{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3MQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3MQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3MQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3MQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3MQ54-0BA2 motor starter MCU for AS-Interface, direct starter, 8 A at 400 V AC-3, Trip Class 10, IP54, DC control supply 24 V.","salesMarkdown":"## Rated 8 A at 400 V AC-3 — motor switching capacity and protection The 3RK4320-3MQ54-0BA2: The same 8 A rating applies at AC at 400 V for general resistive or mixed loads. The main current circuit has 3 poles, and short-circuit protection is designed for coordination with circuit-breakers. Operating voltage range is 340-440 V at 50/60 Hz. The minimum operating frequency of 80 operations per hour sets the switching rate limit for cyclic applications — exceeding this shortens the electromechanical contact life. ## DC control supply and AS-Interface integration Control supply voltage is 20.4-26.4 V DC, making this starter compatible with standard 24 V DC control systems. The AS-Interface protocol is supported (bus communication enabled), so it integrates directly into an AS-i network without a separate gateway module for the motor starter function. Two digital inputs are onboard for local sensor feedback or command signals. A motor brake output component is included, but brake control options are absent for 24 V DC, 180 V DC, 400 V AC, and 500 V DC — confirm brake wiring requirements separately if the application uses a brake motor. ## IP54 enclosure and mounting flexibility Dimensions are 205 mm depth, 245 mm width, 215 mm height. Duty rates per SN 31920 are 50% for low-demand and 75% for high-demand cycles — relevant for sizing the starter in applications with frequent starts. ## Compliance and substance prohibitance The reference code per IEC 81346-2 is Q (power switching device).","metaTitle":"Siemens 3RK4320-3MQ54-0BA2 SIRIUS Motor Starter, 8 A","metaDescription":"Siemens 3RK4320-3MQ54-0BA2 SIRIUS motor starter MCU for AS-Interface, 8 A at 400 V AC-3, Trip Class 10, IP54. Active production, quoted 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":"3RK4320-3MQ54-0BA2","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 (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":"direct 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":"No","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","maximum short-circuit current breaking capacity (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/c7094b831b1aa1401909f54a1f643733.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=64106&mlfb=3RK4320-3MQ54-0BA2"},"ai":{"faq":[{"question":"What is the rated current of the 3RK4320-3MQ54-0BA2 at 400 V?","answer":"It is rated 8 A at AC-3 duty at 400 V for motor loads, and also 8 A at AC at 400 V for general use. The Trip Class 10 bimetal overload protects standard motors during start-up."},{"question":"Does the 3RK4320-3MQ54-0BA2 support AS-Interface communication?","answer":"Yes, the AS-Interface protocol is supported, and bus communication is enabled. This allows direct integration into an AS-i network without a separate gateway for the motor starter function."},{"question":"What control supply voltage does the 3RK4320-3MQ54-0BA2 require?","answer":"The control supply voltage is 20.4-26.4 V DC, compatible with standard 24 V DC control systems. The type of voltage for the supply is DC."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3MQ54-0BA2","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/3RK4320-3MQ54-0BA2 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}}