{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1304-5LS40-5AA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1304-5LS40-5AA3","canonicalUrl":"https://aoctrl.com/siemens/3RK1304-5LS40-5AA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1304-5LS40-5AA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC motor starter, reversing starter, 3RK1304-5LS40-5AA3, 12 A at 400 V AC, Trip Class 10, IP65, PROFINET/PROFIBUS DP.","salesMarkdown":"## SIMATIC reversing motor starter for distributed control The Siemens SIMATIC 3RK1304-5LS40-5AA3 is a reversing motor starter, meaning it can start a motor in either direction — forward or reverse — without an external contactor pair. It mounts via screw fixing in either vertical or horizontal orientation, giving flexibility for cabinet layout. Communication is handled through PROFINET and PROFIBUS DP protocols, so it integrates directly into Siemens automation architectures without a separate gateway. The supply voltage is 24 V DC nominal (20.4 to 28.8 V range), which powers the control electronics and the integrated bypass circuit that dissipates 3.888 W when active. The breaking capacity at 400 V is listed at 100,000 A. For a panel builder, that simplifies coordination and saves a fuse holder. The unit has 2 bytes of digital inputs and 2 bytes of digital outputs. The number of physical digital inputs is 0 and the connector for digital input signals is an M12 socket. The vibration resistance is 2g and shock resistance is 15g for 11 ms. These are typical for industrial cabinet-mounted gear — no special derating needed for most factory-floor environments, but the shock spec means it can handle occasional impacts during conveyor or press operations.","metaTitle":"Siemens 3RK1304-5LS40-5AA3 SIMATIC Motor Starter, Reversing,","metaDescription":"Siemens SIMATIC 3RK1304-5LS40-5AA3 reversing motor starter. Rated 12 A at 400 V AC, Trip Class 10, IP65. PROFINET and PROFIBUS DP. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"150 mm","Width":"110 mm","at DC":"24 ... 24 V","Height":"230 mm","Trip Class":"CLASS 10","Direct Start":"No","Of The Inputs":"2 byte","During Storage":"-40 ... +70 °C","Of The Outputs":"2 byte","Type Of Voltage":"AC","lifecycle_stage":"current","During Operation":"-25 ... +55 °C","During Transport":"-40 ... +70 °C","Fastening Method":"screw fixing","Reverse Starting":"Yes","Shock Resistance":"15g / 11 ms","Mounting Position":"vertical, horizontal","PROFINET protocol":"Yes","at DC rated value":"20.4 ... 28.8 V","Product Brand Name":"SIMATIC","Type Of Assignment":"1","Degree Of Pollution":"3","Maximum Permissible":"28.8 V","Minimum Permissible":"20.4 V","Product Designation":"Motor starters","With Bypass Circuit":"3.888 W","protection class IP":"IP65","PROFIBUS DP protocol":"Yes","Vibration Resistance":"2g","at 400 V rated value":"100 000 A","Design Of The Product":"reversing starter","For Main Energy Infeed":"socket according to ISO23570","Without Bypass Circuit":"3.888 W","supply voltage 1 at DC":"24 ... 24 V","Number Of Digital Inputs":"0","For Digital Input Signals":"0","For Digital Output Signals":"0","at AC at 400 V rated value":"12 A","brake control with 24 V DC":"No","1 For Digital Input Signals":"M12 socket","2 For Digital Input Signals":"M12 socket","3 For Digital Input Signals":"M12 socket","4 For Digital Input Signals":"M12 socket","brake control with 180 V DC":"No","brake control with 230 V AC":"No","brake control with 400 V AC":"Yes","brake control with 500 V DC":"No","For Main Energy Transmission":"socket according to ISO23570","For Supply Voltage Line-Side":"via backplane bus","Type Of The Motor Protection":"solid-state","at AC-3 at 400 V rated value":"5 500 W","For Load-Side Outgoing Feeder":"socket according to ISO23570","Operating Voltage Rated Value":"200 ... 400 V","Substance Prohibitance (Date)":"05/01/2012","supports PROFIenergy shutdown":"Yes","Digital Inputs Parameterizable":"No","Insulation Voltage Rated Value":"400 V","Design Of The Switching Contact":"electromechanical","Digital Outputs Parameterizable":"No","For Supply Voltage Transmission":"via backplane bus","Design Of Short-Circuit Protection":"fuse","Product Function Bus Communication":"Yes","Product Function On-Site Operation":"Yes","Relative Humidity During Operation":"5 ... 95 %","Product Component Motor Brake Output":"Yes","Surge Voltage Resistance Rated Value":"6 kV","supports PROFIenergy measured values":"Yes","Type Of Voltage Of The Supply Voltage":"DC","reference code according to IEC 81346-2":"Q","Number Of Poles For Main Current Circuit":"3","control supply voltage at DC rated value":"20.4 ... 28.8 V","Product Function Short Circuit Protection":"Yes","Supply Voltage For Brake Control Required":"400 V","Touch Protection Against Electrical Shock":"finger-safe","design of the interface PROFINET protocol":"Yes","with low demand rate according to SN 31920":"100 FIT","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"75 %","At The Manufacturer-Specific Device Interface":"optical interface","Type Of Voltage Of The Control Supply Voltage":"DC","Type Of Electrical Connection For Main Current Circuit":"tab terminals","Installation Altitude At Height Above Sea Level Maximum":"3 500 m","Type Of Electrical Connection Of The Communication Interface":"via backplane bus","Type Of Voltage Of The Supply Voltage For Brake Control Required":"AC","operating range relative to the operating voltage at AC at 50 Hz":"200 ... 440 V","operating voltage at AC at 60 Hz according to CSA and UL rated value":"600 V","Mechanical Service Life (Operating Cycles) Of The Main Contacts Typical":"30 000 000","Maximum Permissible Voltage For Safe Isolation Between Main And Auxiliary Circuit":"400 V","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"1.5 ... 12 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=494606&mlfb=3RK1304-5LS40-5AA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1304-5LS40-5AA3/alternatives.json"},"ai":{"faq":[{"question":"Does this unit support PROFINET or PROFIBUS?","answer":"Yes, it supports both PROFINET and PROFIBUS DP protocols, allowing direct integration into Siemens automation networks."},{"question":"What is the physical size of the 3RK1304-5LS40-5AA3?","answer":"It measures 230 mm high, 110 mm wide, and 150 mm deep. It uses screw fixing and can be mounted vertically or horizontally."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1304-5LS40-5AA3","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/3RK1304-5LS40-5AA3 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}}