{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1408-8KE00-0AA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1408-8KE00-0AA2","canonicalUrl":"https://aoctrl.com/siemens/3RK1408-8KE00-0AA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1408-8KE00-0AA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RK1408-8KE00-0AA2 AS-i ground fault detection module, IP20, 22.5 mm width, 24 V 500 mA / 48 V 200 mA, relay output DC-12 1 A, screw terminals.","salesMarkdown":"## AS-i ground fault detection — what it does on the line The 3RK1408-8KE00-0AA2 is an AS-Interface ground fault detection module that monitors one input and provides two signaling outputs via a relay rated DC-12 1 A or DC-13 500 mA at 24 V. It does not require its own AS-i address, so it fits onto an existing segment without consuming node capacity — useful for adding diagnostic coverage to a populated AS-i network. The module detects an earth fault when the ground voltage falls between 10% and 90% of the AS-i supply voltage (Uas-i). It does not perform overvoltage detection, and it has no counter function — its job is purely ground-fault annunciation for the segment. Siemens notes that if repeaters are used, a separate ground fault detection module is required per AS-i segment (one per power supply unit). The auxiliary supply (Uaux) should be protected by a 2 A slow-blow fuse, and inductive loads on the relay should include freewheel diodes to extend contact endurance. ## Lifecycle status — NRND, sourcing path This module carries a lifecycle status of NRND (Not Recommended for New Designs). That means Siemens will continue to support existing installations but is steering new projects toward a current alternative. For BOM lines already in production, the module remains orderable through independent distribution — quoted to order against the RFQ, with availability confirmed at quote time. No official successor order code is listed by Siemens. If you are evaluating a replacement for a new panel, contact us with the application details and we can review the functional requirements against the current AS-i portfolio. ## Mounting and connections — DIN-rail footprint The module measures 22.5 mm wide, 102 mm high, and 86 mm deep — a standard S22.5 housing that snaps onto a 35 mm DIN rail or mounts directly to a panel. Protection class is IP20, so it belongs inside a cabinet, not in a washdown zone. Connections are via screw-type terminals for the inputs and outputs. The AS-i connection includes built-in polarity reversal protection, which simplifies wiring and avoids a common commissioning error. Operating temperature range is -25 to +70 °C, with storage from -40 to +85 °C. The relay is rated for 2,000,000 operating cycles under DC-12 load.","metaTitle":"Siemens 3RK1408-8KE00-0AA2 AS-i Ground Fault Module, IP20","metaDescription":"Siemens 3RK1408-8KE00-0AA2 AS-i ground fault detection module, IP20, 22.5 mm, 24 V 500 mA / 48 V 200 mA, relay output DC-12 1 A. NRND — sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"24 V":"500mA","48 V":"200mA","DC-12":"1A","Depth":"86mm","Width":"22.5mm","title":"3RK1408-8KE00-0AA2","Height":"102mm","Note 1":"If repeaters are used, a ground fault detection module must be used for each AS-Interface segment (number of AS-Interface power supply units = number of ground fault detection modules)","Note 2":"Uaux should be protected by a 2 A slow fuse. The endurance of the relay can be increased if inductive loads are connected using freewheel diodes.","Counter":"No","Lin Min":"6mA","Uin min":"10V","Addressing":"the module does not need its own AS-Interface address","Earth fault":"10% Uas-i <= Ugnd <= 90% Uas-i","description":"AS-i ground fault module IP20 S22.5, ground fault monitoring 1 input, remote reset 2 x signaling output, Relay DC-12 1 A / DC-13 500 mA (24 V) Screw terminal connection Overall width 22.5 mm No AS-i address required Only AS-Interface monitoring","During Storage":"-40 ... +85°C","lifecycle_stage":"current","During Operation":"-25 ... +70°C","Fastening Method":"standard rail mounting/wall mounting","Rated temperature":"25°C","Low Signal Lin Max":"1.5mA","protection class IP":"IP20","Design Of The Product":"ground-fault detection modules - modules with special functions","Overvoltage Detection":"No","Ground Fault Detection":"Yes","Operating cycles DC-12":"2 000 000","Rated operational voltage DC":"24 ... 48V","AS interface total current input max":"40mA","reference code according to EN 61346-2":"K","protocol is supported AS-Interface protocol":"Yes","AS interface Connection Polarity reversal protection":"built-in","Type Of Electrical Connection Of The Inputs And Outputs":"screw-type terminals"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$104.14","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/af6cb130d0dd569230fa3ecad9e3f68c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=4437&mlfb=3RK1408-8KE00-0AA2"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1408-8KE00-0AA2","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/3RK1408-8KE00-0AA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T18:22:18.095Z","lastPublished":"2026-07-20T18:22:18.095Z","indexable":true}}