{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3LR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3LR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3LR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3LR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3LR51-0BA0 motor starter MCU for AS-Interface, direct starter, 6.3 A at 400 V AC-3, CLASS 10, IP55, 145 x 182 x 220 mm.","salesMarkdown":"The 3RK4320-3LR51-0BA0 is a SIRIUS motor starter MCU designed for AS-Interface networks — it combines a direct starter, bimetal overload protection, and bus communication in one IP55 housing. The control supply is 20.4–26.4 V DC, so it runs on a standard 24 VDC control loop, and the AS-Interface protocol support lets you integrate it into a distributed I/O architecture without a separate fieldbus coupler. ## Mounting and environmental fit for enclosure planning Dimensions are 145 mm deep, 182 mm wide, and 220 mm high — check your sub-panel real estate before committing, especially the depth if the enclosure is shallow. IP55 means it's protected against dust ingress and water jets from any direction — suitable for standalone mounting in washdown areas or inside a sealed enclosure where condensation is a concern. Ambient operating range is -25 to +35 °C — if your panel sits near a heat source or in a hot climate, derate or ventilate to stay inside that envelope.","metaTitle":"Siemens 3RK4320-3LR51-0BA0 SIRIUS Motor Starter, 6.3 A","metaDescription":"Siemens 3RK4320-3LR51-0BA0 SIRIUS motor starter MCU for AS-Interface, 6.3 A at 400 V AC-3, CLASS 10, IP55. Active production, sourced to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","title":"3RK4320-3LR51-0BA0","Height":"220 mm","Trip Class":"CLASS 10","description":"SIRIUS MCU motor starter Enclosure degree of protection IP55 plastic Communication AS-Interface electromechanically switching Short-circuit protection with circuit breaker DOL starter Brake without Performance class 6.30 A Motor circuit breaker with bi-metal thermal Manual operation without Connection power M screw connection Standard product","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":"6.3 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":"6.3 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":"2.2 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":"4.5 ... 6.3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a410d6c69a215c885deeeed1509a2e73.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=39216&mlfb=3RK4320-3LR51-0BA0"},"ai":{"faq":[{"question":"What is the lead time for the 3RK4320-3LR51-0BA0?","answer":"Lead time and stock availability are confirmed at quote time against your specific order quantity. Submit an RFQ for current lead time and pricing."},{"question":"What are the key ratings for the 3RK4320-3LR51-0BA0?","answer":"Rated 6.3 A at AC-3 duty at 400 V, CLASS 10 trip class, IP55 protection, control supply 20.4–26.4 V DC, and AS-Interface bus communication."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3LR51-0BA0","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/3RK4320-3LR51-0BA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}