{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2637-1AB05","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2637-1AB05","canonicalUrl":"https://aoctrl.com/siemens/3RT2637-1AB05","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AB05","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS, capacitor contactor, 3RT2637-1AB05, size S2, 6 A at 230 V AC, 24 V AC coil, screw/snap-on 35 mm DIN rail mounting.","salesMarkdown":"The 3RT2637-1AB05 is a SIRIUS capacitor contactor from Siemens, size S2, built for switching capacitor banks in power-factor correction panels. Its job is to handle the inrush currents that pop up when you slam a capacitor bank onto the line — a regular contactor will weld its contacts doing that job. The coil termination uses screw-type terminals, so you're not fighting cage clamps out here in the grease. That's handy when you're squeezing it into a crowded panel next to the capacitor bank. Dimensions are 65 mm wide, 114 mm tall, 130 mm deep — standard S2 footprint, so it'll drop into any panel laid out for that size. The real work is the inrush, which this contactor handles without welding. Switching frequency tops out at 100 operations per hour at 230 V, 400 V, and 240 V; drop to 50/h at 480 V, 45/h at 500 V, 32/h at 600 V, and 25/h at 690 V. That's the thermal limit of the arc chute — respect those numbers if you're cycling capacitors hard. ## Wiring and conductor sizing The main power terminals accept solid conductors: 2x (0.5 to 1.5 mm²), 2x (0.75 to 2.5 mm²), or 2x 4 mm². For stranded, they take 2x (10 to 35 mm²) or 1x (10 to 50 mm²). At 40 °C ambient, you can land a single 50 mm²; at 60 °C, two 35 mm². That's enough copper for the capacitor bank feed. The auxiliary contacts — one instantaneous contact — are rated 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, 3 A at 400 V, and 0 A at 690 V. Use those for the control circuit feedback, not the main power.","metaTitle":"Siemens SIRIUS 3RT2637-1AB05 Capacitor Contactor, 6A at 230V","metaDescription":"Siemens SIRIUS 3RT2637-1AB05 capacitor contactor, size S2. Rated 6A at 230V AC, 24V coil. Screw/snap-on DIN rail mount. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Contactors"],"specifications":{"Depth":"130 mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²), 2x 4 mm²","Width":"65 mm","at AC":"10 ... 18 ms","Height":"114 mm","at 24 V":"6 A","at 60 V":"2 A","Stranded":"2x (10 ... 35 mm²), 1x (10 ... 50 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":"100 1/h","at 240 V maximum":"100 1/h","at 400 V maximum":"100 1/h","at 480 V maximum":"50 1/h","at 500 V maximum":"45 1/h","at 600 V maximum":"32 1/h","at 690 V maximum":"25 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":"S2","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":"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":"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)":"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":"16 VA","apparent pick-up power of magnet coil at AC":"190 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":"0.72","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":"0.37","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":"18 ... 0","For Short-Circuit Protection Of The Main Circuit With Type Of Coordination 1 Required":"gG: 200 A (690 V, 50 kA)"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3a0b388ceab6919b20645f4ff59e8677.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=336413&mlfb=3RT2637-1AB05","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AB05/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RT2637-1AB05 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is 3RT2637-1AB05's listed depth?","answer":"130 mm, with a width of 65 mm and height of 114 mm — standard S2 contactor footprint."},{"question":"Will 3RT2637-1AB05 drop into a panel specified around 3RT2535-1AB00?","answer":"No — the 3RT2535-1AB00 is a size S0 frame, while this is S2. The DIN rail footprint and panel cutout are different; you'd need to re-lay the rail or enlarge the mounting area."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2637-1AB05","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/3RT2637-1AB05 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}}