{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3NQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3NQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3NQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU for AS-Interface, reversing starter, 10 A at AC-3 400 V, IP54, Trip Class 10, 3RK4320-3NQ51-1BA2.","salesMarkdown":"Its reversing contactor arrangement lets a single device control motor direction without an external interlock — the mechanical and electrical interlocking is built in. The control supply is 20.4 to 26.4 V DC, so it integrates directly into a 24 V DC control circuit common in industrial panels. Two digital inputs are onboard for start/stop and direction commands over the AS-Interface network. The 10 A AC-3 rating at 400 V governs motor switching — this is the load current for standard squirrel-cage motors during starting and running. The operating voltage range is 340 to 440 V AC at 50/60 Hz, covering 400 V nominal supplies with tolerance for brownout conditions. Ambient temperature range of -25 to +50 °C suits unheated enclosures in temperate climates. IP54 protection means the enclosure is dust-protected and splash-proof — suitable for control cabinets in industrial environments but not for direct washdown or outdoor exposure without additional enclosure. Dimensions are 245 mm wide, 215 mm high, and 205 mm deep. The unit includes a motor brake output component, so it can control a holding brake directly from the starter — no separate brake rectifier needed for DC brake coils.","metaTitle":"Siemens 3RK4320-3NQ51-1BA2 SIRIUS Reversing Starter","metaDescription":"Siemens SIRIUS 3RK4320-3NQ51-1BA2 reversing motor starter with AS-Interface communication, rated 10 A at AC-3 400 V, IP54, Trip Class 10.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3NQ51-1BA2","Height":"215 mm","Trip Class":"CLASS 10","description":"SIRIUS MCU motor starter Enclosure degree of protection IP54 metal Communication AS-Interface electromechanically switching Short-circuit protection with circuit breaker Reversing starter Brake 230 V AC (intrinsic) Performance class 10.00 A Motor circuit breaker with bi-metal thermal Rotary operating mechanism gray/black 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":"IP54","PROFIBUS DP protocol":"No","Design Of The Product":"reversing starter","Number Of Digital Inputs":"2","Short Circuit Protection":"Yes","at AC at 400 V rated value":"10 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":"10 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 ... +50 °C","Product Component Motor Brake Output":"Yes","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":"4 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":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0eabfff7fb39114c7b4b67d502368e73.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=46047&mlfb=3RK4320-3NQ51-1BA2"},"ai":{"faq":[{"question":"Is 3RK4320-3NQ51-1BA2 a reversing starter?","answer":"Yes, the product design is a reversing starter, meaning it has two contactors mechanically and electrically interlocked to reverse a three-phase motor without external wiring."},{"question":"Is 3RK4320-3NQ51-1BA2 compatible with AS-Interface?","answer":"Yes, it supports the AS-Interface protocol for bus communication, with two digital inputs available for control commands over the network."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-1BA2","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/3RK4320-3NQ51-1BA2 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}}