{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3BQ54-0BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3BQ54-0BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3BQ54-0BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3BQ54-0BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3BQ54-0BA3 motor starter MCU, direct starter, 0.8 A at 400 V AC-3, CLASS 10, AS-Interface communication, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## 0.8 A AC-3 motor duty with CLASS 10 bimetal protection The 3RK4320-3BQ54-0BA3: It communicates over AS-Interface (the protocol is supported per the spec), so it drops into an AS-i fieldbus slice without a separate gateway module for the motor starter. The control supply is 20.4–26.4 V DC, which is the standard AS-i bus voltage range. ## Panel fit and mounting flexibility The enclosure measures 205 mm deep, 245 mm wide, and 215 mm high — the depth is the dimension that matters most when the panel depth is tight against a backplate or gland plate. IP54 means it handles dust and splashing water in a cabinet environment, but not washdown. ## Integrated brake output and short-circuit protection This unit includes a motor brake output (400 V AC) — the brake coil is switched directly from the starter, saving a separate contactor for the brake on a hoist or conveyor application. Short-circuit protection is designed for use with circuit-breakers, not fuses, so coordinate the upstream breaker to the starter's let-through. The starter is a direct starter design with electromechanical switching contacts, and it has 2 digital inputs for local control or feedback. ## Current production — quoted to order Sourced through authorized distribution channels.","metaTitle":"Siemens 3RK4320-3BQ54-0BA3 SIRIUS Motor Starter, 0.8 A AC-3","metaDescription":"Siemens 3RK4320-3BQ54-0BA3 SIRIUS MCU motor starter, 0.8 A at 400 V AC-3, CLASS 10 trip, AS-Interface, IP54. Current production, quoted 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":"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":"Yes","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","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":"0.55 ... 0.8 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/876cac42a2cd2138f8fdc4fee98c5723.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=9254&mlfb=3RK4320-3BQ54-0BA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3BQ54-0BA3/alternatives.json"},"ai":{"faq":[{"question":"What does the CLASS 10 trip rating mean for motor protection?","answer":"This protects standard induction motors during a locked-rotor condition without tripping on a normal acceleration start."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3BQ54-0BA3","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/3RK4320-3BQ54-0BA3 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}}