{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3FQ54-0BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3FQ54-0BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-0BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3FQ54-0BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3FQ54-0BA3, direct starter, CLASS 10, 2 A at AC-3/400 V, IP54, 340-440 V operating voltage.","salesMarkdown":"It's a fully integrated motor control and protection unit — not just a contactor, but a combination of a contactor, overload relay, and AS-Interface communication interface in one housing. The operating voltage range is 340 to 440 V, covering common 400 V three-phase industrial supplies. This unit integrates two digital inputs and a motor brake output (24 V DC control supply, 20.4 to 26.4 V range), so it can handle local pushbuttons and a holding brake directly without an external interface module. The bimetal overload protection is electromechanical — a proven, field-reliable technology that doesn't depend on electronics for the thermal curve. Short-circuit protection is handled by circuit-breakers upstream, which the starter is coordinated with. ## Deployment context: panel integration and environment The 3RK4320-3FQ54-0BA3 is rated IP54, so it's suitable for installation in control cabinets where dust and splash ingress are a concern, but not for direct washdown zones. Dimensions are 245 mm wide by 215 mm high by 205 mm deep — a substantial footprint, so check your DIN-rail or backplate layout before committing. The unit communicates exclusively via AS-Interface — it does not support PROFIBUS DP or PROFINET, so the network architecture must be AS-i at the field level, with a gateway to higher-level fieldbuses if needed. If you need a cross-reference, the SIRIUS family includes other motor starters with different communication protocols or current ratings, but the AS-Interface variant is specific to this order code.","metaTitle":"Siemens 3RK4320-3FQ54-0BA3 SIRIUS Motor Starter, CLASS 10","metaDescription":"Siemens SIRIUS 3RK4320-3FQ54-0BA3 motor starter MCU for AS-Interface. CLASS 10 trip, 2 A at AC-3/400 V, IP54. Current 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","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":"direct 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":"Yes","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=498759&mlfb=3RK4320-3FQ54-0BA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3FQ54-0BA3/alternatives.json"},"ai":{"faq":[{"question":"Is 3RK4320-3FQ54-0BA3 compatible with AS-Interface?","answer":"Yes, the AS-Interface protocol is supported. This is an AS-Interface motor starter MCU. It does not support PROFIBUS DP or PROFINET."},{"question":"What is the IP rating of 3RK4320-3FQ54-0BA3?","answer":"The protection class is IP54. This means it is protected against limited dust ingress and splashing water from any direction. Suitable for control cabinet installation, not for direct washdown."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3FQ54-0BA3","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/3RK4320-3FQ54-0BA3 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}}