{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2018-2AN21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2018-2AN21","canonicalUrl":"https://aoctrl.com/siemens/3RT2018-2AN21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2AN21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS power contactor, Size S00, 24 VDC coil, spring-type terminals, 3RT2018-2AN21.","salesMarkdown":"The 24 VDC coil pulls in at nominal voltage and holds reliably across the -25 to +60 °C operating range. Coil terminals are spring-type (push-in), which speeds wiring compared to screw terminals — strip 8 mm, push, done. Size S00 means the contactor body is 70 mm tall, 45 mm wide, and 73 mm deep — compact enough to pack several units side-by-side on a DIN rail. The 45 mm width is a single modular unit (1 MW = 18 mm), so it occupies 2.5 MW of rail space. That matters when you're laying out a dense panel and every millimeter of DIN rail is spoken for. Switching frequency varies by duty class: up to 1,000 cycles/hour for AC-1 resistive loads, 750 cycles/hour for AC-2 and AC-3 motor loads, and 250 cycles/hour for AC-4 (plugging/inching). If your application cycles a motor on/off every few seconds, the AC-3 ceiling of 750 ops/hour (one cycle every 4.8 seconds) is the hard limit — exceed it and the contactor overheats. The auxiliary switch is built in (1 NO + 1 NC, 20...12 on the main contact scale), which saves buying a separate side-mount block for basic feedback. For higher auxiliary contact counts, you add a SIRIUS auxiliary switch block that clips onto the front. That means it fits in panels where the DIN rail is mounted sideways or at an angle — common in tight retrofit enclosures. Wire range: solid or stranded 0.5...4 mm², with two conductors per terminal possible (2x 0.5...4 mm²). The spring terminals accept ferruled stranded wire cleanly. That 6 mm side gap is tight — if you're mounting contactors side-by-side, they can touch; the gap is for air circulation, not electrical clearance.","metaTitle":"Siemens 3RT2018-2AN21 SIRIUS Power Contactor, Size S00, 24 V","metaDescription":"Siemens 3RT2018-2AN21 SIRIUS power contactor, Size S00, 24 VDC coil, spring-type terminals. Rated 10 A at 24 V. DIN rail mount. Current production. Available to order.","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 AC":"4 ... 15 ms","Height":"70 mm","Upwards":"10 mm","Forwards":"10 mm","Stranded":"0.5 ... 4 mm²","at 50 Hz":"0.25","at 60 Hz":"0.25","Downwards":"10 mm","Arcing Time":"10 ... 15 ms","At The Side":"6 mm","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Spring-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","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 ... 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 50 Hz rated value":"220 V","at 500 V rated value":"2 A","at 60 Hz rated value":"220 V","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":"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","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-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","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":"spring-loaded 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":"5.7 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)","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 ... 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 ... 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 %","Finely Stranded Without Core End Processing":"2x (0.5 ... 2.5 mm²)","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/8a0a5aee58c4a56b704fb12193170f44.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=165626&mlfb=3RT2018-2AN21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2018-2AN21/alternatives.json"},"ai":{"faq":[{"question":"What is the depth of 3RT2018-2AN21?","answer":"The depth is 73 mm. Overall dimensions are 70 mm height, 45 mm width, and 73 mm depth."},{"question":"What wire sizes does the spring terminal accept?","answer":"Solid or stranded wire from 0.5 to 4 mm², and two conductors of the same range per terminal (2x 0.5...4 mm²)."},{"question":"Where can I buy 3RT2018-2AN21?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RT2018-2AN21 fit in a panel designed for 3RT2015-2AP01?","answer":"Both are Size S00 contactors with the same 45 mm width and DIN rail mounting, so the footprint is identical. The main difference is the coil voltage — 3RT2018-2AN21 uses 24 VDC, while 3RT2015-2AP01 uses a different coil. Check the coil voltage matches your control circuit before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2018-2AN21","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/3RT2018-2AN21 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}}