{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RT1627-1AN21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RT1627-1AN21","canonicalUrl":"https://aoctrl.com/siemens/3RT1627-1AN21","factsUrl":"https://aoctrl.com/api/mcp/products/3RT1627-1AN21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RT1627-1AN21 capacitor contactor, AC-6 duty, 25 kVAr / 400 V, 220 V AC 50/60 Hz coil, 3-pole, Size S0, screw terminals, IP20 front / IP00 terminal, DIN rail mount.","salesMarkdown":"## Capacitor switching contactor, AC-6 rated, 25 kVAr at 400 V The Siemens 3RT1627-1AN21 is a capacitor contactor from the SIRIUS family, designed specifically for switching capacitor banks in power factor correction (PFC) applications. Its AC-6 duty rating of 25 kVAr at 400 V means it handles the high inrush currents typical of capacitor charging without welding the main contacts — a standard contactor would fail prematurely here. The coil is 220 V AC, 50/60 Hz, and the contactor provides 3 normally open main contacts plus 1 normally open auxiliary contact, all terminated with screw-type terminals. This part is a phased-out product. The manufacturer lists the successor as the SIRIUS 3RT2 series — the same S0 frame size and similar electrical ratings, so a panel swap should be straightforward. The S0 footprint is 45 mm wide, 100 mm tall, and 135 mm deep — that depth is a bit more than the standard S0 contactor (typically ~91 mm) because of the integrated surge-suppression network for capacitor switching. Side-by-side mounting is allowed with no spacing, so you can pack several units on a rail for multi-step PFC banks. Front protection is IP20; the terminals are IP00, meaning the wiring area is not finger-safe — keep the panel door closed or add terminal shrouds. ## What the AC-6 rating means for your PFC bank The AC-6 duty class is specific to capacitor switching. The 25 kVAr at 400 V rating corresponds to a capacitor current of about 36 A, but the contactor must handle the peak inrush — up to 100 times the rated current for a few milliseconds. The 3RT1627-1AN21 is built with damping resistors and a dedicated switching sequence to limit that surge. If you are replacing a failed unit, verify the capacitor bank size does not exceed 25 kVAr per step; for larger banks, step up to the next SIRIUS frame size.","metaTitle":"Siemens 3RT1627-1AN21 Capacitor Contactor, 25 kVAr / 400 V,","metaDescription":"Siemens 3RT1627-1AN21 capacitor contactor, AC-6 rated 25 kVAr at 400 V, 220 V AC 50/60 Hz coil, 3 NO main + 1 NO aux, IP20 front, screw terminals, DIN rail mount. Phased-out; succe","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Contactors"],"specifications":{"Depth":"135 mm","Width":"45 mm","Height":"100 mm","On The Front":"IP20","Of The Terminal":"IP00","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","protection class IP":"IP20","at 50 Hz rated value":"220 ... 220 V","at 60 Hz rated value":"220 ... 220 V","Side-By-Side Mounting":"Yes","For Main Current Circuit":"screw-type terminals","at AC-1 at 400 V rated value":"35 A","Substance Prohibitance (Date)":"01.07.2006 00:00:00","For Auxiliary And Control Circuit":"screw-type terminals","reference code acc. to IEC 81346-2":"Q","Ambient Temperature During Operation":"-25 ... +60 °C","number of NC contacts for main contacts":"0","number of NO contacts for main contacts":"3","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"1","Identification Number And Letter For Switching Elements":"1","Supply Voltage Frequency For Auxiliary And Control Circuit Rated Value":"50 ... 60 Hz"}},"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=15034&mlfb=3RT1627-1AN21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RT1627-1AN21/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3RT1627-1AN21?","answer":"The closest functional match is the successor series SIRIUS 3RT2, which shares the same S0 frame size and similar electrical ratings. The older peer 3RT1025-1AN24 is also an S0 power contactor but lacks the dedicated AC-6 capacitor switching rating — it is rated for motor loads (AC-3) and would not handle capacitor inrush reliably."},{"question":"Will 3RT1627-1AN21 drop into a panel specified for 3RT1025-1AN24?","answer":"The 3RT1627-1AN21 is 135 mm deep versus the 3RT1025-1AN24's 140 mm depth, and 100 mm tall versus 85 mm — so the footprint is slightly different. The width is the same 45 mm, and both mount on 35 mm DIN rail. Check the panel depth clearance; the 3RT1627 is 5 mm shallower but 15 mm taller, so a pre-drilled gland plate or busbar arrangement for the 3RT1025 may need adjustment."},{"question":"Where can I buy 3RT1627-1AN21?","answer":"We source this phased-out part through independent distribution and quote it to order against an RFQ. 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/3RT1627-1AN21","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/3RT1627-1AN21 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}}