{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3MQ54-1BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3MQ54-1BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3MQ54-1BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3MQ54-1BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU for AS-Interface, reversing starter, 3 poles, 8 A at AC-3/400 V, CLASS 10, IP54, DC control supply, brake output.","salesMarkdown":"The Siemens 3RK4320-3MQ54-1BA3 is a SIRIUS motor starter MCU designed for AS-Interface bus communication — a reversing starter with electromechanical switching contacts, rated 8 A at AC-3, 400 V (motor duty) and protected by a CLASS 10 bimetal overload relay. It carries a DC control supply (20.4... 26.4 V) and includes a motor brake output for 400 V AC, making it suitable for reversing applications that need a brake release on a conveyor or hoist. The IP54 enclosure means it is dust-protected and splash-resistant — fine for a control cabinet or a protected machine-mount location, but not for washdown zones. At AC-3, 400 V the rated operational current is 8 A — that is the motor-switching current for a 3-phase induction motor up to roughly 4 kW (depending on efficiency and duty). The operating voltage range is 340... 440 V, 50/60 Hz. Ambient temperature during operation is -25... +50 °C. The unit measures 245 mm wide × 215 mm high × 205 mm deep — a substantial footprint for a reversing starter with integrated brake output and AS-Interface electronics. ## AS-Interface integration and I/O This starter communicates exclusively over AS-Interface (no PROFIBUS DP, no PROFINET). It has 2 digital inputs on board, which can be used for local pushbuttons or limit switches without an extra I/O block. The brake control output is rated for 400 V AC, so it switches an external brake coil directly — no intermediate relay needed for that voltage class.","metaTitle":"Siemens 3RK4320-3MQ54-1BA3 SIRIUS Motor Starter","metaDescription":"Siemens SIRIUS 3RK4320-3MQ54-1BA3 reversing motor starter for AS-Interface. Rated 8 A at AC-3, 400 V, CLASS 10 trip, IP54. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3MQ54-1BA3","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 400 V AC (internal) Performance class 8.00 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":"8 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":"Yes","brake control with 500 V DC":"No","Type Of The Motor Protection":"bimetal","at AC-3 at 400 V rated value":"8 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":"3 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":"5.5 ... 8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/86b221bb5ba73eb28ce501aacd8b2901.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=22297&mlfb=3RK4320-3MQ54-1BA3"},"ai":{"faq":[{"question":"Where can I buy the 3RK4320-3MQ54-1BA3 and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at that time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3MQ54-1BA3","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/3RK4320-3MQ54-1BA3 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}}