{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3PQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3PQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3PQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3PQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3PQ51-1BA2 reversing motor starter, AS-Interface, 12 A AC-3 at 400 V, CLASS 10, IP54, 205 mm depth.","salesMarkdown":"## AS-Interface reversing starter for motor control The Siemens 3RK4320-3PQ51-1BA2 is a SIRIUS reversing motor starter designed for AS-Interface networks, combining a contactor, overload relay, and communication interface in one enclosure. The AS-Interface protocol is supported, with 2 digital inputs for local control signals, and the control supply is 20.4–26.4 V DC. ## Panel fit and mounting flexibility Dimensions are 205 mm depth, 245 mm width, and 215 mm height — the depth is the critical clearance behind the panel door for wiring and heat dissipation. IP54 rating means the unit is protected against dust ingress and splashing water — suitable for installation in control cabinets on factory floors where occasional washdown occurs. ## Motor protection and brake output A motor brake output is built into the product, allowing direct control of a holding brake without an external relay — saves panel space and wiring. Short-circuit protection is integrated via circuit-breakers, and the operating frequency is rated for 80 operations per hour at 50/60 Hz.","metaTitle":"Siemens 3RK4320-3PQ51-1BA2 SIRIUS Motor Starter, 12 A","metaDescription":"Siemens 3RK4320-3PQ51-1BA2 SIRIUS reversing motor starter, 12 A AC-3 at 400 V, AS-Interface, IP54. Active production, quoted to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","title":"3RK4320-3PQ51-1BA2","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 230 V AC (internal) Performance class 12.00 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":"12 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":"12 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":"5.5 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":"9 ... 12.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/94e4c1eb4a339b75381ec32dbac77784.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=80896&mlfb=3RK4320-3PQ51-1BA2"},"ai":{"faq":[{"question":"How do I get pricing and availability for 3RK4320-3PQ51-1BA2?","answer":"Submit an RFQ against your BOM quantity."},{"question":"What are the key ratings for this motor starter?","answer":"Dimensions: 205 mm depth, 245 mm width, 215 mm height."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3PQ51-1BA2","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/3RK4320-3PQ51-1BA2 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}}