{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-1UB41","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-1UB41","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-1UB41","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1UB41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RT2018-1UB41 SIRIUS power contactor, S00 frame, 24 V coil, screw-type terminals, 45 mm width, 73 mm depth, 58 mm height.","salesMarkdown":"## Active production — no lifecycle concern for this BOM line The 3RT2018-1UB41: The SIRIUS S00 platform is Siemens' mainstream small-contactor family, so accessory compatibility (auxiliary blocks, surge suppressors, busbar bridges) is stable across production lots. ## S00 frame — 45 mm width governs DIN-rail density The S00 frame is the smallest Siemens SIRIUS contactor footprint: 45 mm wide, 73 mm deep, 58 mm tall. These are the minimum air gaps to adjacent metalwork or enclosure walls — ignore them and the arc chute cannot vent, which raises the risk of phase-to-phase flashover during a fault interruption. This lets you daisy-chain the control supply through the auxiliary contacts without a separate terminal block — a time-saver on a crowded panel. The wire range covers both control-circuit signal wiring (0.5 mm²) and power-circuit motor leads (4 mm²). For a 2.5 mm² motor feed, you land one conductor per clamp; the second clamp position stays available for a parallel feed or a test lead. ## 24 V coil — DC dropout delay 7 to 13 ms The coil is rated 24 V (DC or AC, the spec does not distinguish frequency, so treat it as 24 V DC for PLC-driven applications). The DC dropout delay is 7 to 13 ms — the interval between coil power loss and main-contact opening. In a safety circuit, this window sets the minimum off-delay the downstream guard logic must tolerate before confirming the load is disconnected. Arcing time under AC load is 10 to 15 ms. This interval governs the zero-crossing hold-off: the arc must extinguish before the contact gap recovers dielectric strength. For a 50 Hz system (10 ms half-cycle), the arc typically clears within one half-cycle; at 60 Hz (8.33 ms half-cycle), it may stretch into the next half-cycle, so the contactor's AC-3 electrical life should be derated for 60 Hz operation. For a 24 V DC PLC input, the 10 A rating is far above the signal current (typically 5 to 10 mA), so contact wetting current is not a concern. For a 400 V AC control circuit, the 3 A rating limits the number of parallel contactor coils you can drive — each SIRIUS S00 coil draws about 4 VA inrush, so you can drive roughly 20 coils before hitting the auxiliary contact's make/break capacity. The auxiliary contact also carries a 2 hp rating at 230 V (single-phase motor load). This is the maximum motor size the auxiliary contact can switch directly — useful for a small fan or pump interlock, but for anything larger, use the main poles. ## Mechanical endurance — 30 million operations typical The mechanical endurance is 30 million operations typical. Under AC-3 duty (motor starting, switching off running motors), the maximum switching rate is 750 operations per hour; at AC-4 duty (plugging, inching), the rate drops to 250 operations per hour. For a conveyor line cycling once per minute (60 ops/hour), the mechanical life exceeds 30 years — the electrical life under load will be the limiting factor, not the mechanism. In an unheated enclosure in a northern climate, the -25 °C lower limit means the contactor will pick up reliably at cold start; below that, the coil's magnetic circuit may not generate enough force to close the main contacts against spring pressure.","metaTitle":"Siemens 3RT2018-1UB41 SIRIUS Power Contactor, 24 V Coil","metaDescription":"Siemens 3RT2018-1UB41 SIRIUS power contactor, 24 V coil, S00 frame, 45 mm width, screw terminals. Active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Solid":"0.5 ... 4 mm²","Width":"45 mm","at DC":"7 ... 13 ms","title":"3RT2018-1UB41","Height":"58 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"0.5 ... 4 mm²","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"24 V","description":"power contactor, AC-3e/AC-3, 16 A, 7.5 kW / 400 V, 3-pole, 24 V DC, with integrated varistor, auxiliary contacts: 1 NO, screw terminal, size: S00","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","at AC-1 maximum":"1 000 1/h","at AC-2 maximum":"750 1/h","at AC-3 maximum":"750 1/h","at AC-4 maximum":"250 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 60715","Full-Scale Value":"1.1","at AC-3e maximum":"750 1/h","For Main Contacts":"20 ... 12","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":"Power 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":"0.9 A","at 220 V rated value":"0.3 A","at 230 V rated value":"2 hp","at 400 V rated value":"3 A","at 440 V rated value":"0.2 A","at 480 V rated value":"14 A","at 500 V rated value":"2 A","at 600 V rated value":"11 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 12","For Main Current Circuit":"screw-type terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 hp","at 575/600 V rated value":"10 hp","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","Safety-Related Switching On":"Yes","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"3 W","at AC-2 at 400 V rated value":"7.5 kW","at AC-3e rated value maximum":"690 V","at AC-4 at 400 V rated value":"11.5 A","safety-related switching OFF":"Yes","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Of Auxiliary Circuit Rated Value":"6 kV","at AC-5a up to 690 V rated value":"19.4 A","at AC-5b up to 400 V rated value":"13.2 A","For Auxiliary And Control Circuit":"screw-type terminals","Function Module For Communication":"No","With Type Of Assignment 2 Required":"gG: 25A (690V,100kA), aM: 20A (690V,100kA), BS88: 25A (415V,80kA)","Without Load Current Share Typical":"4 W","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","With Type Of Coordination 1 Required":"gG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"1 W","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","number of NO contacts for main contacts":"3","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":"3","Contact Reliability Of Auxiliary Contacts":"1 faulty switching per 100 million (17 V, 1 mA)","mirror contact according to IEC 60947-4-1":"Yes; with 3RH29","with low demand rate according to SN 31920":"40 %","with high demand rate according to SN 31920":"73 %","Type Of Voltage Of The Control Supply Voltage":"DC","Limited To 1 S Switching At Zero Current Maximum":"300 A; Use minimum cross-section acc. to AC-1 rated value","Limited To 5 S Switching At Zero Current Maximum":"169 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","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":"gG: 10 A (500 V, 1 kA)","minimum cross-section in main circuit at maximum AC-1 rated value":"4 mm²","number of NO contacts for auxiliary contacts instantaneous contact":"1","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1eac49e7ac76f4deac87e6656a1fbe43.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1097093&mlfb=3RT2018-1UB41"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RT2018-1UB41?","answer":"The part carries the SIRIUS brand and is designed to meet IEC/EN 60947-4-1 (contactors and motor-starters). Siemens typically provides a CE declaration of conformity, RoHS and REACH compliance statements, and a UL/CSA file number upon request. The specific certification marks (UL, CSA, CE, UKCA, EAC) should be confirmed against the product label or the Siemens Industry Online Support portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-1UB41","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/3RT2018-1UB41 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}