{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3NQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3NQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3NQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3NQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3NQ54-0BA2 motor starter MCU for AS-Interface, direct starter design, 10 A AC-3 at 400 V, 3-pole, CLASS 10, IP54, DC control supply 20.4-26.4 V.","salesMarkdown":"## AS-Interface integration — the bus-connected direct starter The 3RK4320-3NQ54-0BA2: Designated a motor starter MCU for AS-Interface, this unit integrates bus communication directly — it speaks the AS-Interface protocol, so no separate gateway module is needed for the motor-starting function on that fieldbus. It's a direct starter design (not reversing or star-delta), meaning one contactor handles the motor run with the bimetal overload relay built into the same housing — clean single-motor control on a single node address. Two digital inputs are on board for local start/stop or interlock signals, reducing the I/O count you'd otherwise need from a remote block. ## Rated load and protection — AC-3 at 10 A At AC at 400 V the rated value is also 10 A, confirming the thermal current rating matches the motor-switching rating — no derating between continuous and motor duty at this load point. Operating voltage range is 340... 440 V, covering 400 V nominal with tolerance for weak lines or generator supply, and the control supply is 20.4... 26.4 V DC — standard 24 V control power with a solid margin. ## Physical fit and mounting in the panel Dimensions are 245 mm wide by 205 mm deep by 215 mm high — it's a substantial block, not a slim contactor; plan for the full width when laying out DIN-rail components in the enclosure. IP54 rating means it's protected against dust ingress and splashing water — suitable for control cabinets in industrial environments, not for washdown zones. ## Motor brake output and short-circuit coordination Includes a product component motor brake output — so it can directly control a holding brake on the motor shaft without an external brake rectifier or relay, saving a DIN-rail slot and wiring terminations. Short-circuit protection is designed for circuit-breakers (not fuses), and the unit has short-circuit protection built in — coordination with a Type 1 or Type 2 upstream breaker is expected per the SIRIUS manual. ## Temperature range and compliance Ambient temperature during operation spans -25... +50 °C, covering most indoor industrial conditions without derating; the bimetal overload compensates across this range. Substance prohibitance date is 05/01/2012, aligning with RoHS and REACH compliance timelines — the part meets current EU substance restrictions. Reference code per IEC 81346-2 is Q, classifying it as a switching device in the plant documentation standard.","metaTitle":"Siemens 3RK4320-3NQ54-0BA2 SIRIUS Motor Starter, 10 A AC-3","metaDescription":"Siemens 3RK4320-3NQ54-0BA2 SIRIUS motor starter, direct starter design, 10 A AC-3 at 400 V, AS-Interface bus communication, IP54, current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3NQ54-0BA2","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 DOL 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":"direct 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/e19af77f0c5b7bb119aae6415168e5f2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=219679&mlfb=3RK4320-3NQ54-0BA2"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RK4320-3NQ54-0BA2?","answer":"Submit an RFQ for this order code."},{"question":"What is the rated motor current for 3RK4320-3NQ54-0BA2 in AC-3 duty?","answer":"It is rated 10 A at AC-3 at 400 V. This corresponds to a motor load of approximately 4–5 kW at 400 V three-phase, with CLASS 10 trip protection."},{"question":"What bus protocol does this motor starter support?","answer":"It supports the AS-Interface protocol natively — no external bus coupler is needed for the motor-starting function on that network."},{"question":"Does 3RK4320-3NQ54-0BA2 include a motor brake output?","answer":"Yes, it has a product component motor brake output, allowing direct control of a 24 V DC holding brake without an external brake module."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3NQ54-0BA2","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/3RK4320-3NQ54-0BA2 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}}