{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4320-3KQ51-1BA2","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4320-3KQ51-1BA2","canonicalUrl":"https://aoctrl.com/siemens/3RK4320-3KQ51-1BA2","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3KQ51-1BA2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4320-3KQ51-1BA2 reversing motor starter, AS-Interface bus communication, 5 A at 400 V AC-3, CLASS 10 bimetal overload, IP54, 205 x 245 x 215 mm.","salesMarkdown":"## Reversing starter with AS-Interface bus The Siemens 3RK4320-3KQ51-1BA2 is a SIRIUS reversing motor starter designed for AS-Interface bus communication. It integrates a bimetal motor protection relay with CLASS 10 trip characteristic, electromechanical switching contacts, and short-circuit protection via circuit-breakers — all in a single enclosure rated IP54. ## Rated current and motor duty Rated 5 A at 400 V in both AC-3 (motor starting) and AC-4 (reversing/inching) duty classes — the same current ceiling applies across both operating modes, so the reversing function doesn't force a derating step. The operating voltage range is 340 to 440 V at 50/60 Hz. The ambient temperature operating range is -25 to +50 °C. ## DC control supply and AS-Interface integration Control supply voltage is 20.4 to 26.4 V DC — the same rail that powers the AS-Interface bus. Two digital inputs are available for local switching commands. The unit supports AS-Interface protocol natively; PROFIBUS DP and PROFINET are not implemented on this variant.","metaTitle":"Siemens 3RK4320-3KQ51-1BA2 SIRIUS Motor Starter, 5 A","metaDescription":"Siemens 3RK4320-3KQ51-1BA2 SIRIUS reversing motor starter for AS-Interface. Rated 5 A at 400 V AC-3, 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":"reversing starter","Number Of Digital Inputs":"2","Short Circuit Protection":"Yes","at AC at 400 V rated value":"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":"5 A","Operating Voltage Rated Value":"340 ... 440 V","Substance Prohibitance (Date)":"01.05.2012","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","reference code acc. to IEC 81346-2":"Q","Ambient Temperature During Operation":"-25 ... +50 °C","Product Component Motor Brake Output":"Yes","Type Of Voltage Of The Supply Voltage":"DC","with low demand rate acc. to SN 31920":"50 %","with high demand rate acc. to SN 31920":"75 %","Number Of Poles For Main Current Circuit":"3","control supply voltage at DC rated value":"20.4 ... 26.4 V","protocol is supported AS-Interface protocol":"Yes","operating power at AC-3 at 400 V rated value":"1.5 kW","B10 value with high demand rate acc. to SN 31920":"1 000 000","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":"3.5 ... 5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/39d22010b982d08054d000552874111f.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=106366&mlfb=3RK4320-3KQ51-1BA2","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4320-3KQ51-1BA2/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4320-3KQ51-1BA2","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/3RK4320-3KQ51-1BA2 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}}