{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3KQ54-1BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3KQ54-1BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-1BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3KQ54-1BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3KQ54-1BA3 reversing motor starter, MCU for AS-Interface, 5 A AC-3 at 400 V, Class 10, DC control supply 20.4-26.4 V, IP54.","salesMarkdown":"## Active SIRIUS reversing starter with AS-Interface bus The 3RK4320-3KQ54-1BA3: It integrates a reversing contactor, bimetal motor protection (Class 10), and an AS-Interface interface in one unit — reducing panel wiring and component count for reversing applications. ## 5 A AC-3 at 400 V, Class 10 thermal protection Control supply is 24 V DC nominal (20.4–26.4 V range), which is the standard for industrial PLC and safety relay outputs — no separate AC control transformer needed in a DC control panel. ## AS-Interface bus and integrated motor brake output The starter communicates via AS-Interface protocol (supports AS-i), with 2 digital inputs on board for local sensors or pushbuttons — reducing the need for a separate I/O block at the motor. A motor brake output is built in, controlled at 400 V AC — suitable for directly switching a holding brake on a reversing conveyor or hoist application without an external brake contactor. ## IP54 enclosure, 205 mm depth, current production Rated IP54, the housing is protected against dust ingress and splashing water — suitable for installation in control cabinets on the plant floor where occasional washdown or dust is present. Physical footprint: 245 mm wide, 215 mm tall, 205 mm deep — confirm panel cutout and clearance for the reversing starter's depth before committing to a retrofit.","metaTitle":"Siemens 3RK4320-3KQ54-1BA3 SIRIUS Reversing Starter","metaDescription":"Siemens 3RK4320-3KQ54-1BA3 SIRIUS reversing motor starter, 5 A AC-3 at 400 V, Class 10, AS-Interface bus, 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":"3RK4320-3KQ54-1BA3","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 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":"Yes","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","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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/38140458c97557414ed4bec48dd30ba2.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=349004&mlfb=3RK4320-3KQ54-1BA3"},"ai":{"faq":[{"question":"What is the AC-3 rated current of this reversing starter?","answer":"The AC-3 rating is the figure that governs motor switching life — use this for sizing against your motor FLA."},{"question":"What communication protocol does this starter use?","answer":"It uses AS-Interface protocol (AS-i). It does not support PROFIBUS DP or PROFINET — confirm your network infrastructure supports AS-i before specifying."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-1BA3","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/3RK4320-3KQ54-1BA3 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}}