{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3FQ54-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3FQ54-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3FQ54-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS MCU reversing motor starter, 3RK4320-3FQ54-1BA2, for AS-Interface, 2 A AC-3 at 400 V, CLASS 10, IP54, 24 VDC control.","salesMarkdown":"The Siemens 3RK4320-3FQ54-1BA2 is a SIRIUS MCU reversing motor starter designed for AS-Interface bus communication. It integrates a reversing contactor pair, a CLASS 10 bimetal overload relay, and short-circuit protection via circuit-breakers into a single 245 mm wide enclosure. The 2 A AC-3 rating at 400 V means it switches small reversing motor loads — conveyors, diverters, gate drives — up to that current in standard 50/60 Hz networks. The 24 VDC control supply (20.4...26.4 V) keeps it on the same low-voltage bus as the AS-Interface network and PLC outputs. The 2 A AC-3 rating is the motor-switching current, not the resistive (AC-1) rating; if your motor full-load amps exceed 2 A at 400 V, this starter is undersized. The IP54 enclosure keeps out dust and splashing water, so it suits panel-mount or machine-mounted locations that aren't directly hosed down. ## AS-Interface integration and I/O This starter communicates exclusively via AS-Interface protocol — no PROFIBUS or PROFINET onboard. It provides 2 digital inputs for local sensors (e.g., limit switches or emergency stops wired directly to the starter), reducing separate I/O module count. The reversing design means a single unit handles forward/reverse control of a motor, with mechanical and electrical interlocking built in. The 340...440 V operating voltage range covers 400 V nominal supplies with typical tolerance.","metaTitle":"Siemens 3RK4320-3FQ54-1BA2 SIRIUS Reversing Starter","metaDescription":"Siemens SIRIUS 3RK4320-3FQ54-1BA2 reversing motor starter for AS-Interface, 2 A AC-3 at 400 V, CLASS 10, 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","Height":"215 mm","Trip Class":"CLASS 10","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":"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,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=461679&mlfb=3RK4320-3FQ54-1BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3FQ54-1BA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RK4320-3FQ54-1BA2 and get a price?","answer":"This part is available to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."},{"question":"What is the difference between 3RK4320-3FQ54-1BA2 and 3RK4320-3FQ54-1BA0?","answer":"The evidence does not contain specifications for the -1BA0 variant, so a direct comparison cannot be made from this data. Verify the specific order code against your BOM."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-1BA2","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/3RK4320-3FQ54-1BA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}