{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-3AD00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-3AD00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-3AD00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AD00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 front connector module, 20-pole, screw-type terminals, 60 V DC, 1 A rated, 4 A total, 0.25–1.5 mm² stranded, black enclosure.","salesMarkdown":"The Siemens 6ES7921-3AD00-0AA0 is a front connector module for the SIMATIC S7-300 system, designed to wire a 2A output module. It carries 20 poles on the front connector and provides screw-type terminals for the power supply (L+ and M, 2 x 1 each) plus a plug-in connection for the IDC cable. Rated at 60 V DC, 1 A per pole, with a total current limit of 4 A. ## Wiring and termination specs Accepts stranded wire 0.25–1.5 mm² with or without core-end processing. Solid conductors are not supported — use ferruled stranded only. Strip length is 6 mm. For the supply terminals, the wire insulation outer diameter must be ≤ 3.1 mm. Tightening torque for the screw terminals: 0.4–0.7 N·m, using a 3.5 mm screwdriver blade. Up to two wires per connection are allowed, provided the total cross-section fits in a single ferrule.","metaTitle":"Siemens 6ES7921-3AD00-0AA0 Front Connector Module, S7-300, 2","metaDescription":"Siemens 6ES7921-3AD00-0AA0 front connector module for SIMATIC S7-300. 20-pole, 60 V DC, 1 A rated, 4 A total. Screw-type terminals, 0.25–1.5 mm² stranded. Mature lifecycle, availab","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":"20; 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":"2A Output module","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":"3.1 mm; to the connection of the supply terminal","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","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 ... 1.5 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":"1"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$52.07 – $99.00","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=524460&mlfb=6ES7921-3AD00-0AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AD00-0AA0/alternatives.json"},"ai":{"faq":[{"question":"What wire sizes does 6ES7921-3AD00-0AA0 accept?","answer":"It accepts stranded wire from 0.25 to 1.5 mm², with or without core-end processing. Solid wire is not supported."},{"question":"What is the rated voltage and current for this front connector?","answer":"Rated voltage is 60 V DC. Rated current per pole is 1 A, with a total current limit of 4 A across all poles."},{"question":"Where can I buy 6ES7921-3AD00-0AA0?","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/6ES7921-3AD00-0AA0","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/6ES7921-3AD00-0AA0 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}}