{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1908-0AP00-0CH0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1908-0AP00-0CH0","canonicalUrl":"https://aoctrl.com/siemens/3RK1908-0AP00-0CH0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1908-0AP00-0CH0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC 3RK1908-0AP00-0CH0 BaseUnit, for AC feed in, 24 V DC, 7 A, push-in spring-loaded terminals, 75 x 30 x 215 mm.","salesMarkdown":"## BaseUnit for AC feed in — what it carries The 3RK1908-0AP00-0CH0: This is a SIMATIC BaseUnit (product designation BaseUnit) designed specifically for AC feed in — it distributes the AC supply voltage to the I/O modules mounted above it on the standard DIN rail. The supply voltage is 24 V DC, rated 20.4 V minimum to 28.8 V maximum, so it matches the standard 24 V DC control supply found in every Siemens panel. The screwdriver tip needed is a standard slot 0.6 mm x 3.5 mm — no special tooling required for field termination. Ampacity maximum is 7 A across the bus; the rated operating voltage and insulation voltage are both 500 V, with 500 V isolation between main and auxiliary circuits. Surge voltage resistance is 6 kV, which puts this BaseUnit in the pollution degree 2 environment — typical for clean, climate-controlled industrial panels. Mounting position can be vertical or horizontal; the fastening method is standard rail (DIN rail). Relative humidity during operation is 10 to 95 %, and air pressure range is 900 to 1060 hPa per SN 31205. Vibration resistance is 15 mm at 6 Hz and 2g up to 500 Hz; shock resistance is 6g for 11 ms — this BaseUnit holds up in machinery with moderate vibration profiles. Clearance required above and below the unit is 50 mm each way for airflow and wiring access — factor this into the panel layout. The IEC 81346-2 reference code is Q, which designates it as a switching device in the equipment function classification. ## Lifecycle and compliance status Substance prohibitance date is 04/15/2016, which aligns with the RoHS compliance cutoff — the BaseUnit meets the RoHS substance restrictions effective from that date. No additional compliance documentation (UL, CSA, CE) is listed in the spec record, so confirm jurisdiction-specific approvals with the factory if required for your panel certification.","metaTitle":"Siemens 3RK1908-0AP00-0CH0 BaseUnit, 24 V DC, 7 A, Push-in","metaDescription":"Siemens SIMATIC 3RK1908-0AP00-0CH0 BaseUnit for AC feed in. 24 V DC supply, 7 A ampacity, push-in terminals. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"75 mm","Solid":"1x 0,5 ... 2,5 mm²","Width":"30 mm","title":"3RK1908-0AP00-0CH0","Height":"215 mm","Upwards":"50 mm","Downwards":"50 mm","description":"Base unit for ET 200SP motor starter for use in the ET 200SP HA system with infeed 500 V including infeed bus cover","During Storage":"-40 ... +70 °C","lifecycle_stage":"current","Ampacity Maximum":"7 A","During Operation":"-25 ... +60 °C; For derating see manual","During Transport":"-40 ... +70 °C","Fastening Method":"standard rail","Product Category":"Accessories","Shock Resistance":"6g / 11 ms","Mounting Position":"vertical, horizontal","Product Brand Name":"SIMATIC","Degree Of Pollution":"2","Maximum Permissible":"28.8 V","Minimum Permissible":"20.4 V","Product Designation":"BaseUnit","Vibration Resistance":"15 mm to 6 Hz; 2g to 500 Hz","Design Of The Product":"For AC feed in","For Main Current Circuit":"spring-loaded terminals (push-in)","Number Of Digital Inputs":"0","at AWG cables for supply":"1x 18 ... 10","Size Of The Screwdriver Tip":"Standard screwdriver 0.6 mm x 3.5 mm","Type Of Connecting Terminal":"Push-in terminal","Shape Of The Screwdriver Tip":"Slot","Operating Voltage Rated Value":"500 V","Substance Prohibitance (Date)":"04/15/2016","Insulation Voltage Rated Value":"500 V","operating voltage of AC supply":"500 V","For Auxiliary And Control Circuit":"spring-loaded terminals (push-in)","Between Main And Auxiliary Circuit":"500 V","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"900 ... 1 060 hPa","supply voltage 1 at DC rated value":"24 V","Surge Voltage Resistance Rated Value":"6 kV","Type Of Voltage Of The Supply Voltage":"DC","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"1x 0,5 ... 2,5 mm²","Number Of Poles For Main Current Circuit":"3","Type Of Voltage Of The Operating Voltage":"AC","Finely Stranded Without Core End Processing":"1x 0,5 ... 2,5 mm²","operational current at AC at 400 V rated value":"32 A; Derating, see Manual","Installation Altitude At Height Above Sea Level Maximum":"4 000 m; For derating see manual","type of connectable conductor cross-sections at AWG cables for load-side outgoing feeder":"1x 20 ... 12"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2506c84bc50fd54eb200b0e325c9c833.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1389531&mlfb=3RK1908-0AP00-0CH0"},"ai":{"faq":[{"question":"What terminal type does 3RK1908-0AP00-0CH0 use?","answer":"Both the main current circuit and the auxiliary/control circuit use push-in spring-loaded terminals (push-in terminal type). A standard slot screwdriver 0.6 mm x 3.5 mm is needed for release."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1908-0AP00-0CH0","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/3RK1908-0AP00-0CH0 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}}