{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1303-2AS51-1AA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1303-2AS51-1AA0","canonicalUrl":"https://aoctrl.com/siemens/3RK1303-2AS51-1AA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1303-2AS51-1AA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK1303 reversing starter, IP65, PROFIBUS DP, 4 A at 400 V AC-3, 100 kA short-circuit rating, 24 V DC control.","salesMarkdown":"## Reversing starter with IP65 enclosure and PROFIBUS DP The Siemens 3RK1303-2AS51-1AA0 is a reversing starter in an IP65-rated enclosure, designed for direct-on-line reversing of three-phase motors up to 4 A at 400 V AC-3 duty. That AC-3 rating is the motor-switching current — the rating that governs real motor loads, not the resistive AC-1 figure. It handles reversing applications like conveyor direction change or pump valve positioning without external contactor interlocking. Control voltage is 24 V DC, with a permissible range of 20.4 to 28.8 V DC. The unit communicates via PROFIBUS DP, making it a fieldbus-integrated motor starter rather than a standalone contactor block. Two parameterizable digital inputs are available via M12 sockets, and the motor protection is thermistor-based. The IP65 rating means the enclosure withstands hose-directed water and dust ingress — suitable for washdown environments or outdoor installation without a separate cabinet. The unit measures 250 mm high by 130 mm wide by 107 mm deep. It uses hybrid plug/socket connections for the supply voltage line-side and load-side outgoing feeder, both per ISO 23570. The communication interface uses a hybrid plug as well, with a separate hybrid socket for the PROFIBUS DP transmission. This is a pre-wired, pluggable system — not a DIN-rail mount contactor you wire in the field.","metaTitle":"Siemens 3RK1303-2AS51-1AA0 reversing starter, IP65, 4A AC-3,","metaDescription":"Siemens reversing starter 3RK1303-2AS51-1AA0, IP65, 4A at 400V AC-3, PROFIBUS DP, 100kA SCCR, 24VDC control. Current lifecycle stage, 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":"thermistor","at AC-3 at 400 V rated value":"4 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":"0.3 ... 9 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$855.98","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=402648&mlfb=3RK1303-2AS51-1AA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1303-2AS51-1AA0/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings for this reversing starter?","answer":"AC-3 motor switching current is 4 A at 400 V. Short-circuit withstand is 100 kA at 400 V. Control voltage is 24 V DC (20.4 to 28.8 V range). Enclosure is IP65. Communication is PROFIBUS DP."},{"question":"Does this unit include digital inputs?","answer":"Yes, two parameterizable digital inputs are provided via M12 sockets. There are no digital outputs on this variant."},{"question":"What compliance documentation is available?","answer":"RoHS compliance is confirmed with a substance prohibition date of May 1, 2012. The unit is designed to meet applicable IEC standards for motor starters and enclosures."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1303-2AS51-1AA0","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/3RK1303-2AS51-1AA0 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}}