{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2645-1AF03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2645-1AF03","canonicalUrl":"https://aoctrl.com/siemens/3RT2645-1AF03","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AF03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2645-1AF03, S3 capacitor contactor, 110 V AC 50 Hz coil, screw-type terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens 3RT2645-1AF03 is a SIRIUS S3-size capacitor contactor designed for switching capacitor banks in power factor correction (PFC) applications. It switches capacitive loads without the inrush surge welding the main contacts — that's the difference from a standard motor contactor. The 110 V AC 50 Hz coil is screw-type terminated. The switching frequency is 200 operations per hour at 230/240 V, dropping to 40 per hour at 600/690 V, so it's built for periodic compensation, not continuous hunting. An auxiliary contact block can be attached (1 available slot), and the contactor includes one instantaneous contact for feedback or interlocking. Dimensions are 80 mm wide, 140 mm high, 152 mm deep — an S3 frame that fits alongside other SIRIUS gear on the same rail. Power wiring accepts stranded conductors up to 70 mm² (2x or 1x) and solid conductors from 0.5 to 4 mm². The coil terminals are screw-type, same as the main terminals — no push-in or spring-cage on the coil, so keep a screwdriver handy.","metaTitle":"Siemens 3RT2645-1AF03 SIRIUS Capacitor Contactor, 110V AC Co","metaDescription":"Siemens SIRIUS 3RT2645-1AF03 capacitor contactor, S3 size, 110V AC 50Hz coil. Rated 6A at 230V, 3A at 400V. Screw/snap-on DIN rail mount. Active production, sourced to order. RFQ f","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"152 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"80 mm","at AC":"10 ... 21 ms","Height":"140 mm","at 24 V":"6 A","at 60 V":"2 A","Stranded":"2x (10 ... 70 mm²), 1x (10 ... 70 mm²)","at 110 V":"1 A","at 125 V":"0.9 A","at 220 V":"0.3 A","at 230 V":"6 A","at 400 V":"3 A","at 50 Hz":"0.8 ... 1.1","at 690 V":"0 A","at 40 °C":"1x 50 mm²","at 60 °C":"2x 35 mm²","Attachable":"1","Arcing Time":"10 ... 20 ms","1 Rated Value":"50 Hz","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","Type Of Voltage":"AC","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","Fastening Method":"screw and snap-on mounting onto 35 mm DIN rail according to DIN EN 50022","at 230 V maximum":"200 1/h","at 240 V maximum":"200 1/h","at 400 V maximum":"100 1/h","at 480 V maximum":"60 1/h","at 500 V maximum":"60 1/h","at 600 V maximum":"40 1/h","at 690 V maximum":"40 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":"S3","Solid Or Stranded":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Product Brand Name":"SIRIUS","Product Designation":"capacitor contactors","at 50 Hz rated value":"110 V","Instantaneous Contact":"1","For Main Current Circuit":"screw-type terminals","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"8 kV","Substance Prohibitance (Date)":"06/26/2017","For Grounded Parts At The Side":"10 mm","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","At Contactor For Auxiliary Contacts":"Screw-type terminals","for AWG cables for auxiliary contacts":"2x (20 ... 16), 2x (18 ... 14), 2x 12","With Side-By-Side Mounting At The Side":"10 mm","Electrical Endurance (Operating Cycles)":"200 000","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 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Number Of Poles For Main Current Circuit":"3","Contact Reliability Of Auxiliary Contacts":"0.00000001","mirror contact according to IEC 60947-4-1":"No","apparent holding power of magnet coil at AC":"19 VA","apparent pick-up power of magnet coil at AC":"296 VA","number of NC contacts for auxiliary contacts":"1","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"AC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Inductive Power Factor With Closing Power Of The Coil":"0.61","Of Main Circuit With Degree Of Pollution 3 Rated Value":"1 000 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.38","Of The Contactor With Added Auxiliary Switch Block Typical":"3 000 000","operational current of auxiliary contacts at AC-12 maximum":"10 A","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)","AWG number as coded connectable conductor cross section for main contacts":"8","For Short-Circuit Protection Of The Main Circuit With Type Of Coordination 1 Required":"gG: 250 A (690 V, 50 kA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=915505&mlfb=3RT2645-1AF03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AF03/alternatives.json"},"ai":{"faq":[{"question":"What is the coil voltage and frequency for this contactor?","answer":"The coil is rated 110 V AC at 50 Hz. The coil terminals are screw-type."},{"question":"What wire sizes does the 3RT2645-1AF03 accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Stranded conductors: 2x (10 to 70 mm²) or 1x (10 to 70 mm²)."},{"question":"Can this contactor switch 690 V capacitor banks?","answer":"No. The rated current at 690 V is 0 A. It is intended for 230 V and 400 V bank switching."},{"question":"What mounting options does this contactor support?","answer":"Screw mounting or snap-on onto 35 mm DIN rail per EN 50022. The mounting position allows +/-180° rotation and +/-22.5° tilt on a vertical surface."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2645-1AF03","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/3RT2645-1AF03 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}}