{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3LQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3LQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3LQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3LQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3LQ51-1BA2 reversing motor starter, 6.3 A at 400 V AC-3, CLASS 10 trip, AS-Interface, 2 digital inputs, IP54, 205×245×215 mm.","salesMarkdown":"## Motor-starting duty and trip class The 3RK4320-3LQ51-1BA2: Rated operating frequency is 80 operations per hour maximum, with a 50% duty cycle at low demand rate and 75% at high demand rate per SN 31920. That sets the thermal budget for the reversing contactor pair inside the enclosure. ## AS-Interface integration and I/O This motor starter communicates over AS-Interface — the AS-i protocol is supported natively, with no PROFIBUS DP or PROFINET on this variant. Two digital inputs are available on the unit for local sensors or limit switches, reducing the need for a separate I/O block at the motor. Control supply is 20.4–26.4 V DC, drawn from the AS-i yellow cable or an external 24 V DC source. ## Mounting, enclosure, and panel fit Dimensions are 205 mm deep, 245 mm wide, and 215 mm high. The unit mounts on a vertical surface with ±180° rotation possible, and can be tilted forward or backward by ±22.5° — useful when routing cables in a crowded panel. IP54 protection means the enclosure is dust-protected and splash-proof from any direction — suitable for installation inside a cabinet or in a dry, non-washdown area on the machine frame. ## Lifecycle and sourcing posture Short-circuit protection is provided by upstream circuit-breakers; the starter itself includes electromechanical switching contacts with bimetal overload protection. No brake control outputs are fitted on this variant.","metaTitle":"Siemens 3RK4320-3LQ51-1BA2 SIRIUS motor starter, 6.3 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3LQ51-1BA2 reversing motor starter, 6.3 A at 400 V AC-3, CLASS 10, AS-Interface, 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","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":"reversing 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9665d34bfae98da1c48c5cdc94adea9e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=90298&mlfb=3RK4320-3LQ51-1BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3LQ51-1BA2/alternatives.json"},"ai":{"faq":[{"question":"What is the AC-3 rated current of 3RK4320-3LQ51-1BA2?","answer":"6.3 A at 400 V AC-3, with a CLASS 10 bimetal overload relay. This covers motor starting duty for small reversing applications up to that current."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3LQ51-1BA2","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/3RK4320-3LQ51-1BA2 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}}