{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3GQ51-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3GQ51-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3GQ51-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3GQ51-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS MCU motor starter 3RK4320-3GQ51-0BA2, direct starter design for AS-Interface, rated 2.5 A at AC-3 400 V, Trip Class 10, DC control supply 20.4...26.4 V, IP54.","salesMarkdown":"The Siemens 3RK4320-3GQ51-0BA2 is a SIRIUS MCU motor starter, a compact direct-starter design with integrated AS-Interface communication for distributed motor control in automation cells. It is rated 2.5 A at AC-3 400 V, Trip Class 10, meaning it is sized for switching and protecting small three-phase induction motors (up to roughly 0.75 kW at 400 V) under moderate starting duty — the CLASS 10 trip curve clears overloads within 10 seconds at 7.2× rated current, typical for standard conveyor and pump applications. The control supply is 20.4...26.4 V DC, and the operating voltage on the main circuit is 340...440 V at 50/60 Hz. ## AS-Interface integration and I/O This motor starter communicates via AS-Interface protocol (no PROFIBUS DP or PROFINET onboard — the AS-i bus handles the control and feedback). It provides 2 digital inputs for local sensors or limit switches, and includes a motor brake output as a product component. ## Protection and environment Motor protection is bimetal-based (thermal overload), with short-circuit protection handled by an upstream circuit-breaker (not integrated). The enclosure is rated IP54, so it is suitable for installation in control cabinets where dust and splash ingress is expected, but not for washdown zones.","metaTitle":"Siemens 3RK4320-3GQ51-0BA2 SIRIUS MCU Motor Starter","metaDescription":"Siemens SIRIUS 3RK4320-3GQ51-0BA2 motor starter MCU for AS-Interface. Current production. Rated 2.5 A at AC-3 400 V, Trip Class 10.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"245 mm","Height":"215 mm","Trip Class":"CLASS 10","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":"2.5 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":"2.5 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":"0.8 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":"1.8 ... 2.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=201630&mlfb=3RK4320-3GQ51-0BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3GQ51-0BA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RK4320-3GQ51-0BA2?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm availability and current pricing at the time of your order."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3GQ51-0BA2","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/3RK4320-3GQ51-0BA2 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}