{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1303-5BS44-3AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1303-5BS44-3AA0","canonicalUrl":"https://aoctrl.com/siemens/3RK1303-5BS44-3AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1303-5BS44-3AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK1303 reversing starter, 3RK1303-5BS44-3AA0, 3 A AC-3 at 400 V, IP65, PROFIBUS DP, 4 DI, 100 kA SCCR.","salesMarkdown":"## Reversing starter with fieldbus and IP65 enclosure The 3RK1303-5BS44-3AA0 is a Siemens SIRIUS reversing starter — a compact motor control unit that handles forward/reverse switching in a single enclosure. Its 3 A rating at 400 V AC-3 duty means it's sized for small reversing motor loads like conveyor drives or actuator positioning, not for high-current main drives. The solid-state motor protection covers overload and phase loss, with a mechanical switching contact for the main circuit. Communication is via PROFIBUS DP, not PROFINET, so it integrates into existing DP networks. The 4 digital inputs are parameterizable, giving you flexibility to wire limit switches, pushbuttons, or sensor feedback directly into the starter without a separate I/O block. Supply voltage is 24 V DC nominal (20.4–28.8 V range), which is standard for control circuits. The unit measures 250 mm high, 130 mm wide, and 107 mm deep. The load-side outgoing feeder and main energy infeed both use sockets per ISO 23570 — a standardized connector interface that speeds wiring and reduces termination errors. The line-side supply voltage connects via a hybrid plug, and communication transmission uses a hybrid socket. This modular connector scheme means you pre-cable the panel harness and simply plug the starter in during commissioning. ## Sourcing posture The combination of IP65, PROFIBUS DP, and 3 A AC-3 rating makes it a specific fit for small reversing motor applications in wet or dusty environments — confirm the 3 A motor rating matches your load before committing the BOM line.","metaTitle":"Siemens 3RK1303-5BS44-3AA0 Reversing Starter, IP65, 3 A AC-3","metaDescription":"Siemens 3RK1303-5BS44-3AA0 reversing starter, 3 A at 400 V AC-3, IP65, PROFIBUS DP, 4 digital inputs, 100 kA SCCR, current lifecycle. Sourced to order against RFQ.","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":"4","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":"3 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":"1 100 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":"0.3 ... 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$737.87","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=214449&mlfb=3RK1303-5BS44-3AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1303-5BS44-3AA0/alternatives.json"},"ai":{"faq":[{"question":"Does this unit support PROFINET or only PROFIBUS?","answer":"It supports PROFIBUS DP only; PROFINET protocol is explicitly not supported on this variant."},{"question":"What is the enclosure rating and where can it be installed?","answer":"IP65 protection means it is dust-tight and protected against water jets, so it can be installed in washdown areas or outdoors without a separate cabinet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1303-5BS44-3AA0","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/3RK1303-5BS44-3AA0 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}}