{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-4BC50-0AB1","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-4BC50-0AB1","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-4BC50-0AB1","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-4BC50-0AB1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-400 pre-assembled front connector, 6ES7921-4BC50-0AB1, 48-pole, 2.5 m braided-shield cable, screw terminals, rated 60 V / 1 A.","salesMarkdown":"The 6ES7921-4BC50-0AB1 is a pre-assembled front connector for SIMATIC S7-400 racks, built specifically for analog I/O modules. It comes with a 2.5 m braided-shield cable and 48 poles terminated at the connector end; the field end is four round cables, 0.14 mm² each, ready for screw terminals. Rated at 60 V and 1 A per pole, with a total current limit of 2 A across the assembly. Mounts directly onto the S7-400 front connector slot — no adapter or end cover plate required. The cable exits at the top of the connector, which keeps the wiring bundle above the module row and clear of adjacent slots. Braided shield is continuous from the module pins to the field cable, so you get a single-point ground path back to the panel ground bar. For analog signals that's the difference between a clean 4-20 mA loop and a 50 Hz hum that takes half a shift to chase. Operating temperature range is 0 to 60 °C, storage from -30 to +70 °C. Screw-type terminals on the field end accept 0.14 mm² conductors; the connector side is pre-wired, so no crimping or soldering at the module end.","metaTitle":"6ES7921-4BC50-0AB1 SIMATIC S7-400 Front Connector, 2.5 m, 48","metaDescription":"Active-production pre-assembled front connector for SIMATIC S7-400 analog I/O modules. 48 poles, 2.5 m braided-shield cable, screw terminals, rated 60 V / 1 A. Sourced to order aga","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Accessories"],"specifications":{"title":"6ES7921-4BC50-0AB1","Length":"2.5 m","Rated Value":"60 V","description":"Front connector S7-400 for analog Pre-assembled with 4 round Cables 0.14 mm2, L = 2.5 m for analog 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":"Analog I/O modules","at DC / rated value":"24 V","Design Of The Shield":"braided shield","Overvoltage Category":"2","Current / Rated Value":"1 A","Operating Temperature":"0 ... 60 °C","Wire Length / Maximum":"2.5 m; between front connector module and terminal module","Total Current / Maximum":"2 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":"$350.00","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=12836&mlfb=6ES7921-4BC50-0AB1"},"ai":{"faq":[{"question":"What is the cable length and pole count?","answer":"The pre-assembled cable is 2.5 m long, and the front connector has 48 poles."},{"question":"What voltage and current is this connector rated for?","answer":"Rated voltage is 60 V DC, with a rated current of 1 A per pole and a total current limit of 2 A across the assembly."},{"question":"Does this connector include a shield?","answer":"Yes, the cable has a braided shield, which is continuous from the module pins to the field cable for a single-point ground path."},{"question":"What type of field connection does it use?","answer":"The field end terminates in four round cables (0.14 mm²) with screw-type terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-4BC50-0AB1","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/6ES7921-4BC50-0AB1 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}}