{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3NQ51-1BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3NQ51-1BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-1BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3NQ51-1BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3NQ51-1BA3 reversing motor starter, 10 A AC-3 at 400 V, Class 10, AS-Interface, IP54, 205×245×215 mm.","salesMarkdown":"## AS-Interface reversing starter with integrated brake control The 3RK4320-3NQ51-1BA3: That AC-3 rating means it switches squirrel-cage motors up to that current — the typical load for reversing starters on conveyors, hoists, and gate drives where direction change is part of the cycle. It carries a Class 10 trip characteristic via a bimetal overload relay, so it clears a stalled-rotor condition within 10 seconds at 600% of the set current — standard protection for standard induction motors. The 3-pole main circuit handles the motor leads; the integrated motor brake output (400 V AC) means you don't need a separate brake contactor for motors with AC brakes. The operating voltage range is 340 to 440 V AC at 50 or 60 Hz — it covers 400 V nominal supplies with tolerance, but won't run on 480 V systems without a step-down transformer. The control supply is 20.4 to 26.4 V DC, so it needs a 24 V DC bus from the AS-Interface power supply or a separate PELV source. Two digital inputs are onboard for local start/stop or direction commands, supplementing the AS-Interface control word. The ambient operating range is -25 to +50 °C — fine for most indoor panels but tight for a hot motor control centre above 50 °C; derating applies above that ceiling. Mounting is flexible: the unit can be rotated ±180° on a vertical surface and tilted ±22.5° forward or backward. That helps when you're fitting it into a tight enclosure corner or aligning the AS-Interface cable entry. IP54 means it's protected against dust ingress and splashing water — suitable for dry factory-floor cabinets but not washdown zones. ## Sourcing and lifecycle — current production, quoted to order The footprint is 205 mm deep by 245 mm wide by 215 mm high — verify the panel cut-out and clearance for the AS-Interface bus connector before committing. No direct second-source or cross-reference to the listed alternate MPNs (6ES7517-3FP00-0AB0, 6AG1215-1BG40-5XB0, 6ES7214-1BG40-0XB0) exists; those are Siemens PLC CPUs, not motor starters, so a panel designed around them won't accept this unit without a full rewire and bus reconfiguration.","metaTitle":"Siemens 3RK4320-3NQ51-1BA3 SIRIUS Motor Starter, 10 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3NQ51-1BA3 reversing motor starter, 10 A at 400 V AC-3, Class 10, 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","title":"3RK4320-3NQ51-1BA3","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 Reversing 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":"reversing 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/3a746ba201ccf9c9337666d082afad7e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=208137&mlfb=3RK4320-3NQ51-1BA3"},"ai":{"faq":[{"question":"How can I order 3RK4320-3NQ51-1BA3 and get a quote?","answer":"Submit an RFQ with your target quantity. We source this through authorized industrial distribution channels and confirm lead time and volume pricing at quote time. No stock-holding claim is made; availability is confirmed per inquiry."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3NQ51-1BA3","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/3RK4320-3NQ51-1BA3 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}}