{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3DR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3DR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3DR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3DR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU, I/O controlled, direct starter, 1.25 A AC-3 at 400 V, CLASS 10, IP55, 3RK4340-3DR51-0BA0.","salesMarkdown":"The bimetal overload trips to CLASS 10, so it protects motors with normal acceleration times (up to 10 seconds at locked-rotor current). Control supply is 20.4 to 26.4 V DC, and the operating voltage range is 340 to 440 V AC, 50/60 Hz. This starter has no digital inputs onboard (: 0) and no fieldbus interface — no PROFINET, no PROFIBUS, no AS-Interface. It is a pure I/O-controlled unit: the 20.4–26.4 V DC control supply drives the coil directly from a PLC digital output or a relay. For a line that needs bus-based diagnostics or remote reset, you would step up to a SIRIUS variant with the communication module. For simple on/off control with local overload protection, this keeps the wiring clean.","metaTitle":"Siemens 3RK4340-3DR51-0BA0 SIRIUS Motor Starter, 1.25 A AC-3","metaDescription":"Siemens 3RK4340-3DR51-0BA0 SIRIUS motor starter MCU, I/O controlled, direct starter, 1.25 A AC-3 at 400 V, CLASS 10, IP55. Current production. 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","Height":"220 mm","Trip Class":"CLASS 10","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":"1.25 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":"1.25 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":"0.4 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":"0.9 ... 1.25 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=14646&mlfb=3RK4340-3DR51-0BA0","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3DR51-0BA0/alternatives.json"},"ai":{"faq":[{"question":"Is 3RK4340-3DR51-0BA0 a direct starter or reversing starter?","answer":"It is a direct starter — a single direction, non-reversing motor starter."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4340-3DR51-0BA0","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/3RK4340-3DR51-0BA0 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}}