{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-5JQ61-1BA3","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-5JQ61-1BA3","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-5JQ61-1BA3","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-5JQ61-1BA3","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS MCU reversing motor starter, 3RK4320-5JQ61-1BA3, 4 A rated at AC-3 400 V, CLASS 10 solid-state overload, AS-Interface bus, integrated 400 V AC brake control, 24 VDC control supply, IP54.","salesMarkdown":"The Siemens 3RK4320-5JQ61-1BA3 is a SIRIUS MCU reversing motor starter designed for AS-Interface bus communication — it handles direction reversal and motor protection in a single enclosure, saving panel space over a contactor-plus-overload-plus-reversing-contactor stack. The 24 VDC control supply (20.4…26.4 V range) powers the onboard electronics and the AS-Interface transceiver, so the panel needs a regulated DC bus — not a raw rectified supply. ## Brake control and I/O — what is actually onboard This reversing starter includes a motor brake output rated for 400 V AC — the evidence confirms brake control at 400 V AC is present, while DC brake variants (24 V, 180 V, 500 V) are not. That means the unit directly drives an AC-fed holding brake without an external contactor, but if your motor has a DC brake rectifier you need a different variant. Two digital inputs are integrated for local start/stop or reset signals, reducing the need for separate I/O blocks. The main current circuit is three-pole, and short-circuit protection is designed for use with upstream circuit-breakers.","metaTitle":"Siemens 3RK4320-5JQ61-1BA3 SIRIUS MCU Reversing Starter","metaDescription":"Siemens 3RK4320-5JQ61-1BA3 SIRIUS MCU reversing motor starter for AS-Interface. 4 A at AC-3 400 V, CLASS 10 solid-state overload, integrated brake output.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"205 mm","Width":"290 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":"reversing starter","Number Of Digital Inputs":"2","Short Circuit Protection":"Yes","at AC at 400 V rated value":"4 A","brake control with 24 V DC":"No","Operating Frequency Minimum":"3 600 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":"solid-state","at AC-3 at 400 V rated value":"4 A","Operating Voltage Rated Value":"340 ... 460 V","Substance Prohibitance (Date)":"05/01/2012","Design Of The Switching Contact":"solid-state","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":"1.5 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":"1 ... 4 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=71553&mlfb=3RK4320-5JQ61-1BA3","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-5JQ61-1BA3/alternatives.json"},"ai":{"faq":[{"question":"Does the 3RK4320-5JQ61-1BA3 support reversing?","answer":"Yes, the 3RK4320-5JQ61-1BA3 is a reversing starter — it switches motor direction without external reversing contactors."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-5JQ61-1BA3","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/3RK4320-5JQ61-1BA3 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}}