{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2645-1AB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2645-1AB05","canonicalUrl":"https://aoctrl.com/siemens/3RT2645-1AB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS capacitor contactor, Size S3, 3RT2645-1AB05, 24 V AC coil, screw-type terminals, 6 A at 230 V AC, 3 A at 400 V AC, 80 x 140 x 152 mm, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"The Siemens 3RT2645-1AB05 is a SIRIUS capacitor contactor — Size S3 — purpose-built for switching capacitor banks in power factor correction (PFC) duty. Unlike a standard motor contactor, it handles the inrush surge a discharged capacitor presents when it hits the line. Rated 6 A at 230 V AC and 3 A at 400 V AC, this contactor is sized for the capacitor currents you'll see on a 50 Hz line. At 690 V AC the rating drops to 0 A — it's not intended for 690 V capacitor switching. The DC switching ratings (6 A at 24 V, 2 A at 60 V, 1 A at 110 V, 0.9 A at 125 V, 0.3 A at 220 V) cover control-circuit or small resistive DC loads, not the capacitor bank itself. The arcing time runs 10 to 20 ms, and the switching rate tops out at 200 operations per hour at 230 V — that's fine for daily PFC cycling but not for a rapid-pulse application. The power terminals accept solid wire up to 2x 4 mm² or stranded up to 2x 70 mm² (1x 70 mm²). At 40 °C ambient you can land a single 50 mm²; at 60 °C derate to 2x 35 mm². The auxiliary contact block (attachable, one slot) uses smaller terminals: 2x 0.5 to 1.5 mm² solid, 2x 0.75 to 2.5 mm² stranded. That covers most control-circuit wiring without needing a reducer.","metaTitle":"Siemens 3RT2645-1AB05 SIRIUS Capacitor Contactor, 6A at 230V","metaDescription":"Siemens 3RT2645-1AB05 SIRIUS capacitor contactor, Size S3, 24V AC coil. Rated 6A at 230V AC, 3A at 400V AC. Screw & snap-on DIN rail mount. Active lifecycle. Available 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":"24 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":"https://cdn.aoctrl.com/d53b58d4dbb2c343849ef587aa9ffb7d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=915504&mlfb=3RT2645-1AB05","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AB05/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2645-1AB05 and how do I get a price?","answer":"We source this part to order against an RFQ. Submit a request for quote and we'll confirm current availability and pricing at that time."},{"question":"What are the key switching ratings for 3RT2645-1AB05?","answer":"It's rated 6 A at 230 V AC and 3 A at 400 V AC for capacitor duty. DC ratings include 6 A at 24 V, 2 A at 60 V, and 1 A at 110 V. The maximum switching rate is 200 operations per hour at 230 V."},{"question":"What is the mounting method for 3RT2645-1AB05?","answer":"It mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt forward/backward."},{"question":"What compliance documentation does this brand provide for 3RT2645-1AB05?","answer":"As a Siemens SIRIUS product, standard documentation includes the declaration of conformity per IEC/EN 60947, CE marking, and RoHS/REACH compliance declarations. Specific certificates are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2645-1AB05","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/3RT2645-1AB05 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}}