{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-3AH20-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-3AH20-1AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-3AH20-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AH20-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 front connector, 40-pole, for crimp contacts, rated 60 V / 1 A, accepts 0.5–0.75 mm² stranded wire, VPE 100 units, part number 6ES7921-3AH20-1AA0.","salesMarkdown":"The Siemens 6ES7921-3AH20-1AA0 is a 40-pole front connector for the SIMATIC S7-300 system, designed to terminate I/O module wiring via crimp contacts. It accepts stranded conductors from 0.5 to 0.75 mm² and is rated at 60 V / 1 A. The connector mounts directly onto the S7-300 rail and positions the terminals at the top for straightforward panel wiring. The connector uses a crimp-contact termination for the power supply and a plug-in connection for the I/O cable. The 40-pole IDC interface at the first connector position mates with the S7-300 I/O module's backplane. Maximum cable length between the front connector module and the terminal module is 30 m. The insulating body material is listed as 'other' — not standard thermoplastic — so verify compatibility with your panel's environmental rating if the assembly sees aggressive solvents or continuous elevated humidity. The connector is supplied without crimp contacts, so order those separately. VPE is 100 units, which matters for project planning: one bag covers a rack of 20 modules with two spare connectors.","metaTitle":"Siemens 6ES7921-3AH20-1AA0 SIMATIC S7-300 40-pole front conn","metaDescription":"Siemens 6ES7921-3AH20-1AA0 SIMATIC S7-300 front connector, 40-pole, rated 60 V / 1 A, accepts 0.5–0.75 mm² stranded. Mature lifecycle. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Accessories"],"specifications":{"Stranded":"0.5 ... 0.75 mm²","Rated Value":"60 V","Mounting Type":"direct mounting","Target System":"SIMATIC S7-300","During Storage":"-40 ... +70 °C","Number Of Poles":"40; of the front connector","at DC / maximum":"60 V","lifecycle_stage":"mature","During Operation":"0 ... 60 °C","Degree Of Pollution":"2","Product Designation":"Front connector","Suitability For Use":"I/O modules","at DC / rated value":"24 V","Overvoltage Category":"2","Current / Rated Value":"1 A","Operating Temperature":"0 ... 60 °C","Wire Length / Maximum":"30 m; between front connector module and terminal module","Color / Of The Enclosure":"black","Position / Of The Terminal":"at the top","Product Feature / Transparent":"No","Material / Of The Insulating Body":"other","Number Of Poles / At The 1st Interface":"16; the IDC connector for the connection cable","reference code / according to IEC 81346-2":"XG","Finely Stranded / With Core End Processing":"0.25 ... 1.5 mm²","Finely Stranded / Without Core End Processing":"0.25 ... 1.5 mm²","Product Component / Required / End Cover Plate":"No","Type Of Electrical Connection / For Power Supply":"crimp contact","design tested acc. to type of protection / EEx e":"No","For Flexible Conductor / With Core End Processing":"0.25 ... 1.5 mm²; End sleeve according to DIN 46228 without plastic collar","Type Of Connectable Conductor Cross-Sections / Solid":"No","Type Of Electrical Connection / For Connecting Cable":"Plug-in connection"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6d57f154fff616166253fab8c566f5cb.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=61723&mlfb=6ES7921-3AH20-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AH20-1AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 6ES7921-3AH20-1AA0 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What wire sizes does 6ES7921-3AH20-1AA0 accept?","answer":"It accepts stranded conductors from 0.5 to 0.75 mm². Finely stranded wire with core-end processing is accepted from 0.25 to 1.5 mm²."},{"question":"What is the rated voltage and current of 6ES7921-3AH20-1AA0?","answer":"Rated voltage is 60 V DC maximum, and rated current is 1 A."},{"question":"Does 6ES7921-3AH20-1AA0 include crimp contacts?","answer":"No, the connector is supplied without crimp contacts. They must be ordered separately."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-3AH20-1AA0","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/6ES7921-3AH20-1AA0 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}}