{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3DQ51-1BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3DQ51-1BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3DQ51-1BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3DQ51-1BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3DQ51-1BA3 reversing motor starter MCU for AS-Interface, 1.25 A at AC-3/400 V, 340-440 V operating voltage, 50/60 Hz, IP54, Class 10 bimetal overload, 205 x 245 x 215 mm.","salesMarkdown":"## SIRIUS reversing starter for AS-Interface — form factor and fit The 3RK4320-3DQ51-1BA3: It carries a rated current of 1.25 A at AC-3/400 V and operates on a 340-440 V supply at 50 or 60 Hz. The enclosure measures 205 mm deep by 245 mm wide by 215 mm high, with IP54 ingress protection — suitable for panel environments where dust and splash are present. ## Motor protection and control — Class 10 bimetal overload The short-circuit protection is designed for circuit-breakers, and the switching contacts are electromechanical. Control supply is 20.4-26.4 V DC, and the starter includes a motor brake output with 400 V AC brake control. Two digital inputs are available for local control signals, and the unit supports AS-Interface protocol for fieldbus communication. The unit is rated for both low demand rate (50%) and high demand rate (75%) per SN 31920, indicating suitability for safety-related applications with defined proof-test intervals.","metaTitle":"Siemens 3RK4320-3DQ51-1BA3 SIRIUS Motor Starter, 1.25 A","metaDescription":"Siemens SIRIUS 3RK4320-3DQ51-1BA3 reversing motor starter, 1.25 A at AC-3/400 V, IP54, AS-Interface, 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":"3RK4320-3DQ51-1BA3","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 1.25 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":"1.25 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":"1.25 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":"0.4 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":"0.9 ... 1.25 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0ea75788c72505255d2b606250236b60.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=409787&mlfb=3RK4320-3DQ51-1BA3"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3DQ51-1BA3","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/3RK4320-3DQ51-1BA3 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}}