{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1908-1AA00-0BP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1908-1AA00-0BP0","canonicalUrl":"https://aoctrl.com/siemens/3RK1908-1AA00-0BP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1908-1AA00-0BP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC 3DI/LC control module, 3RK1908-1AA00-0BP0, 4 digital inputs, inputs 1-3 parameterizable, input 4 for local control, plugs onto motor starters, IP20.","salesMarkdown":"The Siemens 3RK1908-1AA00-0BP0 is a SIMATIC 3DI/LC control module — a 4-channel digital input accessory that plugs directly onto motor starters in the 3RK1 family. Inputs 1 through 3 are parameterizable for flexible signal mapping; input 4 is dedicated to local control (LC), typically wired to a local pushbutton or selector switch for manual override at the motor. Four digital inputs, Type 1 per IEC 61131, so they accept standard 24 VDC sensor signals from proximity switches, limit switches, or pushbuttons. Input current at signal <1> is typically 9 mA — light enough on the sensor supply, which is rated for 0.1 A maximum at 60 °C. That 0.1 A limit means you can power one or two small sensors from the module's own supply, but for a bank of photoelectric eyes you'll want an external 24 VDC supply. The module detects short circuits on the sensor wiring and reports a diagnostic — a useful check when a cable gets pinched in a panel or crushed under a cable tray. Input filtering is fixed: signal transition times run 10 to 15 ms for both <0> to <1> and <1> to <0> at rated input voltage. That's typical for a motor-starter-mounted DI module — fast enough for interlocking and run-permissive signals, but not for high-speed counting or encoder pulses. If you need sub-millisecond response, this isn't the right module. This module is designed to snap onto a motor starter — no DIN rail required, no separate enclosure mount. It occupies 30 mm width, 54.5 mm height, and 42.3 mm depth, so it adds minimal footprint to the starter assembly. Mounting position is flexible: vertical, horizontal, or flat, which helps when the panel layout is tight or the starter is oriented oddly. IP20 protection means it's for inside a cabinet only — no washdown, no dust-laden environment without an enclosure. Wire termination accepts 0.2 to 1.5 mm² solid or stranded, or 0.25 to 1.5 mm² finely stranded with ferrule. Use a standard 0.6 mm x 3.5 mm slotted screwdriver. Sensor cable runs up to 30 m — fine for local sensors on the same machine frame; beyond that, watch for voltage drop and noise pickup. The module is rated for operating temperatures from -25 to +60 °C, storage/transport from -40 to +70 °C, and 10 to 95 % relative humidity (non-condensing). Shock resistance is 6g for 11 ms; vibration resistance is 15 mm at 6 Hz, then 2g up to 500 Hz — typical for industrial machinery mounted on a panel or subframe.","metaTitle":"Siemens 3RK1908-1AA00-0BP0 SIMATIC 3DI/LC Control Module, 4","metaDescription":"Siemens 3RK1908-1AA00-0BP0 SIMATIC 3DI/LC control module. 4 digital inputs, inputs 1-3 parameterizable, input 4 for local control. Plugs onto motor starters. Current lifecycle stag","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Note":"Inputs 1-3 parameterizable; input 4 (LC) for local control","Depth":"42.3 mm","Width":"30 mm","title":"3RK1908-1AA00-0BP0","Height":"54.5 mm","description":"3DI/LC module (connection terminals) for ET 200SP motor starter","During Storage":"-40 ... +70 °C","lifecycle_stage":"current","During Operation":"-25 ... +60 °C","During Transport":"-40 ... +70 °C","Fastening Method":"Can be plugged onto motor starters","Product Category":"Accessories","Product Function":"Accessories","Shock Resistance":"6g / 11 ms","Mounting Position":"vertical, horizontal, flat","Solid Or Stranded":"0.2 ... 1.5 mm²","Product Brand Name":"SIMATIC","Degree Of Pollution":"2","Product Designation":"3DI/LC control module","protection class IP":"IP20","Vibration Resistance":"15 mm to 6 Hz; 2g to 500 Hz","Design Of The Product":"Accessories","Number Of Digital Inputs":"4","Size Of The Screwdriver Tip":"Standard screwdriver 0.6 mm x 3.5 mm","Shape Of The Screwdriver Tip":"Slot","Substance Prohibitance (Date)":"04/15/2016","Wire Length Of Sensor Maximum":"30 m","Digital Inputs Parameterizable":"Yes","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"900 ... 1 060 hPa","Finely Stranded With Core End Processing":"0.25 ... 1.5 mm²","Output Voltage For Sensor Supply Minimum":"19.2 V","Type Of Output Voltage For Sensor Supply":"DC","Product Function Short Circuit Protection":"Yes","Finely Stranded Without Core End Processing":"0.2 ... 1.5 mm²","Diagnostics Function Short-Circuit Detection":"Yes","For Signal <0> To <1> At Rated Input Voltage":"10 ... 15 ms","For Signal <1> To <0> At Rated Input Voltage":"10 ... 15 ms","digital input version type 1 acc. to IEC 61131":"Yes","output current for sensor supply at 60 °C maximum":"0.1 A","Input Current At Digital Input For Signal <1> Typical":"9 mA","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Type Of Electrical Connection For Auxiliary And Control Circuit":"spring-loaded terminals (push-in)","product function with 24 V sensor supply short-circuit protection":"Yes","Value Range Of The Input Voltage At Digital Input For Signal <0> Detection":"-30 ... +5 V","Value Range Of The Input Voltage At Digital Input For Signal <1> Detection":"+15 ... +30 V","AWG number as coded connectable conductor cross section for auxiliary contacts":"24 ... 16","At The Standard Inputs At Rated Input Voltage Parameterizable Input Delay Time":"No","display version for diagnostic function: Status display transmission channel channel status LED":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$44.45","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=567111&mlfb=3RK1908-1AA00-0BP0"},"ai":{"faq":[{"question":"What does the 'LC' input (input 4) do?","answer":"Input 4 is dedicated to local control, typically wired to a local pushbutton or selector switch for manual override at the motor starter."},{"question":"What is the physical size of this module?","answer":"Width 30 mm, height 54.5 mm, depth 42.3 mm. It plugs directly onto a motor starter, so no DIN rail is needed."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1908-1AA00-0BP0","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/3RK1908-1AA00-0BP0 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}}