{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1304-5KS40-3AA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1304-5KS40-3AA3","canonicalUrl":"https://aoctrl.com/siemens/3RK1304-5KS40-3AA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1304-5KS40-3AA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC motor starter, reversing starter, 3RK1304-5KS40-3AA3, CLASS 10, 2 A at 400 V AC, IP65, PROFINET and PROFIBUS DP.","salesMarkdown":"## Integrator's brief — reversing motor starter with fieldbus The Siemens SIMATIC 3RK1304-5KS40-3AA3 is a reversing motor starter rated for CLASS 10 overload protection, switching 2 A at 400 V AC. It integrates both PROFINET and PROFIBUS DP protocols, so it can slot into either a SIMATIC S7-based or third-party controller network without a gateway. The unit is a reversing starter, meaning it can control a motor in both forward and reverse directions from a single device. It supports reverse starting and does not support direct start — the reversing logic is built in. The main energy infeed uses a socket per ISO 23570, which is a standardized connector for motor starters in this class. Supply voltage is 24 V DC nominal, with a permissible range of 20.4 to 28.8 V DC. The unit draws its control power from this 24 V bus; the rated operating range covers the typical 24 V industrial supply with margin for ripple and drop. ## SCCR and fault handling The rated short-circuit current at 400 V is 100 000 A. Shock resistance is 15 g for 11 ms, and vibration resistance is 2 g. These figures are typical for machine-mounted gear; the starter can live on a press or conveyor frame without additional damping. ## Mounting and I/O configuration Mounting is by screw fixing in either vertical or horizontal orientation. Dimensions are 230 mm height, 150 mm depth, and 110 mm width — a compact footprint for a reversing starter with integrated fieldbus. The enclosure is IP65, so it can be mounted in a washdown area or outdoors without a separate enclosure. The unit provides 4 digital inputs via M12 sockets, and 0 digital outputs. The input byte count is 2 bytes; the output byte count is also 2 bytes. The brake control with 24 V DC is not supported. Power dissipation is 3.888 W both with and without the bypass circuit — the bypass does not add thermal load.","metaTitle":"Siemens SIMATIC 3RK1304-5KS40-3AA3 Reversing Motor Starter,","metaDescription":"Siemens SIMATIC 3RK1304-5KS40-3AA3 reversing motor starter, CLASS 10, 2 A at 400 V AC, IP65, PROFINET & 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","title":"3RK1304-5KS40-3AA3","Height":"230 mm","Trip Class":"CLASS 10","description":"ET 200pro RSE HF Reversing starter High Feature Mechanical switching Electronic overload protection AC-3, 0.9 kW / 400 V 0.15 A...2.00 A Brake contact 400 V AC 4 DI Han Q4/2 - Han Q8/0","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":"4","For Digital Input Signals":"4","For Digital Output Signals":"0","at AC at 400 V rated value":"2 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":"900 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":"Yes","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":"0.15 ... 2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$445.77","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ede04e00c7459d5a72f3daaa5cc7d72f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=483648&mlfb=3RK1304-5KS40-3AA3"},"ai":{"faq":[{"question":"What is the short-circuit current rating of 3RK1304-5KS40-3AA3?","answer":"The rated short-circuit current at 400 V is 100 000 A. This allows installation on high-fault-capacity distribution boards without an upstream current-limiting fuse."},{"question":"What fieldbus protocols does 3RK1304-5KS40-3AA3 support?","answer":"It supports both PROFINET and PROFIBUS DP, so it can connect to SIMATIC S7 or third-party controllers without a protocol converter."},{"question":"Where can I buy 3RK1304-5KS40-3AA3?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1304-5KS40-3AA3","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/3RK1304-5KS40-3AA3 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}}