{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2645-1AF05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2645-1AF05","canonicalUrl":"https://aoctrl.com/siemens/3RT2645-1AF05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AF05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS capacitor contactor, Size S3, 3RT2645-1AF05, rated 400 V 3 A, screw and snap-on mounting on 35 mm DIN rail, current lifecycle.","salesMarkdown":"## SIRIUS 3RT2645-1AF05 capacitor contactor — 400 V 3 A, Size S3 The Siemens 3RT2645-1AF05 is a SIRIUS capacitor contactor, Size S3, designed for switching capacitor banks in power-factor correction panels. Its 400 V 3 A rating covers the typical load profile of a capacitor bank at that voltage — the inrush current from charging capacitors is what this contactor is built to handle, not a resistive or motor load. The coil is AC-operated with screw-type terminals. The 80 mm width and 140 mm height with 152 mm depth fit a standard S3 contactor footprint — panel cutouts and gland plates sized for S3 will accept this unit without rework. Power terminals accept solid conductors: 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or 2x 4 mm². For stranded wire, the range goes up to 2x (10…70 mm²) or 1x (10…70 mm²). The auxiliary contact block is attachable — one slot available for adding a mirror contact or signalling contact. Coil terminals are screw-type. ## Switching ratings and operating limits Rated for AC switching at 50 Hz. The contactor breaks 6 A at 24 V, 6 A at 230 V, 3 A at 400 V, and 0 A at 690 V — the 690 V entry confirms this contactor is not intended for 690 V capacitor switching. Mechanical operating frequency tops out at 200 cycles per hour at 230/240 V, dropping to 40 cycles per hour at 600/690 V. Arcing time is 10…20 ms, with a spread of 10…21 ms at AC. Ambient operating range is -25…+60 °C; storage range -55…+80 °C.","metaTitle":"Siemens 3RT2645-1AF05 SIRIUS Capacitor Contactor, 400 V 3 A","metaDescription":"Siemens SIRIUS 3RT2645-1AF05 capacitor contactor, Size S3, rated 400 V 3 A for AC switching. Screw/snap-on 35 mm DIN rail. Current lifecycle. Sourced to order.","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":"0","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":"2","number of NO contacts for auxiliary contacts":"0","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=915506&mlfb=3RT2645-1AF05","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AF05/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT2645-1AF05's listed depth?","answer":"The depth is 152 mm. Combined with 80 mm width and 140 mm height, it occupies a standard S3 contactor footprint."},{"question":"What solid conductor sizes does 3RT2645-1AF05 accept?","answer":"Solid conductors accepted: 2x (0.5…1.5 mm²), 2x (0.75…2.5 mm²), or 2x 4 mm². Stranded wire up to 2x (10…70 mm²) or 1x (10…70 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2645-1AF05","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/3RT2645-1AF05 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}}