{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1308-0DB00-0CP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1308-0DB00-0CP0","canonicalUrl":"https://aoctrl.com/siemens/3RK1308-0DB00-0CP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0DB00-0CP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC fail-safe reversing starter, 4 via 3DI/LC module, 55 kA at 400 V, adjustable trip class, PROFINET and PROFIBUS DP, 30 x 150 x 142 mm.","salesMarkdown":"The Siemens SIMATIC 3RK1308-0DB00-0CP0 is a fail-safe reversing starter — a single device that combines a reversing contactor pair with a safety monitoring function, so it both controls motor direction and drops the load circuit open when a safety demand is asserted. It is a current-production part (lifecycle stage: current). The headline number for sourcing fit is the 55 kA short-circuit current rating at 400 V and 500 V. That means this starter can be installed on a line-side fault current up to 55 kA without needing an upstream current-limiting device — a real panel-space and coordination saver in high-fault installations. The adjustable trip class (OFF / 5 / 10) lets you tune the overload curve to the motor's thermal capacity: Class 10 for standard induction motors, Class 5 for submersible or high-inertia loads that need a faster trip, or OFF for use with an external overload relay. It is a 4 via 3DI/LC module, meaning it integrates four safety-related digital inputs and a load circuit interface into one 30 mm wide DIN-rail housing. The 30 mm width is tight for a reversing starter with integrated safety — a conventional contactor pair plus separate safety relay would take 45–60 mm of DIN rail. Mounts vertically or horizontally on a DIN rail via a pluggable BaseUnit. Horizontal mounting requires derating per the manual — so for a panel build, plan for vertical orientation to keep the full 55 kA SCCR and rated current. PROFINET and PROFIBUS DP onboard — no separate gateway module needed. The safety communication runs over PROFIsafe via the same bus cable, which keeps the safety CPU separation clean: the fail-safe logic lives in the starter, not in a separate safety relay on the DIN rail. For a molding cell with barrel-zone heat radiating into the cabinet, that 60 °C ceiling is tight — plan for forced ventilation or a filtered fan if the enclosure ambient exceeds 50 °C. B10d value of 10,100,000 cycles — that is the number of operations before 10% of the population has a dangerous failure. For a reversing starter cycling a conveyor or mixer every 30 seconds, that works out to roughly 9.6 years of continuous 24/7 operation before the B10d is reached. The safe state is load circuit open, so a fault or safety demand drops the motor contactor open. ON-delay time is 35 ms, OFF-delay is 35 to 50 ms. That 35 ms off-delay means the safety response is fast enough for most guarding applications (light curtains, interlock switches) without nuisance trips from brief power dips. Shock resistance rated at 6g / 11 ms and vibration resistance to 15 mm at 6 Hz, 2g to 500 Hz — this is a machine-mount part, not a control-room module. It can live on a vibrating press or conveyor frame. This is a current-production part — no end-of-life notice on record. The 24 V DC control supply accepts 20.4 to 28.8 V — a standard 24 V industrial bus, no special power supply needed.","metaTitle":"Siemens SIMATIC 3RK1308-0DB00-0CP0 Fail-Safe Reversing Start","metaDescription":"Siemens SIMATIC 3RK1308-0DB00-0CP0 fail-safe reversing starter. 55 kA SCCR at 400 V, adjustable trip class, PROFINET/PROFIBUS DP. Currently in production. Sourced to order against","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Note":"4 via 3DI/LC module","Depth":"150 mm","Width":"30 mm","Height":"142 mm","Upwards":"50 mm","Downwards":"50 mm","B10d value":"10 100 000","Safe State":"Load circuit open","Trip Class":"CLASS OFF / 5 / 10 adjustable","Direct Start":"Yes","ON-delay time":"35 ms","Of The Inputs":"4 byte","During Storage":"-40 ... +70 °C","OFF-delay time":"35 ... 50 ms","Of The Outputs":"2 byte","Safety-Related":"1","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":"Fail-safe reversing starter","Reverse Starting":"Yes","Shock Resistance":"6g / 11 ms","Mounting Position":"Vertical, horizontal (observe derating)","On-Site Operation":"Yes","PROFINET protocol":"Yes","at DC rated value":"24 V","Product Brand Name":"SIMATIC","Type Of Assignment":"1","Degree Of Pollution":"2","Maximum Permissible":"28.8 V","Minimum Permissible":"20.4 V","Product Designation":"Reversing 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","for signal <1> at DC":"15 ... 30","at 40 °C rated value":"1 A","at 50 °C rated value":"1 A","at 55 °C rated value":"1 A","at 60 °C rated value":"1 A","with signal <0> at DC":"0 ... 5 V","For Main Energy Infeed":"Plug contact to Base Unit","Remote Firmware Update":"Yes","At Switching On Of Motor":"250 mA","Number Of Digital Inputs":"5","according to IEC 60947-4-2":"AC-53a: 1 A: (8-0,7: 70-32)","1 For Digital Input Signals":"Pluggable module - accessory","2 For Digital Input Signals":"Plug contact to Base Unit","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":"95 mA","Type Of Input Characteristic":"Type 1 in accordance with EN 61131-2","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":"10 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","category according to EN ISO 13849-1":"4","supports PROFIenergy measured values":"Yes","EMC immunity according to IEC 60947-1":"Class A","Type Of Voltage Of The Supply Voltage":"DC","stop category according to EN 60204-1":"0","due to burst according to IEC 61000-4-4":"3 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":"3.8 W","PFH according to IEC 61508 relating to SIL":"3.6E-9 1/h","at 500 V according to UL 60947 rated value":"100 kA","in switching state OFF with bypass circuit":"2.3 W","protocol is supported AS-Interface protocol":"No","safety device type according to IEC 61508-2":"Type B","For Power Supply Reverse Polarity Protection":"Yes","When Switched Off Via Control Inputs Maximum":"55 ms","When Switched Off Via Supply Voltage Maximum":"120 ms","equipment variant according to IEC 60947-4-2":"3","operational current at AC at 400 V rated value":"1 A","hardware fault tolerance according to IEC 61508":"1","EMC emitted interference according to IEC 60947-1":"class A","PFDavg with low demand rate according to IEC 61508":"4.1E-7","electrostatic discharge according to IEC 61000-4-2":"8 kV air discharge","performance level (PL) according to EN ISO 13849-1":"e","Input Current At Digital Input For Signal <1> Typical":"0.009 A","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","Diagnostics Test Interval By Internal Test Function Maximum":"600 s","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":"1 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":"0.3 ... 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$279.40","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=624389&mlfb=3RK1308-0DB00-0CP0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0DB00-0CP0/alternatives.json"},"ai":{"faq":[{"question":"What is the 4 via 3DI/LC module designation on this starter?","answer":"The 4 via 3DI/LC module means the starter integrates four safety-related digital inputs and a load circuit interface into one unit. This eliminates the need for a separate safety relay module for basic guarding functions."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1308-0DB00-0CP0","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/3RK1308-0DB00-0CP0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}