{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3NQ54-0BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3NQ54-0BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3NQ54-0BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3NQ54-0BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3NQ54-0BA3 motor starter MCU for AS-Interface, direct starter, CLASS 10, 10 A AC-3 at 400 V, 3-pole, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## AS-Interface motor starter — what it does in the panel The 3RK4320-3NQ54-0BA3: Rated 10 A at 400 V AC for general use, and the same 10 A in AC-3 switching category — that's the motor-running current it handles, not just resistive load. ## Power and control supply — DC bus, brake output Control supply is 20.4 to 26.4 V DC — standard 24 V nominal, but the wide tolerance covers a sagging bus. Includes a motor brake output for 400 V AC — that's a separate contactor or relay inside the unit for holding a brake, not just the main motor switching. ## Mounting and environment — panel fit, IP54 Mounts on a vertical surface with ±180° rotation possible, and can be tilted forward/backward ±22.5° — gives flexibility for cable entry orientation in a crowded cabinet. Dimensions 205 mm deep, 245 mm wide, 215 mm high. IP54 protection — sealed against dust ingress and splashing water, suitable for industrial floors near washdown areas but not submerged. Ambient range -25 to +50 °C. ## I/O and fieldbus — two digital inputs, AS-Interface only Two digital inputs onboard — can take limit switches or pushbuttons directly without an extra I/O block. Bus communication is AS-Interface only; no PROFIBUS DP or PROFINET on this variant. Short-circuit protection is built in via circuit-breakers (external upstream, but coordinated per the design). The unit itself is electromechanical switching — not a solid-state starter. ## Compliance and documentation Substance prohibitance date 05/01/2012 aligns with RoHS/REACH compliance — the unit meets EU substance restrictions as of that date. Reference code per IEC 81346-2 is Q (power switching device).","metaTitle":"Siemens 3RK4320-3NQ54-0BA3 SIRIUS Motor Starter","metaDescription":"Siemens SIRIUS 3RK4320-3NQ54-0BA3 motor starter MCU for AS-Interface, direct starter, CLASS 10, 10 A AC-3 at 400 V, 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":"3RK4320-3NQ54-0BA3","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 400 V AC (internal) 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":"Yes","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/06e556e79f302829952676a94439e70b.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=140078&mlfb=3RK4320-3NQ54-0BA3"},"ai":{"faq":[{"question":"What fieldbus protocol does this motor starter support?","answer":"It supports AS-Interface protocol only. It does not support PROFIBUS DP or PROFINET."},{"question":"What is the trip class and motor protection type?","answer":"Trip class is CLASS 10, with bimetal thermal overload protection. The switching contact is electromechanical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3NQ54-0BA3","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/3RK4320-3NQ54-0BA3 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}}