{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"6ES7921-5AJ00-0AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"6ES7921-5AJ00-0AA0","canonicalUrl":"https://aoctrl.com/siemens/6ES7921-5AJ00-0AA0","factsUrl":"https://aoctrl.com/api/mcp/products/6ES7921-5AJ00-0AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC S7-1500 front connector module, 6ES7921-5AJ00-0AA0, 40-pole, 24 V rated, 1 A rated current, push-in terminals for power supply.","salesMarkdown":"The Siemens 6ES7921-5AJ00-0AA0 is a front connector module for the SIMATIC S7-1500 system. It provides the physical wiring interface between the I/O module and field devices, carrying 40 poles across its connector body. Rated at 24 V and 1 A, it is designed for use with 2A output modules, meaning it handles the control-side current draw of the module's output channels without exceeding the connector's thermal limits. The module mounts directly to the S7-1500 I/O module, with terminals positioned at the top for straightforward wiring access in a crowded cabinet. ## Wiring and Connection Details The connecting cable uses a plug-in IDC connector with 16 poles. Strip length is 8 mm for the power supply terminals, matching the standard for push-in terminations on this class of Siemens I/O. A 3.5 mm screwdriver blade is specified for any release action. The module provides four terminals arranged as 2 x L+ and 2 x M, suitable for daisy-chaining the 24 V supply to adjacent modules without additional distribution blocks. Maximum total current through the module is 3 A when mounted horizontally, so the 24 V supply loop must be fused or limited below this threshold to avoid connector overheating. ## Environmental and Lifecycle Status Rated for operation from 0 to 60 °C and storage from -40 to +70 °C, with pollution degree 2 and overvoltage category II — standard for clean, controlled industrial environments like panel interiors. ## Sourcing and Fit Decision Maximum wire length between this front connector module and the remote terminal module is 30 m, which governs how far field devices can be located from the S7-1500 rack.","metaTitle":"Siemens 6ES7921-5AJ00-0AA0 Front Connector Module for SIMATI","metaDescription":"Siemens 6ES7921-5AJ00-0AA0 front connector module for SIMATIC S7-1500. Rated 24 V, 1 A, 40 poles. Mature lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["PLC Accessories"],"specifications":{"title":"6ES7921-5AJ00-0AA0","Stranded":"0.5 ... 1.5 mm²","Rated Value":"24 V","description":"Front connector module with 1x16 pole IDC connector for digital 2 A output modules of the S7-1500 Potential supply over Push-in terminal","Mounting Type":"direct mounting","Target System":"SIMATIC S7-1500","During Storage":"-40 ... +70 °C","Number Of Poles":"40; of the front connector","Stripped Length":"8 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":"3 A; for mounting position horizontal","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":"0.5 ... 1.5 mm²","Product Component / Required / End Cover Plate":"No","with plastic sleeve / according to DIN 46228-4":"Length 8mm to 9mm","Type Of Electrical Connection / For Power Supply":"Push-In 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 46228/1 or DIN 46228/4 with plastic collar max. 0.75 mm2","without plastic sleeve / according to DIN 46228-1":"Length 8mm to 9mm","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":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=34728&mlfb=6ES7921-5AJ00-0AA0"},"ai":{"faq":[{"question":"What are the key electrical ratings for this front connector?","answer":"Rated voltage is 24 V DC, rated current is 1 A per channel, and the maximum total current through the module is 3 A when mounted horizontally."},{"question":"What wire sizes does this connector accept?","answer":"It accepts stranded conductors from 0.5 to 1.5 mm² for the power supply terminals, and finely stranded wire with core-end processing from 0.25 to 1.5 mm²."},{"question":"How do I source this part?","answer":"This part is in mature production and can be quoted to order against an RFQ through standard Siemens distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/6ES7921-5AJ00-0AA0","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/6ES7921-5AJ00-0AA0 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}}