{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2628-1AB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2628-1AB05","canonicalUrl":"https://aoctrl.com/siemens/3RT2628-1AB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2628-1AB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS capacitor contactor, 3RT2628-1AB05, S0 size, 45 mm width, 24 V AC coil, screw-type terminals, screw and snap-on mounting onto 35 mm DIN rail.","salesMarkdown":"It's a dedicated piece — not a general-purpose contactor pressed into capacitor duty. The 24 V AC coil with screw-type terminals is the control interface. Rated for 6 A at 230 V, 3 A at 400 V, and 1 A at 690 V, so the switching capacity drops as voltage rises — that's the capacitor inrush curve, not a linear derating. Width is 45 mm, height 150 mm, depth 155 mm. That 45 mm footprint is tight for an S0 frame — leaves room on the rail for the upstream breaker and the controller. Solid conductors accepted: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². Stranded: 2x (1 to 2.5 mm²) or 2x (2.5 to 10 mm²). That 10 mm² stranded max on the power path is generous for an S0 — handles the capacitor bank feed without needing a lug adapter. The screw-type terminals are the traditional field-proven interface; no push-in, but also no tool-specific requirement. The contactor has one instantaneous contact. Switching times at AC: 4 to 16 ms. Arcing time is 10 ms. Those numbers matter for coordinating with the upstream fuse or breaker — the arc has to clear before the OCPD sees the fault as a sustained event. ## Operating Limits and Switching Frequency Maximum switching frequency at 230 V, 240 V, and 400 V is 100 operations per hour. That drops to 70/h at 480 V, 65/h at 500 V, 45/h at 600 V, and 36/h at 690 V. The frequency limit is voltage-dependent because higher voltages mean longer arc extinction and more thermal stress on the contacts. For a capacitor bank that cycles with every power-factor correction step, 100/h is usually plenty — but if you're switching every 36 seconds at 400 V, you're at the limit.","metaTitle":"Siemens 3RT2628-1AB05 SIRIUS Capacitor Contactor, 45mm, 24V","metaDescription":"Siemens 3RT2628-1AB05 SIRIUS capacitor contactor, S0 size, 45mm wide, 24V AC coil, screw terminals. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"155 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"45 mm","at AC":"4 ... 16 ms","title":"3RT2628-1AB05","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 50 Hz":"0.8 ... 1.1","at 690 V":"1 A","at 40 °C":"1x 16 mm²","at 60 °C":"1x 25 mm²","Attachable":"0","Arcing Time":"10 ... 10 ms","description":"capacitor contactor, AC-6b 33 kVAr, / 400 V, 3-pole, 24 V AC, 50 Hz, auxiliary contacts: 1 NO + 2 NC, screw terminal, size: S0","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":"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","at 50 Hz rated value":"24 V","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","Product Extension Auxiliary Switch":"No","at AC at 230 V maximum permissible":"7 mA","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)":"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","apparent holding power of magnet coil at AC":"9.8 VA","apparent pick-up power of magnet coil at AC":"77 VA","number of NC contacts for auxiliary contacts":"2","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":"0.82","Of Main Circuit With Degree Of Pollution 3 Rated Value":"690 V","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Inductive Power Factor With The Holding Power Of The Coil":"0.25","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=286996&mlfb=3RT2628-1AB05"},"ai":{"faq":[{"question":"What are the key ratings for the 3RT2628-1AB05?","answer":"It's a capacitor contactor rated 6 A at 230 V AC, 3 A at 400 V AC, and 1 A at 690 V AC. Coil is 24 V AC, screw-type terminals. S0 frame size, 45 mm wide, mounts on 35 mm DIN rail."},{"question":"Where can I buy the 3RT2628-1AB05?","answer":"This part is sourced to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position."},{"question":"Will the 3RT2628-1AB05 drop into a panel designed for the 3RT2526-1AB00?","answer":"Both are S0 frame capacitor contactors on the same 45 mm DIN-rail footprint, so the mechanical fit is the same. The 3RT2628-1AB05 has a 24 V AC coil; the 3RT2526-1AB00 coil voltage would need to be verified against your control circuit. Wiring terminals are screw-type on both — no rewiring of the termination method required."},{"question":"What compliance documentation is available for the 3RT2628-1AB05?","answer":"As a Siemens SIRIUS product, it carries CE marking for the European market and is designed to meet relevant IEC standards. Specific RoHS, REACH, and UL documentation should be requested at quote time to match your compliance requirements."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2628-1AB05","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/3RT2628-1AB05 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}}