{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3PR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3PR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3PR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3PR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3PR51-0BA0, direct starter, 12 A at AC-3, 400 V, IP55, Class 10.","salesMarkdown":"The bimetal overload relay provides motor protection with Trip Class 10, so it trips fast enough for most general-purpose motor applications without nuisance stops on a normal start. This is a DC-controlled unit: the control supply voltage is 20.4–26.4 VDC, and the main operating voltage range is 340–440 V AC at 50/60 Hz. The enclosure carries an IP55 rating, which means it's dust-protected and withstands water jets — suitable for installation in industrial environments where washdown or airborne particulates are a concern, though not for submersion. The starter measures 182 mm wide, 220 mm high, and 145 mm deep. It mounts on a vertical surface and allows ±180° rotation and ±22.5° forward/backward tilt, so panel layout can be adjusted to fit cable entry or clearance constraints. The AS-Interface bus connection eliminates separate point-to-point I/O wiring — the motor starter communicates directly over the AS-i network, which reduces field wiring and simplifies diagnostics in distributed control architectures.","metaTitle":"Siemens 3RK4320-3PR51-0BA0 motor starter MCU, AS-Interface","metaDescription":"Siemens 3RK4320-3PR51-0BA0 SIRIUS motor starter MCU for AS-Interface, rated 12 A at AC-3, 400 V. IP55, Class 10, current lifecycle. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","Height":"220 mm","Trip Class":"CLASS 10","Type Of Voltage":"DC","lifecycle_stage":"current","Bus Communication":"Yes","Mounting Position":"+/-180° rotation possible on vertical mounting surface; can be tilted forward and backward by +/- 22.5° on vertical mounting surface","PROFINET protocol":"No","Product Brand Name":"SIRIUS","Type Of Assignment":"1","Product Designation":"motor starter MCU for AS-Interface","protection class IP":"IP55","PROFIBUS DP protocol":"No","Design Of The Product":"direct starter","Number Of Digital Inputs":"0","Short Circuit Protection":"Yes","at AC at 400 V rated value":"12 A","brake control with 24 V DC":"No","Operating Frequency Minimum":"80 1/h","brake control with 180 V DC":"No","brake control with 400 V AC":"No","brake control with 500 V DC":"No","Type Of The Motor Protection":"bimetal","at AC-3 at 400 V rated value":"12 A","Operating Voltage Rated Value":"340 ... 440 V","Substance Prohibitance (Date)":"05/01/2012","Design Of The Switching Contact":"electromechanical","Operating Frequency 1 Rated Value":"50 Hz","Operating Frequency 2 Rated Value":"60 Hz","Design Of Short-Circuit Protection":"circuit-breakers","Ambient Temperature During Operation":"-25 ... +35 °C","Product Component Motor Brake Output":"No","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 ... 26.4 V","with low demand rate according to SN 31920":"50 %","protocol is supported AS-Interface protocol":"Yes","with high demand rate according to SN 31920":"75 %","operating power at AC-3 at 400 V rated value":"5.5 kW","Product Extension Braking Module For Brake Control":"No","Relative Negative Tolerance Of The Operating Frequency":"-10 %","Relative Positive Tolerance Of The Operating Frequency":"10 %","Type Of Electrical Connection For Main Current Circuit":"screw-type terminals","breaking capacity maximum short-circuit current (Icu) at 400 V rated value":"50 000 A","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"9 ... 12.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$553.71","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=201603&mlfb=3RK4320-3PR51-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3PR51-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Does 3RK4320-3PR51-0BA0 support AS-Interface communication?","answer":"Yes, the Siemens 3RK4320-3PR51-0BA0 is a motor starter MCU designed specifically for AS-Interface (AS-i) bus communication. It does not support PROFIBUS DP or PROFINET."},{"question":"Where can I buy 3RK4320-3PR51-0BA0?","answer":"We source the Siemens 3RK4320-3PR51-0BA0 to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3PR51-0BA0","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/3RK4320-3PR51-0BA0 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}}