{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3LQ51-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3LQ51-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3LQ51-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3LQ51-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3LQ51-0BA2 motor starter, direct starter, 6.3 A at 400 V AC-3, CLASS 10, IP54, AS-Interface bus communication, 3-pole, DC control supply.","salesMarkdown":"## Motor starter for AS-Interface lines — what fits in the panel The 3RK4320-3LQ51-0BA2: CLASS 10 trip means it will clear a stalled rotor before the winding insulation cooks, which matters for conveyors and pumps that can jam. It communicates over AS-Interface (not PROFINET or PROFIBUS DP), so this goes on an AS-i network segment. Two digital inputs are built in, and there's a motor brake output (24 V DC) available — handy for holding brakes on vertical-axis drives without a separate contactor. IP54 enclosure means it handles dust and splashing water — fine for a machine-side cabinet but not washdown zones. ## Mounting and panel fit — the numbers that matter Dimensions: 245 mm wide by 215 mm high by 205 mm deep. That's a substantial footprint — it won't squeeze into a shallow junction box. That helps when the back panel is already crowded. The short-circuit protection is designed for circuit-breakers upstream — not fuses — so coordinate the branch circuit protection accordingly. Rated operating frequency is 80 operations per hour minimum, which is fine for intermittent starting duty but not for rapid cycling. If the panel runs hot near the top, derate or relocate. The unit is a direct starter with electromechanical contacts — no solid-state switching here, so coil buzz and contact wear are part of the maintenance cycle.","metaTitle":"Siemens 3RK4320-3LQ51-0BA2 SIRIUS Motor Starter, 6.3 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3LQ51-0BA2 motor starter, direct starter design, 6.3 A at 400 V AC-3, CLASS 10 trip, IP54, AS-Interface bus communication.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3LQ51-0BA2","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 6.30 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":"6.3 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":"6.3 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":"2.2 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":"4.5 ... 6.3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6b3af586df12bb77809ba3b5aaebf5be.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=325953&mlfb=3RK4320-3LQ51-0BA2"},"ai":{"faq":[{"question":"What are the key ratings for 3RK4320-3LQ51-0BA2?","answer":"Dimensions: 245 mm wide, 215 mm high, 205 mm deep."},{"question":"Can I buy 3RK4320-3LQ51-0BA2 here and how is it quoted?","answer":"No stock-holding claim; it's a procurement inquiry, not a shelf-pick."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3LQ51-0BA2","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/3RK4320-3LQ51-0BA2 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}}