{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3KQ54-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3KQ54-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3KQ54-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3KQ54-1BA2 reversing motor starter, AS-Interface bus communication, 5 A at 400 V AC-3, CLASS 10, IP54, 245 x 205 x 215 mm.","salesMarkdown":"## Reversing starter with AS-Interface — what fits in the panel The Siemens 3RK4320-3KQ54-1BA2 is a SIRIUS reversing motor starter with integral AS-Interface bus communication — a single unit that handles forward/reverse motor control and overload protection over a two-wire network. The enclosure measures 245 mm wide by 205 mm deep by 215 mm high with IP54 protection — splash-proof and dust-limited, suited for panel-mount in industrial environments where occasional washdown or airborne dust is present. ## Control supply and bus integration Control supply is 20.4–26.4 V DC — standard 24 V nominal, drawn from the AS-Interface bus or a separate DC rail. The unit communicates over AS-Interface protocol, not PROFIBUS or PROFINET, so the network master must support AS-I. Two digital inputs are available on the unit for local control signals or feedback, reducing the need for separate I/O blocks at the motor centre. ## Mounting flexibility and motor brake output The unit mounts on a vertical surface with ±180° rotation possible and can be tilted forward/backward by ±22.5° — useful for cable entry positioning in tight enclosures or when aligning with existing conduit. A motor brake output is included as a product component — the starter can control an external brake coil directly, eliminating a separate brake contactor for reversing applications that need holding brakes. Maximum operating frequency is 80 operations per hour — this is a duty-cycle limit for the bimetal overload and contactor wear, not a continuous switching rate.","metaTitle":"Siemens 3RK4320-3KQ54-1BA2 SIRIUS reversing starter","metaDescription":"Siemens SIRIUS 3RK4320-3KQ54-1BA2 reversing motor starter for AS-Interface, 5 A at 400 V AC-3, CLASS 10, IP54, current 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":"3RK4320-3KQ54-1BA2","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 (internal) Performance class 5.00 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":"5 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":"5 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":"1.5 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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c5247c03d84b7ad9939bf4afdeb35247.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=148068&mlfb=3RK4320-3KQ54-1BA2"},"ai":{"faq":[{"question":"What is the closest alternative to 3RK4320-3KQ54-1BA2?","answer":"The 3RK4320-3KQ54-1BA2 is a specific reversing starter with AS-Interface bus communication; a replacement would require a different bus protocol or a separate reversing contactor plus AS-I gateway."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-1BA2","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/3RK4320-3KQ54-1BA2 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}}