{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-4AK61","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-4AK61","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-4AK61","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-4AK61","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2018-4AK61 power contactor, Size S00, 110 VAC 50 Hz / 120 VAC 60 Hz coil, screw and snap-on 35 mm DIN rail mounting, 73 mm depth, 45 mm width.","salesMarkdown":"## SIRIUS Size S00 power contactor The 3RT2018-4AK61: This is a standard industrial control voltage in many regions; the dual-frequency rating means the same coil works on 50 Hz or 60 Hz supply without a change. Physical dimensions are 73 mm deep, 45 mm wide, and 58 mm tall. These clearances are for heat dissipation and arc flash containment — respect them in the panel layout to avoid derating or arc-over between adjacent devices. Maximum switching rates: 1,000 operations per hour for AC-1 (resistive) loads, 750 ops/h for AC-2 and AC-3 (motor) duty, and 250 ops/h for AC-4 (plugging/inching) duty. The AC-3e rating also caps at 750 ops/h. These limits are set by thermal rise in the contact tips during arcing — exceeding them shortens contact life or causes welding. This is the contactor mechanism endurance without electrical load; actual electrical life depends on the switched current and load type, and will be lower under heavy AC-4 duty. ## Auxiliary contact ratings and arcing The contactor includes an auxiliary switch block. These are the make/break capacities for the auxiliary circuit — use them to size the control transformer and fuse protection for the PLC or relay inputs. Arcing time is 4 to 15 ms at AC, with a typical range of 10 to 15 ms. This is the duration the arc sustains between opening contacts — relevant for coordination with upstream protection devices and for estimating contact erosion per switching cycle. ## Temperature range and storage Storage temperature range is -55 °C to +80 °C. The wide storage range allows the contactor to sit in a spare-parts bin in unconditioned warehouses; the operating range covers most industrial environments but note that the coil pull-in voltage and contact ratings may need derating at the temperature extremes.","metaTitle":"Siemens 3RT2018-4AK61 SIRIUS Contactor, 110 VAC Coil","metaDescription":"Siemens 3RT2018-4AK61 SIRIUS power contactor, Size S00, 110 V 50 Hz / 120 V 60 Hz coil, screw and snap-on DIN rail mount. Active production, sourced per RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"73 mm","Width":"45 mm","at AC":"4 ... 15 ms","Height":"58 mm","Upwards":"10 mm","Forwards":"10 mm","at 50 Hz":"0.24","at 60 Hz":"0.24","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Ring cable lug connection","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","at AC-3e maximum":"750 1/h","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","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 50 Hz rated value":"110 V","at 500 V rated value":"2 A","at 60 Hz rated value":"120 V","at 600 V rated value":"11 A","at 690 V rated value":"1 A","Side-By-Side Mounting":"Yes","For Main Current Circuit":"Ring cable lug connection","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","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":"ring terminal lug connection","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":"5.9 W","At Contactor For Auxiliary Contacts":"Ring cable lug connection","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","number of NO contacts for main contacts":"3","reference code according to IEC 81346-2":"Q","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":"AC","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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f94b0da1817b2b0e3cff8dd85409495f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=506574&mlfb=3RT2018-4AK61","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-4AK61/alternatives.json"},"ai":{"faq":[{"question":"What coil voltage does 3RT2018-4AK61 use?","answer":"The coil connection uses a ring cable lug terminal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-4AK61","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/3RT2018-4AK61 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}}