{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2646-1AB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2646-1AB05","canonicalUrl":"https://aoctrl.com/siemens/3RT2646-1AB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2646-1AB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2646-1AB05 capacitor contactor, 24 VAC coil, S3 size, screw and snap-on 35 mm DIN rail mounting, 80 x 140 x 152 mm.","salesMarkdown":"## Capacitor Switching Contactor for Power Factor Correction The Siemens 3RT2646-1AB05 is a SIRIUS capacitor contactor, size S3, designed specifically for switching capacitor banks in power factor correction (PFC) applications. It handles the high inrush currents and transient loads that standard contactors aren't rated for, making it the right call for any panel where you're switching PFC stages on a 50 Hz network. Rated for AC coil voltage of 24 V at 50 Hz, this contactor switches capacitor loads up to 6 A at 230 V and 3 A at 400 V, with a maximum operating frequency of 150 switching operations per hour at 230 V to 240 V. At 690 V the resistive switching capacity drops to 0 A — this is a capacitor-duty device, not a general-purpose power contactor, so don't spec it for motor loads. The contactor operates across a 0.8 to 1.1 times rated voltage range at 50 Hz, so it holds in during sags but drops out cleanly on a brownout. ## Mounting and Environmental Fit for the Panel The 80 mm width and 140 mm height fit a standard S3 contactor footprint; depth is 152 mm including the arc chamber. The S3 frame size accepts up to 70 mm² power cable on the main poles (1x 70 mm² at 40 °C, 2x 50 mm² at 60 °C), so it handles the larger conductors typical of capacitor bank wiring. ## Switching Performance and Duty Cycle Arcing time is 10 to 20 ms, with an AC switching time of 10 to 21 ms. That's fast enough to minimize contact wear during capacitor inrush, but the real limit is the maximum operating frequency: 150 cycles per hour at 230 V to 240 V, dropping to 80 at 400 V, 53 at 480 V to 500 V, 32 at 600 V, and 30 at 690 V. If your PFC controller is switching stages more frequently than that, you'll overshoot the contactor's thermal limit — step up to a larger frame or reduce the switching rate.","metaTitle":"Siemens 3RT2646-1AB05 SIRIUS Capacitor Contactor, 24 VAC, S3","metaDescription":"Siemens 3RT2646-1AB05 SIRIUS capacitor contactor, 24 VAC coil, S3 size, 80x140x152 mm. Screw and snap-on DIN rail mounting. Rated for capacitor switching up to 690 V. Available to","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 70 mm²","at 60 °C":"2x 50 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":"150 1/h","at 240 V maximum":"150 1/h","at 400 V maximum":"80 1/h","at 480 V maximum":"53 1/h","at 500 V maximum":"53 1/h","at 600 V maximum":"32 1/h","at 690 V maximum":"30 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)":"120 000","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=915513&mlfb=3RT2646-1AB05","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2646-1AB05/alternatives.json"},"ai":{"faq":[{"question":"What is the 3RT2646-1AB05 used for?","answer":"It is a capacitor contactor for switching power factor correction capacitor banks on 50 Hz AC networks, rated for the high inrush currents of capacitive loads."},{"question":"What are the key ratings of the 3RT2646-1AB05?","answer":"24 VAC 50 Hz coil, S3 frame size, 80 x 140 x 152 mm, screw and snap-on DIN rail mounting, switching capacity up to 6 A at 230 V and 3 A at 400 V, with a maximum operating frequency of 150 cycles/hour at 230 V."},{"question":"Where can I buy the 3RT2646-1AB05?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm quote on your quantity."},{"question":"Will the 3RT2646-1AB05 drop into a panel specified for the 3RT2036-1AC20-ZX95?","answer":"Both are SIRIUS capacitor contactors, but the 3RT2646-1AB05 is an S3 frame while the 3RT2036-1AC20-ZX95 is a different size class. Verify the mounting footprint and DIN rail spacing before assuming a direct drop-in; the 80 mm width matches S3, but check the peer's dimensions against your panel layout."},{"question":"What compliance documentation does Siemens provide for the 3RT2646-1AB05?","answer":"As a standard SIRIUS catalog product, it carries CE marking for the European market and is designed to meet applicable IEC and EN standards. Specific declarations (RoHS, REACH, UL) are available from Siemens upon request or through their documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2646-1AB05","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/3RT2646-1AB05 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}}