{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-2XF42-0LA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-2XF42-0LA2","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-2XF42-0LA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2XF42-0LA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, 3RT2018-2XF42-0LA2, Size S00, 72-125 V DC coil, spring-type terminals, 45 mm width.","salesMarkdown":"The 3RT2018-2XF42-0LA2: The 72-125 V DC coil range covers common DC control voltages in European and Asian panels — a 110 V DC bus or a 125 V battery-backed supply both land inside the band. The inrush current peak is 1.1 A, so the control transformer or DC supply must handle that surge without dropping below the dropout threshold. The spring-type terminals on the coil accept 2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²), or 2x 4 mm² solid — no ferrules required, which shaves a few seconds per termination during panel wiring. The Size S00 frame keeps the contactor compact at 45 mm wide, 70 mm tall, and 73 mm deep — it fits standard 45 mm-wide DIN-rail slots, leaving room for an overload relay or auxiliary contact block on the same rail. ## Integration notes The arcing time is 10-15 ms, and the DC coil dropout time is 25-45 ms, which matters for coordination with upstream short-circuit protection devices.","metaTitle":"Siemens SIRIUS 3RT2018-2XF42-0LA2 Power Contactor, 72-125 V","metaDescription":"Siemens SIRIUS 3RT2018-2XF42-0LA2 power contactor, Size S00, 72-125 V DC coil, spring-type terminals, 45 mm wide, current lifecycle. Sourced to order against RFQ.","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 DC":"25 ... 45 ms","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","Rated Value":"72 ... 125 V","Initial Value":"0.7","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-type terminals","Type Of Voltage":"DC","at AC-4 maximum":"250 1/h","lifecycle_stage":"current","Auxiliary Switch":"Yes","During Operation":"-40 ... +70 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","Full-Scale Value":"1.25","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, standing, on horizontal mounting surface","Size Of Contactor":"S00","Solid Or Stranded":"2x (0,5 ... 4 mm²)","Product Brand Name":"SIRIUS","Inrush Current Peak":"1.1 A","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","Design Of The Product":"With extended operating range","Instantaneous Contact":"1","Side-By-Side Mounting":"Yes","For Auxiliary Contacts":"20 ... 12","For Main Current Circuit":"spring-loaded 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","at AC-2 at AC-3e maximum":"750 1/h","Locked-Rotor Current Peak":"0.04 A","Relative Humidity Minimum":"10 %","Holding Current Mean Value":"7 mA","at maximum Ith rated value":"4 mm²","Of Main Circuit Rated Value":"6 kV","at AC-3 rated value maximum":"690 V","at maximum AC-1 rated value":"4 mm²","at AC in hot operating state":"6.6 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","Substance Prohibitance (Date)":"10/01/2009","Design Of The Surge Suppressor":"with varistor","Duration Of Inrush Current Peak":"50 µs","Locked-Rotor Current Mean Value":"0.04 A","Duration Of Locked-Rotor Current":"250 ms","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"spring-loaded terminals","Function Module For Communication":"No","Product Function Bus Communication":"No","With Type Of Assignment 2 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 20 A","Without Load Current Share Typical":"0.8 W","closing power of magnet coil at DC":"4.5 W","holding power of magnet coil at DC":"0.75 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG NH 3NA, DIAZED 5SB, NEOZED 5SE: 35 A","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 W","for AWG cables for auxiliary contacts":"2x (20 ... 12)","number of NC contacts for main contacts":"0","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 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"No","mirror contact according to IEC 60947-4-1":"Yes","with low demand rate according to SN 31920":"40 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","with high demand rate according to SN 31920":"73 %","number of NC contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","up to 40 °C according to IEC 60077 rated value":"22 A","up to 70 °C according to IEC 60077 rated value":"18 A","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)","Of The Contactor With Added Electronically Optimized Auxiliary Switch Block Typical":"5 000 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ce2ed63d55a121ca8d1bcefd0bd1d656.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=765445&mlfb=3RT2018-2XF42-0LA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2XF42-0LA2/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage and type?","answer":"The coil is rated 72-125 V DC, with a peak inrush of 1.1 A."},{"question":"What type of terminals does the coil use?","answer":"Spring-type terminals, accepting 2x (0.5 … 1.5 mm²), 2x (0.75 … 2.5 mm²), or 2x 4 mm² solid wire."},{"question":"What clearance is needed around the contactor?","answer":"10 mm upwards, downwards, and forwards; 6 mm at the sides."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-2XF42-0LA2","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/3RT2018-2XF42-0LA2 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}}