{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-3AH00-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-3AH00-1AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-3AH00-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-3AH00-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-300 front connector, 20-pole, for crimp contacts, rated 60 V / 1 A, stranded 0.5–1 mm², VPE 100 units.","salesMarkdown":"## What this front connector does in an S7-300 rack The Siemens 6ES7921-3AH00-1AA0 is a 20-pole front connector for SIMATIC S7-300 I/O modules, designed for crimp-contact termination. It bridges the field wiring (sensors, actuators) to the module's internal bus via a 16-pole IDC interface for the connecting cable. Rated at 60 V and 1 A per contact, it handles standard 24 V DC discrete signals and low-current analog loops common in S7-300 racks. The 20-pole count matches the full-width I/O modules in the S7-300 family — think 16-channel digital input or output cards, or mixed analog modules. Stranded conductors from 0.5 to 1 mm² are accepted; finely stranded wire with core-end processing (ferrules) up to 1.5 mm² fits as well. The 60 V rated value is the maximum voltage between any two pins. The 1 A rated current per contact is the continuous thermal limit. Mounting is direct onto the S7-300 module — no DIN rail or additional bracket needed. The connector seats at the top of the module, with terminals facing upward for wiring access. The enclosure is black, insulating body material is specified as 'other' (likely a high-temperature thermoplastic). Degree of pollution 2 and overvoltage category 2 are standard for control cabinet environments — no special spacing or creepage requirements beyond typical panel practice. No end cover plate is required, so the connector is self-contained once wired.","metaTitle":"Siemens 6ES7921-3AH00-1AA0 S7-300 Front Connector, 20 Pole","metaDescription":"SIMATIC S7-300 front connector for crimp contacts, 20-pole, rated 60 V / 1 A, stranded 0.5–1 mm². Mature lifecycle, sourced to order. For I/O module wiring in S7-300 racks.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["PLC Accessories"],"specifications":{"title":"6ES7921-3AH00-1AA0","Stranded":"0.5 ... 1 mm²","Rated Value":"60 V","description":"SIMATIC S7-300, Front connector for crimp contacts, without crimp contacts 20 pole, VPE=100 units","Mounting Type":"direct mounting","Target System":"SIMATIC S7-300","During Storage":"-40 ... +70 °C","Number Of Poles":"20; 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,"stockQuantity":0,"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=502650&mlfb=6ES7921-3AH00-1AA0"},"ai":{"faq":[{"question":"What wire sizes does this front connector accept?","answer":"It accepts stranded conductors from 0.5 to 1 mm², and finely stranded wire (with or without ferrule) from 0.25 to 1.5 mm². Solid conductors are not supported."},{"question":"What is the rated voltage and current per contact?","answer":"Rated voltage is 60 V DC maximum, and rated current is 1 A per contact. This is sufficient for 24 V DC discrete signals and low-current analog loops."},{"question":"What is the packaging quantity?","answer":"The VPE (packaging unit) is 100 units. Orders should be placed in multiples of 100."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-3AH00-1AA0","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/6ES7921-3AH00-1AA0 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}}