{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-3AM20-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-3AM20-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-3AM20-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AM20-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 front connector module, 40-pole, screw-type terminals, rated 60 V / 1 A, for Compact CPU 313/314.","salesMarkdown":"The Siemens 6ES7921-3AM20-0AA0 is a 40-pole front connector module for the SIMATIC S7-300 family, designed to connect the I/O wiring to a Compact CPU 313 or 314. Rated at 60 V DC and 1 A per contact, with a total current limit of 4 A across all pins. That 60 V ceiling covers standard 24 V DC control loops with headroom, but keep the total draw under 4 A — the module's internal bus bar and connector are the bottleneck, not any single pin. The stranded wire range is 0.25 to 1.5 mm², and the stripped length is 6 mm; for finely stranded wire with a ferrule, the range narrows to 0.25–0.75 mm² with a 5–7 mm ferrule length per DIN 46228-1 without plastic collar. Tightening torque for the screw terminals is 0.4–0.7 N·m — a small driver, not a ratchet. ## Environmental limits and panel placement Operates from 0 to 60 °C, stores from -40 to +70 °C. The maximum cable length between this front connector module and the remote terminal module is 30 m; beyond that, voltage drop on the 24 V DC supply and signal integrity start to be a concern. The terminal position is at the top of the module, and the housing is black, non-transparent.","metaTitle":"6ES7921-3AM20-0AA0 SIMATIC S7-300 Front Connector Module, 40","metaDescription":"Siemens 6ES7921-3AM20-0AA0 front connector module for SIMATIC S7-300. 40-pole, rated 60 V / 1 A, screw-type terminals. Mature lifecycle, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Accessories"],"specifications":{"Stranded":"0.25 ... 1.5 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","Stripped Length":"6 mm","at DC / maximum":"60 V","lifecycle_stage":"mature","During Operation":"0 ... 60 °C","Degree Of Pollution":"2","Number Of Terminals":"4; 2 x 1 x L+, 2 x 1 x M","Product Designation":"Front connector module","Suitability For Use":"Compact CPU 313 / 314","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","Total Current / Maximum":"4 A","Color / Of The Enclosure":"black","Position / Of The Terminal":"at the top","Width Of Screwdriver Blade":"3.5 mm","Product Feature / Transparent":"No","Material / Of The Insulating Body":"other","Number Of Cables / Per Connection":"2; Connection for internal system: Combination of 1 or 2 Wires until the sum total of cross sections be achieved in a ferrule.","Number Of Poles / At The 1st Interface":"16; the IDC connector for the connection cable","Outer Diameter / Of The Wire Insulation":"2 mm; to the connection of the supply terminal","reference code / according to IEC 81346-2":"XG","Finely Stranded / With Core End Processing":"0.25 ... 0.75 mm²","Finely Stranded / Without Core End Processing":"0.25 ... 0.75 mm²","Tightening Torque / With Screw-Type Terminals":"0.4 ... 0.7 N·m","Product Component / Required / End Cover Plate":"No","Type Of Electrical Connection / For Power Supply":"Screw-type terminal","design tested acc. to type of protection / EEx e":"No","For Flexible Conductor / With Core End Processing":"0.25 ... 0.75 mm²; End sleeve according to DIN 46228 without plastic collar","without plastic sleeve / according to DIN 46228-1":"Length 5mm to 7mm","Type Of Connectable Conductor Cross-Sections / Solid":"No","Type Of Electrical Connection / For Connecting Cable":"Plug-in connection","Number Of The Plug Contacts / Of The Electrical Connection":"3"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$129.00","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=361995&mlfb=6ES7921-3AM20-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AM20-0AA0/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 6ES7921-3AM20-0AA0 and how do I get a price?","answer":"This part is sourced to order through independent distribution. Submit an RFQ — availability and current pricing are confirmed at quote time."},{"question":"What is the stranded wire range for 6ES7921-3AM20-0AA0?","answer":"The stranded wire range is 0.25 to 1.5 mm²; for finely stranded wire with a ferrule, the range is 0.25 to 0.75 mm² with a 5–7 mm ferrule length without plastic collar."},{"question":"What is the rated voltage of 6ES7921-3AM20-0AA0?","answer":"The rated voltage is 60 V DC, with a rated current of 1 A per contact and a total current limit of 4 A."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-3AM20-0AA0","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/6ES7921-3AM20-0AA0 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}}