{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2518-2BF40","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2518-2BF40","canonicalUrl":"https://aoctrl.com/siemens/3RT2518-2BF40","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2518-2BF40","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS S00 contactor, 3RT2518-2BF40, 110 VDC coil, spring-type terminals, 45 mm width, 73 mm depth, 70 mm height.","salesMarkdown":"It's built for panel integration — screws onto the backplate or snaps onto 35 mm DIN rail per EN 50022, and the mounting position is flexible: ±180° rotation on a vertical surface, plus ±22.5° tilt forward or backward. That means it fits into tight enclosures where you need to orient the contactor around busbars or duct. This contactor is rated for DC switching across a range of voltages, and the current capability drops sharply as voltage rises — that's the physics of DC arc extinction. At 24 VDC it handles 10 A; at 48 V and 60 V it's rated 2 A; at 110 V it's 1 A; at 220 V it drops to 0.3 A; and at 600 V it's only 0.1 A. The arcing time is 10-15 ms, and the DC switching frequency is 7-13 ms. If you're switching a 24 VDC solenoid bank or a small DC motor brake, the 10 A rating gives you headroom. For a 110 VDC control circuit pulling 0.5 A, you're fine. But don't spec this for a 600 VDC string — the 0.1 A limit means it's really just for signal-level switching at that voltage. ## AC Switching and Mechanical Life The maximum mechanical switching frequency is 10,000 operations per hour, and at AC-1 resistive load it's 1,000 per hour. For a conveyor line cycling once every 30 seconds, that's about 28 years of service before the mechanism wears out. The coil pickup is at 80% of rated voltage (88 VDC for this 110 V unit), and the dropout threshold is 1.1 times the full-scale value — so it holds in well but drops cleanly when the control signal goes away. ## Integration and Clearance The contactor is 45 mm wide, 70 mm high, and 73 mm deep — a standard S00 footprint. Zero clearance needed above, below, forward, or backward.","metaTitle":"Siemens 3RT2518-2BF40 SIRIUS Contactor, S00, 110 VDC Coil, S","metaDescription":"Siemens 3RT2518-2BF40 SIRIUS contactor, size S00, 110 VDC coil, spring-type terminals. Rated for 10 A at 24 VDC, 10 A at 230 VAC. Current lifecycle stage. Sourced to order. Request","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"2x (0.5 ... 4 mm²)","Width":"45 mm","at AC":"10 000 1/h","at DC":"7 ... 13 ms","Height":"70 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":"110 V","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-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 standard mounting 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 ... 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":"spring-loaded 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","at AWG cables for main contacts":"2x (20 ... 12)","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"spring-loaded 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":"Spring-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 ... 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 ... 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","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=393827&mlfb=3RT2518-2BF40","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2518-2BF40/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2518-2BF40 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time — no stock or price figures published here."},{"question":"Will 3RT2518-2BF40 drop into a panel specified for 3RT2526-1BF40 without rewiring?","answer":"No — the 3RT2526-1BF40 is a larger frame size (S0 vs S00). The 3RT2518-2BF40 is 45 mm wide; the S0 frame is wider. Terminal spacing and DIN rail footprint differ. You'd need to re-terminate and possibly adjust the panel layout."},{"question":"What is the depth of 3RT2518-2BF40?","answer":"The depth is 73 mm. Combined with a 45 mm width and 70 mm height, it fits the standard S00 contactor envelope."},{"question":"What wire sizes does the spring terminal accept?","answer":"The spring-type terminals accept 2x (0.5 to 4 mm²) solid or stranded conductors. That covers most control-circuit and small motor-load wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2518-2BF40","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/3RT2518-2BF40 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}}