{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2628-1BB45","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2628-1BB45","canonicalUrl":"https://aoctrl.com/siemens/3RT2628-1BB45","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2628-1BB45","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS capacitor contactor, 3RT2628-1BB45, 24 VDC coil, S0 frame, screw-type terminals, 45 mm width, 150 mm height, 165 mm depth.","salesMarkdown":"## Capacitor Switching on a 24 VDC Coil — S0 Frame The Siemens 3RT2628-1BB45 is a SIRIUS capacitor contactor, purpose-built for switching capacitive loads in power factor correction banks. Its 24 VDC coil (screw-type terminals) pulls in with a 0.8 x rated voltage pickup threshold and releases with dropout below 18 V — a clean, predictable magnet curve for PLC-driven control circuits. Rated for capacitor switching at 230 V (6 A), 400 V (3 A), and 690 V (1 A), the contactor's S0 frame (45 x 150 x 165 mm) fits standard 35 mm DIN rail per EN 50022, with screw and snap-on fastening. Switching frequency tops out at 100 operations per hour at 230/240/400 V, dropping to 36 ops/h at 690 V — the arc time of 10 ms and DC switching time of 15–18 ms define the thermal recovery window. For repetitive capacitor bank cycling, stay under these limits to avoid contact welding. The 24 VDC coil is the control side — it draws from a 24 VDC power supply, not an AC control transformer. The 0.8 x rated pickup means the coil will reliably pull in at 19.2 V, giving margin against a sagging bus. The 1.1 x full-scale value is the maximum continuous overvoltage the coil can tolerate without damage — important if your 24 VDC bus runs high. Capacitor switching currents are given per voltage: 6 A at 230 V, 3 A at 400 V, 1 A at 690 V (–). These are not the same as a general-purpose contactor's AC-1 or AC-3 ratings — capacitor contactors must handle inrush currents up to 100× the rated capacitor current without welding. The S0 frame's contact geometry is designed for that high-peak stress. Wire termination: solid conductors accept 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or 2x 4 mm². Stranded conductors accept 2x (1–2.5 mm²) or 2x (2.5–10 mm²). The screw terminals are rated for 1x 16 mm² at 40 °C and 1x 25 mm² at 60 °C — the higher temperature rating reflects the lower current density at the terminal for larger wire. ## Panel Integration and Environmental Limits The S0 frame occupies 45 mm of rail width — standard for a contactor of this class. No auxiliary contact block is attached from the factory (— 0 attachable). If you need auxiliary contacts for status feedback or interlocking, the contactor accepts SIRIUS side-mount or top-mount auxiliary blocks — order them separately.","metaTitle":"Siemens 3RT2628-1BB45 SIRIUS Capacitor Contactor, 24 VDC Coi","metaDescription":"Siemens 3RT2628-1BB45 SIRIUS capacitor contactor, 24 VDC coil, S0 frame, screw terminals, 45 mm wide. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"165 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","at DC":"15 ... 18 ms","title":"3RT2628-1BB45","Height":"150 mm","at 24 V":"6 A","at 60 V":"2 A","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 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 690 V":"1 A","at 40 °C":"1x 16 mm²","at 60 °C":"1x 25 mm²","Attachable":"0","Arcing Time":"10 ... 10 ms","Rated Value":"24 V","description":"capacitor contactor, AC-6b 33 kVAr, / 400 V, 3-pole, 24 V DC, auxiliary contacts: 1 NO + 2 NC, screw terminal, size: S0","Initial Value":"0.8","During Storage":"-55 ... +80 °C","Of Magnet Coil":"Screw-type terminals","Type Of Voltage":"DC","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","Full-Scale Value":"1.1","at 230 V maximum":"100 1/h","at 240 V maximum":"100 1/h","at 400 V maximum":"100 1/h","at 480 V maximum":"70 1/h","at 500 V maximum":"65 1/h","at 600 V maximum":"45 1/h","at 690 V maximum":"36 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":"S0","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","Instantaneous Contact":"1","For Main Current Circuit":"screw-type terminals","Relative Humidity Minimum":"10 %","Of Main Circuit Rated Value":"6 kV","Substance Prohibitance (Date)":"05/01/2014","For Grounded Parts At The Side":"10 mm","Of Auxiliary Circuit Rated Value":"6 kV","For Auxiliary And Control Circuit":"screw-type terminals","at DC at 24 V maximum permissible":"16 mA","Product Extension Auxiliary Switch":"No","closing power of magnet coil at DC":"5.9 W","holding power of magnet coil at DC":"5.9 W","At Contactor For Auxiliary Contacts":"Screw-type terminals","at 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)":"150 000","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","number of NC contacts for auxiliary contacts":"2","number of NO contacts for auxiliary contacts":"1","Type Of Voltage Of The Control Supply Voltage":"DC","contact rating of auxiliary contacts according to UL":"A600 / Q600","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","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":"10 ... 4","For Short-Circuit Protection Of The Main Circuit With Type Of Coordination 1 Required":"gG: 100 A (690 V, 50 kA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/36dd2efac410d81a7399adb948b76e7c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=243314&mlfb=3RT2628-1BB45"},"ai":{"faq":[{"question":"What is 3RT2628-1BB45's listed depth?","answer":"The 3RT2628-1BB45 has a depth of 165 mm, a width of 45 mm, and a height of 150 mm. These dimensions define the S0 frame size and the DIN rail footprint."},{"question":"What solid conductor sizes does 3RT2628-1BB45 accept?","answer":"The screw terminals accept solid conductors in these configurations: 2x (0.5–1.5 mm²), 2x (0.75–2.5 mm²), or 2x 4 mm². Stranded conductors accept 2x (1–2.5 mm²) or 2x (2.5–10 mm²)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2628-1BB45","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/3RT2628-1BB45 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}