{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT2637-1AV03","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT2637-1AV03","canonicalUrl":"https://aoctrl.com/siemens/3RT2637-1AV03","factsUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AV03","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT2637-1AV03 capacitor contactor, AC-6b 75 kVAr at 400 V, 3-pole, 400 V AC 50 Hz coil, 1 NO + 1 NC auxiliary contacts, screw terminals, frame size S2.","salesMarkdown":"The Siemens 3RT2637-1AV03 is a capacitor contactor from the SIRIUS series, rated AC-6b 75 kVAr at 400 V for switching capacitive loads. The 3-pole configuration with a 400 V AC 50 Hz coil and screw terminals fits standard panel layouts. Size S2 frame keeps the DIN-rail footprint compact for power-factor correction banks. ## What the AC-6b rating means for fit AC-6b is the IEC utilization category for switching capacitor banks. The 75 kVAr at 400 V rating governs the maximum reactive power this contactor can make and break without welding or excessive wear. That figure assumes a 50 Hz supply; the inrush current from discharged capacitors is typically 20–30× rated current, so the contactor's design margin in AC-6b is what protects the bank and the panel. A standard AC-3 motor-rated contactor of similar frame size would not survive repeated capacitor switching. Screw terminals accept 1.5–6 mm² stranded or solid copper. The 400 V AC coil draws its rated VA at pickup and lower holding VA — verify the control transformer is sized for the inrush if multiple contactors pull in simultaneously. The auxiliary contacts are electrically isolated from the main poles, so feedback wiring to a PLC input is straightforward.","metaTitle":"Siemens 3RT2637-1AV03 Capacitor Contactor, AC-6b 75 kVAr, 40","metaDescription":"Siemens 3RT2637-1AV03 capacitor contactor, AC-6b 75 kVAr at 400 V, 3-pole, 400 V AC 50 Hz coil, 1NO+1NC aux, screw terminals, size S2. Current lifecycle stage, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"lifecycle_stage":"current"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/cea9e657271b21b282a344d4b6adc94e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1687156&mlfb=3RT2637-1AV03","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT2637-1AV03/alternatives.json"},"ai":{"faq":[{"question":"What is 3RT2637-1AV03's AC-6b rating?","answer":"It is rated AC-6b 75 kVAr at 400 V, 3-pole, with a 400 V AC 50 Hz coil, 1 NO + 1 NC auxiliary contacts, screw terminals, and size S2 frame."},{"question":"Where can I buy 3RT2637-1AV03?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution; availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RT2637-1AV03","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/3RT2637-1AV03 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}}