{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1303-5CS41-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1303-5CS41-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RK1303-5CS41-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1303-5CS41-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK1303 reversing starter, order code 3RK1303-5CS41-1AA0, 9 A at AC-3 400 V, IP65, PROFIBUS DP, 24 V DC control supply.","salesMarkdown":"The Siemens 3RK1303-5CS41-1AA0 is a reversing starter — a compact, pre-assembled unit that combines two contactors, a solid-state motor protection function, and the interlocking logic for forward/reverse control of a three-phase motor. It is part of the SIRIUS 3RK1303 family, designed for distributed motor control in industrial automation. Its headline motor rating is 9 A in AC-3 duty at 400 V, which means it can switch a standard three-phase induction motor drawing up to that current — roughly a 4 kW motor at 400 V — under the starting and stopping conditions typical of a conveyor, pump, or fan. The unit is rated for an operating voltage of 400 to 500 V AC, and its short-circuit withstand at 400 V is 100 kA, so it can be installed on a bus with high fault current without requiring an upstream current-limiting device. Control power is 24 V DC nominal, with a permissible range of 20.4 to 28.8 V DC, which covers the standard 24 V industrial supply including the ripple and drop typical of a long cable run. ## Integration and connectivity This reversing starter communicates over PROFIBUS DP, so it drops into a Siemens S7 or any other PROFIBUS master network as a remote I/O and motor control node. It does not support PROFINET natively. The unit has two parameterizable digital inputs, each on an M12 socket, for local start/stop or selector switch signals. There are no digital outputs on this variant. The line-side supply connection uses a hybrid plug, and the load-side outgoing feeder uses a socket conforming to ISO 23570. The main energy infeed also uses an ISO 23570 socket. The communication interface uses a hybrid plug and socket arrangement. ## Protection and reliability Motor protection is solid-state, which provides accurate thermal overload protection without the drift of a bimetal relay. The switching contact is mechanical, so the main power path is a conventional contactor set. Short-circuit protection is provided by fuses, and the unit itself has short-circuit protection built in. The minimum operating frequency is 1 cycle per hour, which is typical for a reversing starter not intended for high-speed jogging or plugging duty. The substance prohibitance date of 05/01/2012 indicates compliance with RoHS and similar substance restrictions as of that date. Standard compliance documentation (RoHS, REACH) is available from the manufacturer.","metaTitle":"Siemens 3RK1303-5CS41-1AA0 Reversing Starter, 9 A AC-3, IP65","metaDescription":"Siemens 3RK1303-5CS41-1AA0 reversing starter, rated 9 A at AC-3 400 V, IP65, PROFIBUS DP, 24 V DC coil, current production status. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Depth":"107 mm","Width":"130 mm","at DC":"24 ... 24 V","Height":"250 mm","Type Of Voltage":"DC","lifecycle_stage":"current","Bus Communication":"Yes","PROFINET protocol":"No","at DC rated value":"20.4 ... 28.8 V","Type Of Assignment":"1","Maximum Permissible":"28.8 V","Minimum Permissible":"20.4 V","protection class IP":"IP65","PROFIBUS DP protocol":"Yes","at 400 V rated value":"100 kA","Design Of The Product":"reversing starter","Of Auxiliary Contacts":"< 1 error per 100 million operating cycles","For Main Energy Infeed":"socket according to ISO23570","supply voltage 1 at DC":"24 ... 24 V","Number Of Digital Inputs":"2","Short Circuit Protection":"Yes","For Digital Input Signals":"2","For Digital Output Signals":"0","1 For Digital Input Signals":"M12 socket","2 For Digital Input Signals":"M12 socket","Operating Frequency Minimum":"1 1/h","brake control with 400 V AC":"No","For Supply Voltage Line-Side":"hybrid plug","Type Of The Motor Protection":"solid-state","at AC-3 at 400 V rated value":"9 A","For Load-Side Outgoing Feeder":"socket according to ISO23570","Operating Voltage Rated Value":"400 ... 500 V","Substance Prohibitance (Date)":"05/01/2012","Digital Inputs Parameterizable":"Yes","For Communication Transmission":"hybrid socket","Of The Communication Interface":"hybrid plug","Design Of The Switching Contact":"mechanical","Digital Outputs Parameterizable":"No","For Supply Voltage Transmission":"hybrid socket","Design Of Short-Circuit Protection":"fuse","Ambient Temperature During Operation":"-20 ... +40 °C","Product Component Motor Brake Output":"No","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","design of the interface PROFINET protocol":"No","with low demand rate according to SN 31920":"50 %","protocol is supported AS-Interface protocol":"No","with high demand rate according to SN 31920":"75 %","operating power at AC-3 at 400 V rated value":"4 000 W","At The Manufacturer-Specific Device Interface":"M12 socket","Type Of Voltage Of The Control Supply Voltage":"DC","Type Of Electrical Connection For Main Current Circuit":"tab terminals","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"2.4 ... 9 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=282643&mlfb=3RK1303-5CS41-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1303-5CS41-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What fieldbus protocol does the 3RK1303-5CS41-1AA0 support?","answer":"PROFIBUS DP. It does not have native PROFINET support."},{"question":"What compliance documentation is available for the 3RK1303-5CS41-1AA0?","answer":"The unit has a substance prohibitance date of 05/01/2012, indicating RoHS compliance. Standard manufacturer declarations for RoHS and REACH are available."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1303-5CS41-1AA0","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/3RK1303-5CS41-1AA0 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}}