{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3PR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3PR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3PR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3PR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU, I/O controlled, direct starter, 12 A at AC-3 400 V, CLASS 10, IP55, 20.4-26.4 V DC control, 3RK4340-3PR51-0BA0.","salesMarkdown":"Rated operating voltage is 340 to 440 V, 50/60 Hz, and the control supply is 20.4 to 26.4 V DC. The IP55 enclosure handles dust and water jets. AC-3 covers starting and plugging of squirrel-cage motors, which is the typical duty for conveyors, pumps, and fans. The control supply range (20.4 to 26.4 V DC) is the coil holding voltage — it drops out below that threshold. ## Where this class of part is used Motor starters in this class are used in industrial control panels to switch and protect three-phase motors in applications like material handling, packaging lines, HVAC, and process pumps. The direct-starter design means the motor runs at full speed when the contactor is closed — no soft-start or reversing. The I/O-controlled variant accepts commands from a PLC or control system via the DC control input.","metaTitle":"Siemens 3RK4340-3PR51-0BA0 SIRIUS MCU, 12 A AC-3, CLASS 10","metaDescription":"Siemens SIRIUS 3RK4340-3PR51-0BA0 motor starter MCU, direct starter, 12 A at AC-3 400 V, CLASS 10, IP55, 20.4-26.4 V DC control. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","title":"3RK4340-3PR51-0BA0","Height":"220 mm","Trip Class":"CLASS 10","description":"SIRIUS MCU motor starter Enclosure degree of protection IP55 plastic Communication without electromechanically switching Short-circuit protection with circuit breaker DOL starter Brake without Performance class 12.00 A Motor circuit breaker with bi-metal thermal Manual operation without Connection power M screw connection Standard product","Type Of Voltage":"DC","lifecycle_stage":"current","Bus Communication":"No","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, I/O controlled","protection class IP":"IP55","PROFIBUS DP protocol":"No","Design Of The Product":"direct starter","Number Of Digital Inputs":"0","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 ... +35 °C","Product Component Motor Brake Output":"No","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":"No","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,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/461fa51498056a0c42199ee601191971.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=120016&mlfb=3RK4340-3PR51-0BA0"},"ai":{"faq":[{"question":"What is the difference between SIRIUS MCU and M200D?","answer":"The SIRIUS MCU (Motor Control Unit) is a compact direct-starter block with integrated overload and short-circuit protection, while the M200D is a motor starter with integrated fieldbus communication. The 3RK4340-3PR51-0BA0 is an I/O-controlled MCU without bus communication, making it a simpler, lower-cost option for hardwired control panels."},{"question":"Where can I buy 3RK4340-3PR51-0BA0?","answer":"This part is sourced to order. Availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4340-3PR51-0BA0","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/3RK4340-3PR51-0BA0 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}