{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1304-5KS40-2AA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1304-5KS40-2AA3","canonicalUrl":"https://aoctrl.com/siemens/3RK1304-5KS40-2AA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1304-5KS40-2AA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIMATIC motor starter, 3RK1304-5KS40-2AA3, direct starter, CLASS 10, IP65, 24 V DC, PROFINET and PROFIBUS DP, 4 digital inputs, screw fixing.","salesMarkdown":"## IP65 direct starter with dual-fieldbus connectivity The Siemens 3RK1304-5KS40-2AA3 is a SIMATIC motor starter combining a direct starter (CLASS 10 trip class) with a remote I/O slice in an IP65 enclosure — rated for washdown and dusty environments on packaging lines or conveyor sections where a central cabinet isn't practical. It supports both PROFINET and PROFIBUS DP protocols, so it can drop into an existing Siemens fieldbus architecture without a gateway. The 24 V DC supply range is 20.4–28.8 V, and the unit draws power for both the electronics and the motor contactor coil from the same rail. ## 4 digital inputs, 2-byte process data, M12 connectivity The module provides 4 digital inputs via M12 sockets (sensor connection) and no digital outputs — the motor switching is handled internally by the direct starter. Process data is mapped as 2 bytes input and 2 bytes output, which keeps the fieldbus cycle lean. Rated breaking capacity at 400 V is 100 kA with a rated current of 2 A — sized for small motors (typically 0.37–0.75 kW range) where the short-circuit withstand at the motor branch matters for coordination with upstream MCCBs. Power dissipation is 3.888 W whether the bypass circuit is active or not, so the thermal load inside the IP65 enclosure is predictable — no derating guesswork for sealed enclosures. ## Panel fit and environmental ratings Dimensions are 150 mm deep × 110 mm wide × 230 mm high, with screw fixing and an ISO23570 socket for the main energy infeed. Mounting position can be vertical or horizontal, which helps when fitting into tight machine frames. Shock resistance is 15g for 11 ms and vibration resistance is 2g — sufficient for direct mounting on machine frames or conveyor sections without additional vibration dampers.","metaTitle":"Siemens 3RK1304-5KS40-2AA3 SIMATIC Motor Starter, IP65","metaDescription":"Siemens 3RK1304-5KS40-2AA3 SIMATIC motor starter, direct start, CLASS 10, IP65, 24 V DC, 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":"3RK1304-5KS40-2AA3","Height":"230 mm","Trip Class":"CLASS 10","description":"ET 200pro DSE HF DOL 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":"Yes","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":"No","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":"direct 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":"$401.32","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/db1dd33d6b02294e6fdc8b823f2c3093.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=66690&mlfb=3RK1304-5KS40-2AA3"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1304-5KS40-2AA3","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/3RK1304-5KS40-2AA3 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}}