{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1308-0AA00-0CP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1308-0AA00-0CP0","canonicalUrl":"https://aoctrl.com/siemens/3RK1308-0AA00-0CP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0AA00-0CP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC 3RK1308-0AA00-0CP0 direct-on-line motor starter, 0.4 A rated current at 40 °C, 55 kA short-circuit breaking capacity at 400 V, PROFINET and PROFIBUS DP, 150 x 30 x 142 mm.","salesMarkdown":"## SIMATIC motor starter with PROFINET — 0.4 A, 55 kA SCCR The Siemens 3RK1308-0AA00-0CP0 is a SIMATIC-branded direct-on-line motor starter combining a contactor, overload relay, and fieldbus interface in a single 30 mm-wide housing that plugs into a BaseUnit on the DIN rail. Rated 0.4 A at both 40 °C and 50 °C ambient — the minimum load is 50 % of the smallest adjustable rated current, so it is sized for fractional-horsepower motors in conveyor, pump, or fan duty where the line current stays under half an amp. ## Fieldbus and I/O — PROFINET and PROFIBUS DP, 4 input / 2 output bytes Supports both PROFINET and PROFIBUS DP protocols, so it fits into Siemens S7-1500 or S7-1200 controller environments as well as legacy PROFIBUS networks without a gateway. The module maps 4 bytes of input data and 2 bytes of output data — the note '4 via 3DI/LC module' indicates four digital inputs are routed through the load circuit monitoring, giving the PLC direct feedback on the motor current and contactor state. ON-delay is fixed at 20 ms;. ## Trip class and protection — adjustable CLASS OFF / 5 / 10, safe state open Trip class is selectable between OFF (no overload protection), CLASS 5, and CLASS 10 — CLASS 10 is the standard for standard-duty motor starting where the acceleration time is under 10 seconds; CLASS 5 is for fast-starting loads like small pumps that reach speed in under 5 seconds. The safe state is 'load circuit open' — on a fault or loss of communication, the output contacts open and the motor coasts to a stop, which is the expected fail-safe behavior for a direct-on-line starter in a safety-related control system. Supply voltage range is 20.4 to 28.8 V, compatible with standard 24 VDC control rails; overvoltage category III means it can be connected directly to the panel's distribution bus without additional surge suppression. ## Panel fit and environment — 30 mm wide, -25 to +60 °C, vibration 2g Dimensions are 150 mm depth, 30 mm width, 142 mm height — the 30 mm width is the same as a single Siemens SIRIUS 3RT2 contactor, so it occupies one standard slot on the mounting rail and leaves room for adjacent modules in a dense panel layout. Vibration resistance is 15 mm amplitude at 6 Hz and 2g up to 500 Hz; shock resistance is 6g for 11 ms — this qualifies the starter for machine-mounted applications on conveyors, packaging lines, or compressor skids where the panel is subject to continuous vibration. ## Sourcing and lifecycle — current production, quoted to order The MTBF is 48 a (years), which is the reliability figure for the electronic assembly — for a critical-spare holding decision, this means the expected failure rate is roughly 2 % per year in continuous operation at rated conditions.","metaTitle":"Siemens 3RK1308-0AA00-0CP0 SIMATIC motor starter, 0.4 A","metaDescription":"Siemens 3RK1308-0AA00-0CP0 SIMATIC direct-on-line motor starter, 0.4 A at 40 °C, 55 kA SCCR, PROFINET/PROFIBUS DP, MTBF 48 a.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"MTBF":"48 a","Note":"4 via 3DI/LC module","Depth":"150 mm","Width":"30 mm","title":"3RK1308-0AA00-0CP0","Height":"142 mm","Upwards":"50 mm","Downwards":"50 mm","Safe State":"Load circuit open","Trip Class":"CLASS OFF / 5 / 10 adjustable","description":"Direct-on-line starter High Feature; Electronic switching; Electronic overload protection up to 0.09 kW / 400 V; Adjustment range 0.1.. 0.4 A; PROFIenergy; Option: 3DI/LC module","Direct Start":"Yes","ON-delay time":"20 ms","Of The Inputs":"4 byte","During Storage":"-40 ... +70 °C","OFF-delay time":"35 ... 50 ms","Of The Outputs":"2 byte","lifecycle_stage":"current","During Operation":"-25 ... +60 °C; For derating see manual","During Transport":"-40 ... +70 °C","Fastening Method":"pluggable in BaseUnit","Minimum Load [%]":"50 %; from smallest adjustable rated current","Product Category":"Motor starter","Product Function":"Direct-on-line starter","Reverse Starting":"No","Shock Resistance":"6g / 11 ms","Mounting Position":"Vertical, horizontal (observe derating)","On-Site Operation":"Yes","PROFINET protocol":"Yes","Product Brand Name":"SIMATIC","Type Of Assignment":"1","Degree Of Pollution":"2","Maximum Permissible":"28.8 V","Minimum Permissible":"20.4 V","Product Designation":"Direct-on-line starter","Overvoltage Category":"III","PROFIBUS DP protocol":"Yes","Vibration Resistance":"15 mm to 6 Hz; 2g to 500 Hz","at 400 V rated value":"55 kA","at 500 V rated value":"55 kA","at 40 °C rated value":"0.4 A","at 50 °C rated value":"0.4 A","at 55 °C rated value":"0.4 A","at 60 °C rated value":"0.4 A","For Main Energy Infeed":"Plug contact to Base Unit","Remote Firmware Update":"Yes","At Switching On Of Motor":"230 mA","Number Of Digital Inputs":"4","1 For Digital Input Signals":"Pluggable module - accessory","Intrinsic Device Protection":"Yes","Operating Frequency Maximum":"1 1/s","inrush current peak at 24 V":"25 A; Observe the manual for group configuration","For Supply Voltage Line-Side":"Plug contact to Base Unit","In Standby Mode Of Operation":"85 mA","Type Of The Motor Protection":"solid-state","For Load-Side Outgoing Feeder":"Plug contact to Base Unit","Operating Voltage Rated Value":"48 ... 500 V","Substance Prohibitance (Date)":"04/15/2016","supports PROFIenergy shutdown":"Yes","Ampacity When Starting Maximum":"4 A","Insulation Voltage Rated Value":"500 V","Design Of The Switching Contact":"Hybrid","supply voltage at DC rated value":"24 V","Operating Frequency 1 Rated Value":"50 Hz","Operating Frequency 2 Rated Value":"60 Hz","Between Main And Auxiliary Circuit":"500 V","Design Of Short-Circuit Protection":"fuse","Product Function Bus Communication":"Yes","Relative Humidity During Operation":"10 ... 95 %","air pressure according to SN 31205":"900 ... 1 060 hPa","Product Component Motor Brake Output":"No","Surge Voltage Resistance Rated Value":"6 kV","supports PROFIenergy measured values":"Yes","EMC immunity according to IEC 60947-1":"Class A","Type Of Voltage Of The Supply Voltage":"DC","due to burst according to IEC 61000-4-4":"2 kV","duration of inrush current peak at 24 V":"0.145 ms","reference code according to IEC 81346-2":"Q","Number Of Poles For Main Current Circuit":"3","Wire Length For Motor Unshielded Maximum":"200 m","Product Function Short Circuit Protection":"Yes","in switching state ON with bypass circuit":"3.4 W","at 500 V according to UL 60947 rated value":"100 kA","in switching state OFF with bypass circuit":"2 W","protocol is supported AS-Interface protocol":"No","For Power Supply Reverse Polarity Protection":"Yes","equipment variant according to IEC 60947-4-2":"3","operational current at AC at 400 V rated value":"0.4 A","EMC emitted interference according to IEC 60947-1":"class A","electrostatic discharge according to IEC 61000-4-2":"8 kV air discharge","Relative Negative Tolerance Of The Operating Frequency":"5 %","Relative Positive Tolerance Of The Operating Frequency":"5 %","Installation Altitude At Height Above Sea Level Maximum":"4 000 m; For derating see manual","Relative Symmetrical Tolerance Of The Operating Voltage":"10 %","conducted HF interference emissions according to CISPR11":"Class A for industrial environment","Relative Symmetrical Tolerance Of The Operating Frequency":"5 %","field-bound HF interference emission according to CISPR11":"Class A for industrial environment","Type Of Electrical Connection Of The Communication Interface":"Plug contact to Base Unit","full-load current (FLA) for 3-phase AC motor at 480 V rated value":"0.4 A","operating voltage at AC at 60 Hz according to CSA and UL rated value":"480 V","Mechanical Service Life (Operating Cycles) Of The Main Contacts Typical":"30 000 000","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.1 ... 0.4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/189e386a8155a92f882104cbbb590e5f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1385835&mlfb=3RK1308-0AA00-0CP0"},"ai":{"faq":[{"question":"What is the MTBF of 3RK1308-0AA00-0CP0?","answer":"The listed MTBF is 48 a (years), which is the reliability figure for the electronic assembly — for a critical-spare holding decision, this means the expected failure rate is roughly 2 % per year in continuous operation at rated conditions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1308-0AA00-0CP0","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/3RK1308-0AA00-0CP0 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}}