{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2645-1AP03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2645-1AP03","canonicalUrl":"https://aoctrl.com/siemens/3RT2645-1AP03","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AP03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2645-1AP03 capacitor contactor, size S3, 230 V 50 Hz rated voltage, screw and snap-on 35 mm DIN rail mounting.","salesMarkdown":"The Siemens SIRIUS 3RT2645-1AP03 is a capacitor contactor in the size S3 frame, designed specifically for switching capacitor banks in power factor correction (PFC) applications. It is rated for 230 V at 50 Hz, the standard line voltage and frequency for many European and Asian industrial panels. Unlike a standard motor contactor, a capacitor contactor must handle the high inrush current and transient stress when a discharged capacitor bank is switched onto the line. The 3RT2645-1AP03 is built for that duty cycle, with an arcing time of 10 to 20 ms and a switching frequency of up to 200 operations per hour at 230 V to 240 V, tapering to 40 operations per hour at 690 V. Dimensions are 80 mm wide, 140 mm high, and 152 mm deep — the depth is the dimension that projects from the DIN rail, so verify clearance to the enclosure door or rear panel. The magnet coil termination uses screw-type terminals. Power-side conductor cross-sections are rated for solid: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), 2x 4 mm²; and stranded: 2x (10 to 70 mm²), 1x (10 to 70 mm²). At 40 °C ambient, a single 50 mm² conductor is permitted; at 60 °C, two 35 mm² conductors. ## Switching ratings and thermal limits Switching current is rated per voltage: 6 A at 24 V AC, 6 A at 230 V AC, 3 A at 400 V AC, and 0 A at 690 V AC. The contactor also carries a 1 A rating at 110 V AC and 0.9 A at 125 V AC. The instantaneous contact is rated for 1 make operation, consistent with capacitor switching where the contact closes once per switching cycle. The operating frequency at 230 V maximum is 200 operations per hour, which is adequate for automatic PFC controllers switching at intervals of several minutes. For BOM freeze or new design-ins, this part is a standard catalog item from the SIRIUS family.","metaTitle":"Siemens SIRIUS 3RT2645-1AP03 Capacitor Contactor, Size S3, 2","metaDescription":"Siemens SIRIUS 3RT2645-1AP03 capacitor contactor, size S3, rated 230 V at 50 Hz. Screw and snap-on 35 mm DIN rail mounting. Current lifecycle stage. 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":"230 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=915507&mlfb=3RT2645-1AP03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2645-1AP03/alternatives.json"},"ai":{"faq":[{"question":"What are the key physical dimensions for panel layout?","answer":"Width is 80 mm, height is 140 mm, and depth is 152 mm. The depth is the projection from the DIN rail, so ensure at least 155 mm clearance from the rail to the enclosure door or rear wall."},{"question":"What conductor sizes does the 3RT2645-1AP03 accept?","answer":"Solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), 2x 4 mm². Stranded conductors: 2x (10 to 70 mm²), 1x (10 to 70 mm²). At 40 °C ambient, a single 50 mm² conductor is permitted; at 60 °C, two 35 mm² conductors."},{"question":"What is the maximum switching frequency at 400 V?","answer":"At 400 V maximum, the switching frequency is 100 operations per hour. This decreases to 60 operations per hour at 480 V and 500 V, and 40 operations per hour at 600 V and 690 V."},{"question":"What is the operating temperature range?","answer":"During operation, the range is -25 to +60 °C. During storage, the range is -55 to +80 °C."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2645-1AP03","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/3RT2645-1AP03 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}}