{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-3AB20-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-3AB20-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-3AB20-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AB20-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 front connector module, 6ES7921-3AB20-0AA0, 40-pole, screw-type terminals, rated 60 V / 1 A, for digital I/O modules.","salesMarkdown":"The Siemens 6ES7921-3AB20-0AA0 is a 40-pole front connector module for SIMATIC S7-300 digital I/O modules. It uses screw-type terminals for the power supply and a plug-in connection for the signal cable, rated at 60 V and 1 A per pole with a total current capacity of 4 A. Accepts stranded conductors from 0.25 to 0.75 mm², with or without core-end processing. Stripped length is 6 mm; use a 3.5 mm screwdriver blade and torque to 0.4–0.7 N·m. Up to two wires per connection are allowed when the combined cross-section fits within a single ferrule. The module mounts directly onto the S7-300 rail. The 40-pole IDC connector at the first interface handles the signal cable; the supply terminals sit at the top of the module. Overvoltage category II, pollution degree 2. The lifecycle stage is mature — meaning it's an established, stable product in Siemens' catalog, not recently introduced nor flagged for discontinuation.","metaTitle":"Siemens 6ES7921-3AB20-0AA0 S7-300 Front Connector Module, 40","metaDescription":"Siemens 6ES7921-3AB20-0AA0 front connector module for SIMATIC S7-300 digital I/O. Rated 60 V, 1 A per pole, 4 A total. Screw-type terminals, 0.25-0.75 mm² stranded. Mature lifecycl","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Accessories"],"specifications":{"Stranded":"0.25 ... 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","Stripped Length":"6 mm","at DC / maximum":"60 V","lifecycle_stage":"mature","During Operation":"0 ... 60 °C","Degree Of Pollution":"2","Number Of Terminals":"8; 4 x 1 x L+, 4 x 1 x M","Product Designation":"Front connector module","Suitability For Use":"Digital 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","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":"4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.46","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=39973&mlfb=6ES7921-3AB20-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AB20-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What is the stranded wire range for 6ES7921-3AB20-0AA0?","answer":"It accepts stranded conductors from 0.25 to 0.75 mm², with or without ferruled ends."},{"question":"What is the rated voltage of this front connector module?","answer":"The rated voltage is 60 V DC."},{"question":"Where can I buy 6ES7921-3AB20-0AA0?","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/6ES7921-3AB20-0AA0","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/6ES7921-3AB20-0AA0 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}}