{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1308-0CB00-0CP0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1308-0CB00-0CP0","canonicalUrl":"https://aoctrl.com/siemens/3RK1308-0CB00-0CP0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0CB00-0CP0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC 3RK1308-0CB00-0CP0, fail-safe direct-on-line motor starter, 4 via 3DI/LC module, 55 kA SCCR at 400 V, adjustable Trip Class OFF/5/10, PROFINET and PROFIBUS DP.","salesMarkdown":"## Fail-safe DOL starter with integrated safety logic The Siemens 3RK1308-0CB00-0CP0 is a SIMATIC fail-safe direct-on-line starter built around a 4 via 3DI/LC module — four inputs routed through three digital inputs plus a load-current monitoring channel. It is a single unit that combines a contactor, overload relay, and safety isolation in one 30 mm wide housing that plugs into a base unit. The SCCR matches what you see on larger motor control centers, so it slots into existing coordination studies without rework. Trip Class is adjustable OFF / 5 / 10, letting you match the thermal curve to the motor's start profile. For high-inertia loads like fans or centrifuges, set Class 10; for frequent starts on conveyors, Class 5 keeps the reset time short. Class OFF disables the electronic overload for applications with separate protection. ## Safety function and response times The safe state is load circuit open — the starter drops power to the motor when a safety demand is triggered. ON-delay is fixed at 35 ms; OFF-delay is adjustable 35 to 50 ms, which lets you tune the response for different risk assessments without adding external timer relays. B10d value of 10,100,000 cycles. Safety-related channel count is 1. ## Fieldbus and I/O mapping Dual-protocol onboard — PROFINET and PROFIBUS DP are both supported. Input data mapped to 4 bytes, outputs to 2 bytes. Power supply tolerance is 24 V DC nominal, with a permissible range of 20.4 V to 28.8 V. That covers the sag you see on a long DC bus with multiple starters pulling inrush. Pluggable into a base unit — no hardwiring of the power section. The module itself is 30 mm wide, 142 mm high, 150 mm deep. Mount vertically or horizontally, but if you go horizontal you need to derate per the manual. Vibration resistance is 2g up to 500 Hz; shock resistance is 6g for 11 ms, which covers most conveyor and pump applications. Minimum load is 50% of smallest adjustable rated current.","metaTitle":"Siemens 3RK1308-0CB00-0CP0 SIMATIC Fail-Safe DOL Starter, 55","metaDescription":"Siemens 3RK1308-0CB00-0CP0 SIMATIC fail-safe direct-on-line starter. 4 via 3DI/LC module, 55 kA SCCR at 400 V, adjustable Trip Class. Active production. Quoted to order against RFQ","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 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 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":"$215.90","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=624386&mlfb=3RK1308-0CB00-0CP0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1308-0CB00-0CP0/alternatives.json"},"ai":{"faq":[{"question":"What is the 4 via 3DI/LC module on this starter?","answer":"It means the module has four input channels routed through three digital inputs plus one load-current monitoring channel. The load-current channel measures motor current for overload protection and diagnostics."},{"question":"What trip classes are available on 3RK1308-0CB00-0CP0?","answer":"Adjustable OFF / 5 / 10. Class 5 for fast tripping on low-inertia loads, Class 10 for standard motors, and OFF to disable the electronic overload when separate protection is used."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1308-0CB00-0CP0","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/3RK1308-0CB00-0CP0 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}}