{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-2LB42-2LA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-2LB42-2LA0","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-2LB42-2LA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2LB42-2LA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2018-2LB42-2LA0, size S00 contactor, 24 VDC coil with spring-type terminals, 45 mm wide, 70 mm high, 121 mm deep.","salesMarkdown":"## Siemens SIRIUS 3RT2018-2LB42-2LA0 — S00 Contactor, 24 VDC Coil, Spring-Terminal It carries a 24 VDC magnet coil terminated via spring-type terminals — no screw torque to verify, which saves time on the panel build and eliminates a common field failure point (loose screw connections under vibration). Main contacts are rated for 20 A down to 12 A (the range covers the standard AC-3 motor duty and AC-1 resistive load curves for this frame). The auxiliary switch is integrated, with switching capacity documented per the DC voltage rail: 10 A at 24 V, 2 A at 48 V and 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V, 3 A at 400 V, 14 A at 480 V, 2 A at 500 V, 11 A at 600 V, and 1 A at 690 V — these are the values to use when sizing the control circuit, not the main power path. The S00 footprint is 45 mm wide by 70 mm high by 121 mm deep — a standard slot that fits alongside other SIRIUS S00 components on the same rail without stealing extra width. Conductor terminations on the spring-type terminals accept solid or stranded wire: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), 2x 4 mm², or 2x (0.5 to 4 mm²). Strip length per the terminal manufacturer's recommendation — the spring cage holds firmly when the conductor is fully inserted. ## Environmental and Timing The coil pick-up and drop-out times at DC are 7 to 20 ms, and the arcing time on the main contacts is 10 to 15 ms. The maximum switching rate under AC-4 duty (plugging / inching) is 250 operations per hour. For continuous motor starting (AC-3), the rate is higher — consult the thermal derating for your specific load current.","metaTitle":"Siemens 3RT2018-2LB42-2LA0 SIRIUS Contactor, S00, 24 VDC Coi","metaDescription":"Siemens SIRIUS 3RT2018-2LB42-2LA0 contactor, size S00, 24 VDC coil with spring-type terminals. Rated for 20-12 A main contacts. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"121 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","at DC":"7 ... 20 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":"24 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 standard mounting rail according to DIN EN 60715","Full-Scale Value":"1.25","For Main Contacts":"20 ... 12","Mounting Position":"hanging, on horizontal 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":"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 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","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","Relative Humidity Minimum":"10 %","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","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","Product Function Bus 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":"13 W","holding power of magnet coil at DC":"4 W","At Contactor For Auxiliary Contacts":"Spring-type terminals","With Type Of Coordination 1 Required":"gG: 50A (690V,100kA), aM: 25A (690V,100kA), BS88: 50A (415V,80kA)","at AWG cables for auxiliary contacts":"2x (20 ... 12)","operational current at AC-12 maximum":"10 A","at AC in hot operating state per pole":"2.2 W","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","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/9eb00458479d81c5099b1efb7c2ec94f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=246000&mlfb=3RT2018-2LB42-2LA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2LB42-2LA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key dimensions of this contactor?","answer":"Width is 45 mm, height is 70 mm, and depth is 121 mm. It mounts on 35 mm DIN rail per DIN EN 60715, with clearance requirements of 10 mm upwards, forwards, and downwards, and 6 mm at the side."},{"question":"What wire sizes does the spring terminal accept?","answer":"The spring-type terminals accept solid or stranded wire in these combinations: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), 2x 4 mm², or 2x (0.5 to 4 mm²)."},{"question":"Where can I buy 3RT2018-2LB42-2LA0 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm quote."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-2LB42-2LA0","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/3RT2018-2LB42-2LA0 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}}