{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3FQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3FQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3FQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3FQ54-0BA2, AS-Interface motor starter MCU, direct starter, CLASS 10, 2 A at AC-3 400 V, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## AS-Interface motor starter for distributed motor control AS-Interface protocol is supported natively, so it drops onto a two-wire AS-i bus without a separate gateway — the bus carries both power and I/O data to the starter. Two digital inputs are available for local sensors or pushbuttons, and a motor brake output is built in for holding-brake applications on vertical-axis drives. AC-3 covers starting and plugging of squirrel-cage motors, so this starter fits small motors (roughly 0.75 kW at 400 V three-phase) on conveyors, pumps, or fans. Operating voltage of 340 to 440 V AC at 50/60 Hz covers standard three-phase supplies across most industrial regions; the control supply is 20.4 to 26.4 V DC drawn from the AS-Interface bus. Short-circuit protection is provided by circuit breakers, not fuses — coordinate the upstream breaker rating with the starter's 2 A AC-3 rating for selective coordination. Compliance documentation covers RoHS and REACH (substance prohibitance date 05/01/2012,).","metaTitle":"Siemens 3RK4320-3FQ54-0BA2 AS-Interface Motor Starter","metaDescription":"Siemens SIRIUS 3RK4320-3FQ54-0BA2 AS-Interface motor starter. CLASS 10, 2 A at AC-3 400 V, IP54. Current lifecycle. 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":"3RK4320-3FQ54-0BA2","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 2.00 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":"2 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":"2 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":"0.8 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":"1.4 ... 2 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/16bc7227ba03ff895e222c8d4fec6690.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=438267&mlfb=3RK4320-3FQ54-0BA2"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 3RK4320-3FQ54-0BA2?","answer":"Submit an RFQ through this listing. Pricing and stock are confirmed at quote time through independent distribution channels."},{"question":"Will 3RK4320-3FQ54-0BA2 drop into a panel specified around 3RT1044-1FB46?","answer":"No — the 3RT1044-1FB46 is a contactor-only device with a different footprint and no AS-Interface bus interface. The 3RK4320-3FQ54-0BA2 is a larger, self-contained motor starter with integrated overload and communication; rewiring and panel re-layout are required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-0BA2","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/3RK4320-3FQ54-0BA2 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}}