{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3HR51-1BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3HR51-1BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3HR51-1BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3HR51-1BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3HR51-1BA0 reversing motor starter, MCU for AS-Interface, 3.2 A at 400 V AC-3, CLASS 10, IP55, electromechanical bimetal protection, DC control 24 V.","salesMarkdown":"## Reversing starter on AS-Interface — what it replaces in a panel The Siemens 3RK4320-3HR51-1BA0 is a SIRIUS reversing motor starter — a single unit that handles forward/reverse control of a 3-phase motor up to 3.2 A at 400 V AC-3, with built-in bimetal overload protection (CLASS 10 trip class). This isn't a bare contactor stack; it's a fully integrated motor control unit (MCU) that communicates over AS-Interface, so it drops the separate I/O wiring and fieldbus gateway for a reversing station. The short-circuit protection is designed for circuit-breaker coordination (not fuses), so the upstream breaker must be selected per Siemens coordination tables to keep the starter undamaged through a fault. Operating frequency is rated at 80 operations per hour minimum — that's about one start every 45 seconds, fine for conveyor or pump cycling but not for high-speed reversing like a positioning axis. ## IP55 and mounting — where this lives in the plant IP55 enclosure means it's dust-protected and can handle water jets from any direction — suitable for washdown areas in food processing or outdoor installation under a roof, but not for submersion or high-pressure spray. Dimensions are 182 mm wide × 220 mm high × 145 mm deep — it's a compact block that fits a standard 400 mm deep enclosure with room for the AS-Interface cable bend radius. ## Lifecycle and sourcing — active, quoted to order Substance prohibition date of 05/01/2012 indicates RoHS compliance per Siemens internal tracking — the part meets the EU RoHS directive as of that date, with no REACH SVHC declaration in this record. No minimum order quantity is stated — quoted per your line item.","metaTitle":"Siemens 3RK4320-3HR51-1BA0 SIRIUS Motor Starter, 3.2 A","metaDescription":"Siemens 3RK4320-3HR51-1BA0 SIRIUS reversing motor starter, 3.2 A at 400 V AC-3, CLASS 10, IP55, AS-Interface bus. Active production, quoted 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","title":"3RK4320-3HR51-1BA0","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 Reversing starter Brake without Performance class 3.20 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":"reversing starter","Number Of Digital Inputs":"0","Short Circuit Protection":"Yes","at AC at 400 V rated value":"3.2 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":"3.2 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":"1.1 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":"2.2 ... 3.2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3e39c44fbaa88a092a823fa136dcb796.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=236106&mlfb=3RK4320-3HR51-1BA0"},"ai":{"faq":[{"question":"What compliance documentation does Siemens provide for 3RK4320-3HR51-1BA0?","answer":"No UL, CSA, or IEC certification numbers are listed in this record — typical for a SIRIUS MCU that ships with a CE declaration and manufacturer's declaration of conformity for the AS-Interface system."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3HR51-1BA0","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/3RK4320-3HR51-1BA0 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}}