{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3NQ51-0BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3NQ51-0BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-0BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3NQ51-0BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3NQ51-0BA3 motor starter MCU, direct starter, AS-Interface bus, 10 A AC-3 at 400 V, Trip Class 10, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## SIRIUS MCU direct starter with AS-Interface — 10 A AC-3 at 400 V The 3RK4320-3NQ51-0BA3: It communicates over AS-Interface (AS-i) without needing a separate bus coupler or gateway module — the protocol support is onboard, and the 24 V DC control supply (20.4 to 26.4 V) is drawn from the AS-i yellow cable, simplifying the control cabinet wiring for a distributed motor starter cluster. Two digital inputs are integrated into the unit, so local feedback from auxiliary contacts or pushbuttons can be read directly without pulling additional I/O drops on the AS-i bus. ## Brake control and mounting flexibility A motor brake output is built in, switching 400 V AC directly — this saves an external brake contactor and its associated wiring in applications like hoists, conveyors, or machine axes that need a holding brake. The unit mounts on a vertical surface with ±180° rotation possible, and can be tilted forward or backward by ±22.5° — useful when fitting into tight panel layouts or orienting the display and bus connectors for service access. IP54 protection means it is dust-protected and splash-resistant, suitable for indoor control panels in industrial environments — not rated for washdown or outdoor exposure. The ambient operating range of -25 to +50 °C covers unheated plant floors and cabinet interiors near warm machinery without derating at the upper end. ## Lifecycle and sourcing — current production RoHS compliance is confirmed with a substance prohibitance date of May 1, 2012 — the unit is fully RoHS-compliant for EU markets.","metaTitle":"Siemens 3RK4320-3NQ51-0BA3 SIRIUS Motor Starter, 10 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3NQ51-0BA3 motor starter, 10 A at 400 V AC-3, AS-Interface bus, IP54, current production. Sourced 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","title":"3RK4320-3NQ51-0BA3","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 400 V AC (internal) Performance class 10.00 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":"10 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":"10 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":"4 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":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/edcf620489994fa4c665ada7ea133cf6.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=478046&mlfb=3RK4320-3NQ51-0BA3"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-0BA3","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/3RK4320-3NQ51-0BA3 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}}