{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6SL3121-1TE21-8AA4","brand":"Siemens","brandSlug":"siemens","productSlug":"6SL3121-1TE21-8AA4","canonicalUrl":"https://aoctrl.com/siemens/6SL3121-1TE21-8AA4","factsUrl":"https://aoctrl.com/api/mcp/products/6SL3121-1TE21-8AA4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SINAMICS S120 Single Motor Module, spare part, 6SL3121-1TE21-8AA4, input 600 V DC, output 400 V 3 AC, 18 A, booksize, external air cooling, optimized pulse patterns, extended Safety Integrated functions incl. DRIVE-CLiQ cable.","salesMarkdown":"## SINAMICS S120 Single Motor Module, 18 A — Spare-Part Fit The Siemens 6SL3121-1TE21-8AA4 is a spare-part SINAMICS S120 Single Motor Module in booksize format, fed from a 600 V DC link and delivering 400 V three-phase AC at 18 A to the motor. External air cooling handles the thermal load; the module supports optimized pulse patterns and the extended Safety Integrated functions, and ships with the DRIVE-CLiQ cable included. The 600 V DC input ties directly to a SINAMICS S120 Smart Line Module or Active Line Module DC bus — no additional DC supply needed. The 18 A output at 400 V three-phase matches a roughly 7.5 kW induction motor on a pump or conveyor. Booksie construction means it slides into the common S120 booksize chassis alongside other modules, sharing the backplane cooling and DRIVE-CLiQ ring. External air cooling requires clearance above and below the module for airflow; derate if the cabinet ambient exceeds 40 °C.","metaTitle":"Siemens 6SL3121-1TE21-8AA4 SINAMICS S120 Single Motor Module","metaDescription":"Siemens 6SL3121-1TE21-8AA4 SINAMICS S120 Single Motor Module, 18 A, 600 V DC input, 400 V 3 AC output, booksize, mature lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["AC Drive (VFD) 600V"],"specifications":{"title":"6SL3121-1TE21-8AA4","description":"**spare part** SINAMICS S120 Single Motor Module input: 600 V DC output: 400 V 3 AC, 18 A type of construction: booksize external air cooling optimized pulse patterns and support of the extended Safety Integrated functions incl. DRIVE-CLiQ cable","lifecycle_stage":"mature","Datum: 29.04.2021":"Änderungen vorbehalten © Copyright Siemens 2021"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,672.21","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a813dbc5909e991f3e8cc10407b7d284.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=303882&mlfb=6SL3121-1TE21-8AA4"},"ai":{"faq":[{"question":"Where can I buy 6SL3121-1TE21-8AA4?","answer":"This module is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock or lead-time figures are published here."},{"question":"What is the closest alternative to 6SL3121-1TE21-8AA4 in the SINAMICS S120 family?","answer":"The closest peer is a booksize Single Motor Module with a different current rating — for example, a 9 A or 30 A variant. The 18 A version is the mid-range choice; there is no pin-compatible drop-in with identical firmware. Stick with this order code for a direct swap."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6SL3121-1TE21-8AA4","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/6SL3121-1TE21-8AA4 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}}