{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3CQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3CQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3CQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3CQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3CQ51-1BA2 reversing motor starter, 1 A AC-3 at 400 V, Class 10, AS-Interface, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## SIRIUS reversing starter with AS-Interface This is a Siemens SIRIUS 3RK4320-3CQ51-1BA2 reversing motor starter — a compact, electromechanical unit that integrates motor protection, reversing contactors, and AS-Interface bus communication into a single enclosure. ## AS-Interface integration and I/O The starter communicates via AS-Interface protocol — no PROFIBUS or PROFINET on this variant, so the bus master must be AS-i compatible. Two digital inputs are onboard for local feedback or auxiliary signals, and the unit includes a motor brake output (24 V DC brake control is not fitted, but the component is present for other brake voltages). Short-circuit protection is provided by circuit-breakers integrated into the design, and the unit is rated for up to 80 operating cycles per hour. ## Mounting and environmental limits Enclosure measures 205 mm deep, 245 mm wide, and 215 mm tall, with IP54 protection — suitable for indoor industrial environments where dust and splash are present but not washdown. ## Lifecycle and compliance Substance prohibitance date is May 1, 2012, indicating RoHS compliance per Siemens' internal substance control policy. Reference code per IEC 81346-2 is Q (switching device), and the product is designed for 1:1 assignment (one motor per starter).","metaTitle":"Siemens 3RK4320-3CQ51-1BA2 SIRIUS Motor Starter, 1 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3CQ51-1BA2 reversing motor starter, 1 A at 400 V AC-3, Class 10, AS-Interface, IP54. Active 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":"reversing starter","Number Of Digital Inputs":"2","Short Circuit Protection":"Yes","at AC at 400 V rated value":"1 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":"1 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":"0.3 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":"0.7 ... 1 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9a731f6b471b2fbfa493c4e164421274.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=325972&mlfb=3RK4320-3CQ51-1BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3CQ51-1BA2/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3CQ51-1BA2","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/3RK4320-3CQ51-1BA2 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}}