{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3CQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3CQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3CQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3CQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3CQ54-0BA2 MCU motor starter, AS-Interface, direct starter, 1 A at 400 V AC-3, Class 10, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## What this SIRIUS motor starter does on an AS-Interface line The Siemens 3RK4320-3CQ54-0BA2 is a SIRIUS MCU motor starter designed as a direct starter for AS-Interface networks — it integrates the motor protection, switching, and fieldbus communication into one unit that bolts onto a vertical mounting surface. ## AS-Interface integration and I/O count Two onboard digital inputs let the starter pick up local limit switches or pushbuttons without a separate I/O block — the AS-Interface protocol carries the status and control words back to the PLC over the yellow flat cable. The control supply is 20.4–26.4 V DC, which matches the AS-Interface bus power rail — no separate 24 V supply needed for the electronics. ## Mounting and environmental fit At 205 mm deep, 245 mm wide, and 215 mm tall, this starter takes up a panel footprint comparable to a small contactor-and-overload combo — plan the DIN-rail or screw-mount layout accordingly. IP54 means it's protected against dust ingress and splashing water — fine for most control cabinets, but not for washdown zones. Ambient operating range is -25 to +50 °C, covering most indoor industrial environments without derating.","metaTitle":"Siemens 3RK4320-3CQ54-0BA2 SIRIUS Motor Starter, 1 A AC-3","metaDescription":"Siemens 3RK4320-3CQ54-0BA2 SIRIUS MCU motor starter for AS-Interface, 1 A at 400 V AC-3, Class 10, IP54, DC control. Active production, 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":"3RK4320-3CQ54-0BA2","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 1.00 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":"1 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":"1 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":"0.3 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":"0.7 ... 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6c62dff6a3fc078e9d47f6748360501f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=506121&mlfb=3RK4320-3CQ54-0BA2"},"ai":{"faq":[{"question":"What is the rated current of 3RK4320-3CQ54-0BA2 at 400 V?","answer":"It is rated 1 A at 400 V for both general AC duty and AC-3 motor switching. The Class 10 bimetal overload provides motor protection for loads up to that current."},{"question":"Does 3RK4320-3CQ54-0BA2 support AS-Interface?","answer":"Yes, the AS-Interface protocol is supported, and the starter is specifically designated as an MCU for AS-Interface. It communicates over the AS-Interface bus for control and status."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3CQ54-0BA2","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/3RK4320-3CQ54-0BA2 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}}