{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1308-0CD00-0CP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1308-0CD00-0CP0","canonicalUrl":"https://aoctrl.com/siemens/3RK1308-0CD00-0CP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0CD00-0CP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC 3RK1308-0CD00-0CP0 fail-safe direct-on-line starter, 4 via 3DI/LC module, 24 V DC, adjustable trip class, PROFINET and PROFIBUS DP.","salesMarkdown":"## What this fail-safe starter does in a safety circuit The Siemens 3RK1308-0CD00-0CP0 is a fail-safe direct-on-line starter module that integrates three digital inputs and a load controller in a single 30 mm-wide housing. It is designed for safety-related motor starting in SIL 3 / PL e applications, with the safe state defined as the load circuit open. The module supports both PROFINET and PROFIBUS DP protocols, allowing it to slot into a safety CPU's fieldbus slice without a separate gateway. The 4-byte input and 2-byte output process data map directly to the safety program's I/O addresses. ## Trip class and current adjustment — what the range means The trip class is adjustable to OFF, 5, or 10. OFF disables the overload protection (for use with an external overload relay); class 5 suits fast-starting loads like short-cycle conveyors, while class 10 covers standard motor starts. The minimum load is 50 % of the smallest adjustable rated current, so the module cannot protect a motor drawing less than half the setpoint. The ON-delay is fixed at 35 ms, and the OFF-delay ranges from 35 to 50 ms. These timing windows are set by the safety logic, not field-adjustable on the module itself. The module mounts by plugging into a base unit on a DIN rail. It occupies 30 mm of rail width, 150 mm deep, 142 mm tall. Clearance above and below is 50 mm each for air circulation and cable bending radius. Vibration resistance is 15 mm at 6 Hz, then 2 g up to 500 Hz; shock resistance is 6 g for 11 ms.","metaTitle":"Siemens 3RK1308-0CD00-0CP0 Fail-Safe Direct-On-Line Starter","metaDescription":"Siemens 3RK1308-0CD00-0CP0 fail-safe direct-on-line starter module. 4 via 3DI/LC, adjustable trip class (OFF/5/10), PROFINET & PROFIBUS DP.","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":"2 200 000","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 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","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":"Direct-on-line starter","Overvoltage Category":"III","PROFIBUS DP protocol":"Yes","Vibration Resistance":"15 mm to 6 Hz; 2g to 500 Hz","at 230 V rated value":"1 hp","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":"9 A","at 50 °C rated value":"9 A","at 55 °C rated value":"9 A","at 60 °C rated value":"9 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","at 110/120 V rated value":"0.33 hp","at 200/208 V rated value":"2 hp","at 220/230 V rated value":"2 hp","at 460/480 V rated value":"5 hp","according to IEC 60947-4-2":"AC-53a: 9 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":"90 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":"9 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":"9 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":"2.8 ... 9 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$234.95 – $668.00","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=624388&mlfb=3RK1308-0CD00-0CP0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0CD00-0CP0/alternatives.json"},"ai":{"faq":[{"question":"What is the adjustment range of Siemens 3RK1308-0CD00-0CP0?","answer":"The trip class is adjustable to OFF, 5, or 10. The minimum load is 50 % of the smallest adjustable rated current, meaning the module cannot protect a motor drawing less than half the setpoint."},{"question":"How to connect a 3DI/LC module to the Siemens 3RK1308-0CD00-0CP0?","answer":"The module plugs into a base unit on a DIN rail. It integrates three digital inputs and a load controller; the 4-byte input and 2-byte output process data map directly to the safety CPU's fieldbus interface via PROFINET or PROFIBUS DP."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1308-0CD00-0CP0","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/3RK1308-0CD00-0CP0 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}}