{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3KQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3KQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3KQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3KQ54-0BA2 motor starter MCU for AS-Interface, direct starter, 5 A at 400 V AC-3, Class 10, IP54, 3-pole, DC control voltage.","salesMarkdown":"## SIRIUS MCU with AS-Interface — 5 A motor duty The 3RK4320-3KQ54-0BA2 is a Siemens SIRIUS motor starter MCU (Motor Control Unit) designed as a direct starter for AS-Interface networks. It integrates the contactor, overload relay, and communication interface into a single unit, saving panel space and wiring compared to a discrete starter build. It speaks AS-Interface natively (protocol supported), so it drops into an AS-i network without a separate gateway module. The control supply is 20.4–26.4 V DC, typical for AS-i power supplies, and the unit handles 50/60 Hz line frequencies. ## Panel fit and mounting flexibility Rated IP54, so it is protected against dust ingress and splashing water — suitable for installation inside a panel or in a protected machine cabinet. Ambient operating range is -25 to +50 °C, covering most industrial floor conditions without derating. ## Motor protection and brake control Motor protection is via a bimetal overload relay — the classic thermal model that tracks the motor's heating curve. Short-circuit protection is handled by upstream circuit breakers (not built-in), so coordinate the branch circuit breaker with the starter's 5 A AC-3 rating. The unit includes a motor brake output component (24 V DC brake control is not present, but the hardware is there for a brake option). Two digital inputs are available on-board for local sensors or pushbuttons, reducing the need for separate I/O modules. Minimum operating frequency is 80 cycles per hour — fine for normal start/stop duty; if you need higher cycling (e.g., rapid reversing), this starter is not the right fit. ## Sourcing and lifecycle — active production No stock-holding claim; we confirm per RFQ.","metaTitle":"Siemens 3RK4320-3KQ54-0BA2 SIRIUS Motor Starter, 5 A","metaDescription":"Siemens 3RK4320-3KQ54-0BA2 SIRIUS motor starter, 5 A at 400 V AC-3, AS-Interface, Class 10, IP54. Active production. Quoted to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3KQ54-0BA2","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 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":"direct 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":"No","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","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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5743e912bb2c3325397c1ff8cc5e77ca.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=392701&mlfb=3RK4320-3KQ54-0BA2"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3KQ54-0BA2","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/3RK4320-3KQ54-0BA2 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}}