{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3JQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3JQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3JQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3JQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3JQ51-1BA2, reversing motor starter with integrated brake control, 4 A rated operational current at AC-3 400 V, AS-Interface communication, CLASS 10 bimetal overload protection, IP54 enclosure.","salesMarkdown":"Rated 4 A at AC-3 400 V, it handles reversing duty for small motors up to that current — think conveyor direction changes or pump valve positioning. This is a current-production part (lifecycle stage: current). It ships with AS-Interface onboard — no add-on gateway needed — and carries a brake control output for holding brakes typical on vertical-axis loads. The IP54 enclosure suits it for panel-mount in industrial environments where dust and splash are present, but not for direct washdown zones. The 4 A AC-3 rating at 400 V governs the motor it can switch: that's the full-load current of a roughly 2.2 kW / 3 hp induction motor on a 400 V three-phase line. The control supply is 20.4 to 26.4 V DC, so it runs off a standard 24 V DC control bus. The main power circuit operates on 340 to 440 V AC at 50 or 60 Hz — covers the usual 400 V three-phase industrial supply with tolerance for sag. The 80 operations per hour maximum frequency means it is sized for occasional reversing cycles, not high-speed jogging. The 245 mm width × 205 mm depth × 215 mm height footprint means it occupies a substantial slice of backplane; plan the gland plate and wireway accordingly. Two digital inputs are onboard for local control or feedback. AS-Interface is the only fieldbus onboard — no PROFIBUS or PROFINET variant here. If the line runs on PROFINET, this unit needs a gateway or a different SIRIUS variant. The brake output is for 24 V DC holding brakes, not 180 V DC or 400 V AC brake types, so verify the brake coil voltage before specifying.","metaTitle":"Siemens 3RK4320-3JQ51-1BA2 SIRIUS Motor Starter, 4 A AC-3","metaDescription":"Siemens SIRIUS 3RK4320-3JQ51-1BA2 reversing motor starter with brake output, 4 A at AC-3 400 V, AS-Interface, CLASS 10, IP54.","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":"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":"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":"4 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":"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":"2.8 ... 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=193074&mlfb=3RK4320-3JQ51-1BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3JQ51-1BA2/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RK4320-3JQ51-1BA2 available via RFQ confirmation?","answer":"This part is sourced to order; availability and pricing are confirmed at quote time. Contact our sales team for current lead time and pricing."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3JQ51-1BA2","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/3RK4320-3JQ51-1BA2 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}}