{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3PQ54-0BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3PQ54-0BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3PQ54-0BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3PQ54-0BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU for AS-Interface, 3RK4320-3PQ54-0BA2, direct starter, 12 A AC-3 at 400 V, CLASS 10, IP54, 3-pole, 2 digital inputs, bimetal motor protection.","salesMarkdown":"## AS-Interface integration and power The unit communicates on AS-Interface, with no PROFIBUS DP or PROFINET. It has 2 digital inputs, control supply 20.4 to 26.4 V DC, main circuit 340 to 440 V AC, 50/60 Hz. Dimensions are 205 mm deep, 245 mm wide, and 215 mm high — a compact footprint for a combined starter and bus node. ## Motor protection and braking Motor protection is via a bimetal thermal overload relay, with short-circuit protection provided by upstream circuit breakers (the unit itself has integrated short-circuit protection, but the design specifies circuit-breakers as the external short-circuit protection device). The unit includes a motor brake output component, though it does not support brake control at 24 V DC, 180 V DC, 400 V AC, or 500 V DC — so if you need integrated brake control, this variant is not the one; you would look at a 3RK43xx with brake control enabled. The switching contact is electromechanical, not solid-state, so expect mechanical life limits. The minimum operating frequency is 80 operations per hour, which is fine for most cyclic loads but not for high-speed indexing applications.","metaTitle":"Siemens 3RK4320-3PQ54-0BA2 SIRIUS Motor Starter, 12 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3PQ54-0BA2 motor starter MCU for AS-Interface, 12 A AC-3 at 400 V, CLASS 10, IP54. Current production. Sourced to order against RFQ.","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":"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","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":"9 ... 12.5 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=97559&mlfb=3RK4320-3PQ54-0BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3PQ54-0BA2/alternatives.json"},"ai":{"faq":[{"question":"Is 3RK4320-3PQ54-0BA2 compatible with AS-Interface?","answer":"Yes, the AS-Interface protocol is supported. It does not support PROFIBUS DP or PROFINET."},{"question":"Does 3RK4320-3PQ54-0BA2 require a separate circuit breaker?","answer":"The unit has integrated short-circuit protection, but the design specifies circuit-breakers as the external short-circuit protection device. A separate circuit breaker upstream is recommended."},{"question":"What is the equivalent for 3RK4320-3PQ54-0BA2?","answer":"There is no direct second-source equivalent from other manufacturers. Within the Siemens SIRIUS family, the closest functional alternative would be a 3RK43xx variant with brake control if that feature is needed, but for a direct AS-Interface motor starter at 12 A AC-3, this is the standard catalog part."},{"question":"Where can I buy 3RK4320-3PQ54-0BA2?","answer":"This part is sourced to order against RFQ. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3PQ54-0BA2","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/3RK4320-3PQ54-0BA2 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}}