{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-4BF00-0AA1","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-4BF00-0AA1","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-4BF00-0AA1","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-4BF00-0AA1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-400 pre-assembled front connector, 6ES7921-4BF00-0AA1, 48 poles, 5 m cable, rated 60 V / 1 A, for digital I/O modules.","salesMarkdown":"The Siemens 6ES7921-4BF00-0AA1 is a pre-assembled front connector for SIMATIC S7-400 digital I/O modules. It brings 48 poles on a 5 m cable, rated at 60 V and 1 A per contact, with a total current capacity of 4 A. This is the factory-assembled version — no field wiring of the connector itself, just plug and route the round cables to the terminal module. The 60 V rated value covers the typical 24 V DC digital I/O signals in an S7-400 rack, with headroom for 48 V field devices if needed. The 1 A per contact is generous for standard digital inputs (typically 10–20 mA) and smaller outputs; the 4 A total limit across all 48 poles means you can't sink a full amp on every channel simultaneously — realistic for mixed I/O but worth noting if you're grouping high-current outputs on one connector. The 5 m cable length is the maximum run between the front connector and the terminal module; plan your cabinet layout accordingly. Mounts directly to the S7-400 digital I/O module — no adapter or backplane wiring needed. The screw-type terminals on the cable end accept 0.14 mm² round conductors (pre-assembled). Position the terminal module within 5 m of the rack; the cable exits at the top of the connector. No end cover plate required.","metaTitle":"Siemens 6ES7921-4BF00-0AA1 S7-400 Front Connector, 5m, 48-po","metaDescription":"Pre-assembled front connector for SIMATIC S7-400 digital I/O modules. 48 poles, 5 m cable, rated 60 V / 1 A. Active production. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Accessories"],"specifications":{"title":"6ES7921-4BF00-0AA1","Length":"5 m","Rated Value":"60 V","description":"Front connector S7-400 for digital Pre-assembled with 4 round Cables 0.14 mm2, L = 5.0 m for digital connection modules","Mounting Type":"direct mounting","Target System":"SIMATIC S7-400","During Storage":"-30 ... +70 °C","Number Of Poles":"48; of the front connector","at DC / maximum":"30 V","lifecycle_stage":"mature","During Operation":"0 ... 60 °C","Degree Of Pollution":"2","Product Designation":"Pre-assembled front connector","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":"5 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","Product Feature / Transparent":"No","Material / Of The Insulating Body":"other","Number Of Poles / At The 1st Interface":"Cable is directly connected","reference code / according to IEC 81346-2":"WG","Product Component / Required / End Cover Plate":"No","design tested acc. to type of protection / EEx e":"No","Type Of Electrical Connection / For Connecting Cable":"Screw-type terminal"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$426.00","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=375045&mlfb=6ES7921-4BF00-0AA1"},"ai":{"faq":[{"question":"What is the cable length and voltage rating?","answer":"The pre-assembled cable is 5 m long, rated at 60 V DC maximum. The rated current per contact is 1 A, with a total current limit of 4 A across all 48 poles."},{"question":"Can this connector be used with S7-300 or other PLC systems?","answer":"No — this connector is designed specifically for SIMATIC S7-400 digital I/O modules. The 48-pole interface and mounting geometry are unique to that platform."},{"question":"What is the operating temperature range?","answer":"The connector is rated for operation from 0 to 60 °C, with storage from -30 to +70 °C. Pollution degree 2 and overvoltage category II apply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-4BF00-0AA1","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/6ES7921-4BF00-0AA1 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}}