larger frame (S0 vs S00) with a 24 VDC coil but higher current ratings. It will not drop into the same DIN footprint without panel rework — the S0 frame is wider. For a same-frame swap, stick with the S00 family."},{"question":"What compliance documentation does this brand provide for 3RT2518-1BW40?","answer":"Siemens SIRIUS contactors typically carry CE, UL, CSA, and IEC certifications, and RoHS/REACH declarations are available through the manufacturer's documentation portal. The exact certs for this order code should be confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2518-1BW40","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/3RT2518-1BW40 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}}