{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-5DQ64-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-5DQ64-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-5DQ64-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-5DQ64-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-5DQ64-1BA2 reversing motor starter, solid-state switching, 1.25 A at 400 V AC-3, Class 10, AS-Interface, IP54, 205 x 290 x 215 mm.","salesMarkdown":"## Solid-state reversing starter with AS-Interface The Siemens 3RK4320-5DQ64-1BA2 is a SIRIUS reversing motor starter built around solid-state switching contacts and solid-state motor protection. Unlike a conventional electromechanical reversing contactor pair, this unit has no moving contacts to arc or weld — the semiconductor output handles the direction reversal internally. It communicates over AS-Interface (the protocol is supported per the spec), so it lands as a fieldbus slice on an AS-i network. Two onboard digital inputs let the starter accept local control signals without an additional I/O block. ## Supply and control voltage envelope The main circuit operates on 340...460 V AC at 50 or 60 Hz, 3-pole. The control supply is 20.4...26.4 V DC — a standard 24 VDC panel rail works, but the 20.4 V floor means the starter stays operational during a moderate brownout on the control bus. IP54 protection means the housing is dust-protected and splash-resistant — suitable for cabinet mounting, not direct washdown. This gives flexibility for tight panel layouts where the starter must sit at an angle to clear gland plates or busbars. ## Dimensions and panel fit The enclosure measures 205 mm deep by 290 mm wide by 215 mm high. That footprint is larger than a typical IEC reversing contactor pair because the solid-state power stage and AS-Interface electronics are integrated into one housing. Plan for this when laying out the backplate — the 290 mm width may span two DIN-rail sections if mounted side-by-side with other starters. ## Cycling and protection coordination The starter is rated for 3600 operating cycles per hour — that is one start-reverse-stop every second. The solid-state output handles this without the mechanical fatigue that limits an electromechanical contactor's life at high cycling rates. Short-circuit protection is designed for use with circuit-breakers upstream, not fuses. The unit includes a motor brake output component (24 V DC brake control is not present, but the brake output provision is built into the design). For applications requiring a holding brake, this saves an external brake rectifier or relay.","metaTitle":"Siemens 3RK4320-5DQ64-1BA2 SIRIUS Reversing Motor Starter","metaDescription":"Siemens SIRIUS 3RK4320-5DQ64-1BA2 reversing motor starter, 1.25 A at 400 V AC-3, Class 10, solid-state switching, AS-Interface, IP54.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"290 mm","title":"3RK4320-5DQ64-1BA2","Height":"215 mm","Trip Class":"CLASS 10","description":"SIRIUS MCU motor starter Enclosure degree of protection IP54 metal Communication AS-Interface Electronic switching Short-circuit protection with circuit breaker Reversing starter Brake 230 V AC (internal) Performance class 1.25 A Motor protection electronic Overload relay with thermal motor model Manual operation with manual operation momentary contact type 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":"1.25 A","brake control with 24 V DC":"No","Operating Frequency Minimum":"3 600 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":"solid-state","at AC-3 at 400 V rated value":"1.25 A","Operating Voltage Rated Value":"340 ... 460 V","Substance Prohibitance (Date)":"05/01/2012","Design Of The Switching Contact":"solid-state","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":"0.4 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":"0.32 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3d4feaa77c0b12a040bfbf6b4e080874.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=473065&mlfb=3RK4320-5DQ64-1BA2"},"ai":{"faq":[{"question":"What is the rated motor current for 3RK4320-5DQ64-1BA2?","answer":"This is the motor-switching current for a reversing starter application. The solid-state overload is set to Class 10 trip characteristic."},{"question":"What communication protocol does this motor starter use?","answer":"It supports AS-Interface protocol. There is no PROFIBUS DP or PROFINET onboard — the AS-i interface is the only fieldbus connection. Two digital inputs are available for local control signals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-5DQ64-1BA2","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/3RK4320-5DQ64-1BA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}