{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3CQ54-0BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3CQ54-0BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3CQ54-0BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3CQ54-0BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS MCU motor starter, direct starter, 3RK4320-3CQ54-0BA3, 1 A AC-3 at 400 V, CLASS 10, AS-Interface, IP54.","salesMarkdown":"## What the 1 A AC-3 rating means for your motor branch Its headline rating is 1 A at AC-3, 400 V — that is the motor-switching current, not the resistive-heating current. AC-3 duty covers starting and disconnecting squirrel-cage motors under full load, so this unit is sized for small motor branches up to that current. ## AS-Interface integration and control supply This MCU communicates natively over AS-Interface — the protocol is supported on-board, so no external gateway module is needed for the fieldbus link. The control supply is 20.4... 26.4 V DC, which matches the standard AS-Interface power supply voltage. Two digital inputs are integrated into the unit, allowing local sensor signals to be read directly without a separate I/O block. The operating voltage for the main motor circuit is 340... 440 V AC at 50 or 60 Hz. ## Environmental and physical fit IP54 protection means the unit is dust-protected and splash-proof — suitable for installation in control cabinets on the plant floor where occasional dust or water spray is present, but not for direct washdown zones. Dimensions are 205 mm deep, 245 mm wide, and 215 mm high. The brake control output is rated for 400 V AC, allowing direct switching of an AC motor brake without an external contactor.","metaTitle":"Siemens 3RK4320-3CQ54-0BA3 SIRIUS MCU, 1 A AC-3, CLASS 10","metaDescription":"Siemens 3RK4320-3CQ54-0BA3 SIRIUS motor starter MCU for AS-Interface. Rated 1 A at AC-3, 400 V. CLASS 10 trip. IP54. Active 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","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":"1 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 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":"0.3 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":"0.7 ... 1 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=45836&mlfb=3RK4320-3CQ54-0BA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3CQ54-0BA3/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy Siemens 3RK4320-3CQ54-0BA3?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote to confirm current availability and pricing."},{"question":"What is the rated current of 3RK4320-3CQ54-0BA3?","answer":"The motor-switching current rating is 1 A at AC-3, 400 V. The resistive (AC-1) rating at 400 V is also 1 A. This is a CLASS 10 thermal overload protection device."},{"question":"Does 3RK4320-3CQ54-0BA3 support AS-Interface?","answer":"Yes, the AS-Interface protocol is supported natively on this MCU. No external gateway is required for AS-i network communication."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3CQ54-0BA3","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/3RK4320-3CQ54-0BA3 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}}