{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3AR51-1BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3AR51-1BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3AR51-1BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3AR51-1BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3AR51-1BA0, reversing motor starter for AS-Interface, 0.63 A AC-3 at 400 V, IP55, Trip Class 10, 145 x 182 x 220 mm.","salesMarkdown":"It is designed for AS-Interface bus communication, so it fits into a networked automation cell where the reversing logic and motor protection are handled over the AS-i loop rather than hardwired. Rated current is 0.63 A in AC-3 duty at 400 V, so it is sized for a small motor, roughly 0.25 kW at 400 V three-phase. Supply voltage for the control electronics is 20.4 to 26.4 V DC, drawn from the AS-Interface network or an external DC source. Enclosure rating is IP55, so it handles dust and water jets — suitable for installation in a washdown area or a non-hosed machine cabinet, but not submersion. The unit measures 145 mm deep, 182 mm wide, and 220 mm high. The IP55 rating means it can be mounted on the machine frame, not just inside a sealed cabinet, as long as the ambient stays between -25 and +35 °C. Communication is exclusively AS-Interface — no PROFIBUS or PROFINET onboard. That is the deciding factor for BOM fit: if your line controller speaks AS-i, this starter drops in with one bus cable for both control and feedback. If your control layer is PROFINET, you need a gateway or a different SIRIUS variant. Genuine is genuine — same part, different passport — and the AS-Interface address configuration is set via the bus master, not DIP switches on the unit.","metaTitle":"Siemens 3RK4320-3AR51-1BA0 SIRIUS Reversing Starter, 0.63 A","metaDescription":"Siemens SIRIUS 3RK4320-3AR51-1BA0 reversing motor starter for AS-Interface. Rated 0.63 A AC-3 at 400 V, IP55, Trip Class 10. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","title":"3RK4320-3AR51-1BA0","Height":"220 mm","Trip Class":"CLASS 10","description":"SIRIUS MCU motor starter Enclosure degree of protection IP55 plastic Communication AS-Interface electromechanically switching Short-circuit protection with circuit breaker Reversing starter Brake without Performance class 0.63 A Motor circuit breaker with bi-metal thermal Manual operation without 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":"IP55","PROFIBUS DP protocol":"No","Design Of The Product":"reversing starter","Number Of Digital Inputs":"0","Short Circuit Protection":"Yes","at AC at 400 V rated value":"0.63 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":"0.63 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 ... +35 °C","Product Component Motor Brake Output":"No","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":"0.2 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":"0.45 ... 0.63 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/892f73cb9a688eb399e3f061081e5b9f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=447708&mlfb=3RK4320-3AR51-1BA0"},"ai":{"faq":[{"question":"Is 3RK4320-3AR51-1BA0 a reversing starter?","answer":"Yes, the Siemens 3RK4320-3AR51-1BA0 is a reversing starter. Its product design is explicitly a reversing starter, meaning it integrates two contactors with mechanical interlock in one housing to reverse a three-phase motor without external wiring."},{"question":"What communication protocol does 3RK4320-3AR51-1BA0 support?","answer":"The 3RK4320-3AR51-1BA0 supports AS-Interface protocol. It does not support PROFIBUS DP or PROFINET. The AS-i connection carries both control commands and status feedback over a single two-wire cable."},{"question":"What is the IP rating of 3RK4320-3AR51-1BA0?","answer":"The protection class is IP55. That means the enclosure is dust-protected and protected against water jets from any direction — suitable for washdown areas and outdoor cabinets not subject to flooding."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3AR51-1BA0","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/3RK4320-3AR51-1BA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}