{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-1FB42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-1FB42","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-1FB42","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-1FB42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2018-1FB42 power contactor, size S00, 24 VDC coil, screw-type terminals, 45 mm width, 73 mm depth, snap-on DIN rail mounting.","salesMarkdown":"## SIRIUS Size S00 — what the frame rating means for panel fit The 3RT2018-1FB42 is a SIRIUS-branded power contactor in the Size S00 frame — the smallest in the SIRIUS contactor family, designed for motor loads up to around 7.5 kW at 400 V AC-3, though the exact rating depends on the specific coil and auxiliary configuration. Size S00 means the contactor occupies a 45 mm wide DIN-rail footprint, 58 mm tall, and 73 mm deep — a compact envelope that fits densely packed control panels where every millimeter of rail space is allocated. Mounting is via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, with the contactor body rotatable ±180° on a vertical surface and tiltable ±22.5° forward/backward — useful when the panel layout forces an unconventional orientation. ## Coil and auxiliary contact ratings — what switches at what voltage The magnet coil is rated 24 V DC with screw-type terminals, and the operating range spans 0.8× to 1.1× of the rated value — so the coil pulls in reliably between about 19.2 V and 26.4 V DC. An auxiliary switch is built in, rated for 10 A at 24 V DC, 2 A at 48 V and 60 V DC, 1 A at 110 V DC, 0.9 A at 125 V DC, and 0.3 A at 220 V DC — the current drops sharply as voltage rises due to DC arc extinction limits. At 400 V AC the auxiliary contacts are rated 3 A, and at 230 V AC the contactor is listed for 2 hp motor load — a direct cross-check for North American motor branch circuits. ## Switching frequency and thermal limits — duty-cycle planning Maximum switching rates are duty-dependent: 1,000 operations per hour in AC-1 (resistive), 750/h in AC-2 and AC-3 (motor starting/running), and 250/h in AC-4 (plugging/inching) — the AC-4 ceiling is the binding constraint for high-duty-cycle applications like crane controls. The contactor is rated for 30 million mechanical operations typical — a high endurance figure that suits applications with frequent cycling, such as conveyor indexing or HVAC staging. Operating temperature range is -25 °C to +60 °C, with storage from -55 °C to +80 °C — the -25 °C lower limit means the contactor is not rated for deep-freeze or unheated outdoor enclosures in cold climates without supplemental heating. ## Wiring and clearance — what the terminal specs demand Screw terminals accept solid or stranded conductors from 0.5 mm² to 4 mm², with dual-wire capability: 2 × (0.5...1.5 mm²), 2 × (0.75...2.5 mm²), or 2 × 4 mm² — useful for daisy-chaining control wiring without separate terminal blocks. Minimum clearance distances around the contactor are 10 mm upward, 10 mm forward, 10 mm downward, and 6 mm at the sides — these are the free-air gaps needed for heat dissipation and arc quenching; crowding the contactor below these clearances derates the thermal capacity. Arcing time is 10 to 15 ms, and the DC operating time (coil pickup to main contact closure) is 38 to 65 ms — the spread matters for sequencing interlocks where contactors must close in a defined order. ## Lifecycle and sourcing — current production, quoted to order Sourced through independent distribution channels; availability and current pricing are confirmed at RFQ against the BOM quantity.","metaTitle":"Siemens 3RT2018-1FB42 SIRIUS Contactor, Size S00","metaDescription":"Siemens 3RT2018-1FB42 SIRIUS power contactor, size S00, 24 VDC coil, screw terminals. Current production. Quoted to order. 45 mm wide, 73 mm deep.","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":"38 ... 65 ms","title":"3RT2018-1FB42","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 diode, auxiliary contacts: 1 NC, 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","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"3 W","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":"diode","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 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 NC 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":"$45.72","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/772572cbbf0da5fb64b8fa098f7a9649.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=55737&mlfb=3RT2018-1FB42"},"ai":{"faq":[{"question":"What is the 3RT2018-1FB42 depth and width for panel layout?","answer":"The contactor is 73 mm deep, 45 mm wide, and 58 mm tall — the Size S00 frame fits standard 35 mm DIN rail with snap-on mounting."},{"question":"What wire sizes does the 3RT2018-1FB42 accept?","answer":"Screw terminals accept solid or stranded wire from 0.5 mm² to 4 mm², and dual-wire terminations up to 2 × 4 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-1FB42","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/3RT2018-1FB42 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}