{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3BQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3BQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3BQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3BQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3BQ54-0BA2 motor starter MCU for AS-Interface, direct starter, 0.8 A at 400 V AC-3, Class 10, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## AS-Interface motor starter with integrated brake control The 3RK4320-3BQ54-0BA2: It includes a motor brake output component, making it suitable for applications requiring controlled deceleration without a separate brake contactor. ## Motor protection and duty cycle The AC-3 rating of 0.8 A at 400 V covers small motor loads up to about 0.4 kW; the operating frequency is limited to 80 operations per hour, so it fits intermittent-duty conveyors, pumps, and valve actuators rather than high-cycling pick-and-place stations. Short-circuit protection is handled by upstream circuit breakers, not fuses — the starter is designed to coordinate with Siemens 3RV breakers in a Type 1 or Type 2 coordination scheme. ## Bus integration and I/O AS-Interface is the only fieldbus protocol supported — no PROFINET or PROFIBUS DP onboard, so this starter belongs on an AS-i network segment, not a Profinet ring. Two digital inputs are integrated into the housing, allowing local sensor feedback (e.g., limit switches or proximity sensors) to be wired directly without an extra I/O block. Control supply is 24 V DC nominal (20.4–26.4 V range), sourced from the AS-Interface yellow cable or an external power supply. ## Panel fit and environmental limits IP54 protection means it is dust-protected and splash-resistant — suitable for control cabinets in factory-floor environments but not for direct washdown zones. Ambient operating range is -25 to +50 °C, covering most indoor industrial conditions without derating.","metaTitle":"Siemens 3RK4320-3BQ54-0BA2 SIRIUS Motor Starter, 0.8 A","metaDescription":"Siemens 3RK4320-3BQ54-0BA2 SIRIUS motor starter for AS-Interface, 0.8 A at 400 V AC-3, Class 10 trip, IP54. Current 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":"3RK4320-3BQ54-0BA2","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 0.80 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":"0.8 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":"0.8 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":"0.2 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","maximum short-circuit current breaking capacity (Icu) at 400 V rated value":"50 000 A","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.55 ... 0.8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/baecec863c3b6175618494eafc5b6d63.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=22507&mlfb=3RK4320-3BQ54-0BA2"},"ai":{"faq":[{"question":"Does 3RK4320-3BQ54-0BA2 support PROFINET or PROFIBUS?","answer":"No — it supports only AS-Interface protocol; PROFINET DP and PROFIBUS DP are not supported."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3BQ54-0BA2","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/3RK4320-3BQ54-0BA2 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}}