{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3NR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3NR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3NR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3NR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4340-3NR51-0BA0, motor starter MCU, I/O controlled, direct starter, 10 A AC-3 at 400 V, Class 10, IP55, DC control 20.4-26.4 V.","salesMarkdown":"## Motor starter for direct-on-line control Control supply voltage is 20.4 to 26.4 V DC. The IP55 enclosure means the starter handles washdown and dust — suitable for food-and-bev lines, conveyor tunnels, or any area where hose-down cleaning is routine. The starter carries no PROFINET, PROFIBUS, or AS-Interface protocol support — it is an I/O-controlled unit, so it lands on a hardwired digital output from the PLC or a remote I/O slice. No fieldbus gateway is built in. The 10 A AC-3 rating at 400 V governs motor switching — that is the current the contacts can make and break across a motor load (high inrush, inductive). The same unit also carries a 10 A rating at AC at 400 V, which covers the resistive (AC-1) case. For a 4-pole induction motor on 400 V, 10 A full-load amps corresponds roughly to a 4 kW motor; verify the exact FLA on the nameplate. The 50 % low-demand rate and 75 % high-demand rate per SN 31920 define the duty cycle for the internal switching elements; stay within these to avoid premature contact wear. The operating frequency minimum of 80 operations per hour is the thermal limit for the starter mechanism under continuous cycling — not a hard ceiling for occasional jogging, but sustained high-frequency switching above this rate will exceed the thermal capacity of the bimetal and contacts.","metaTitle":"Siemens 3RK4340-3NR51-0BA0 SIRIUS Motor Starter, 10A AC-3","metaDescription":"Siemens SIRIUS 3RK4340-3NR51-0BA0 motor starter, 10 A AC-3 at 400 V, Class 10, IP55. DC control 20.4-26.4 V. Current lifecycle stage, 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":"3RK4340-3NR51-0BA0","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 10.00 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":"10 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":"10 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":"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","maximum short-circuit current breaking capacity (Icu) at 400 V rated value":"50 000 A","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"7 ... 10 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/8306ba2ed3e4aa7d86b5afa56279b917.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=184896&mlfb=3RK4340-3NR51-0BA0"},"ai":{"faq":[{"question":"Does the 3RK4340-3NR51-0BA0 support PROFINET?","answer":"No. This unit has no PROFINET, PROFIBUS, or AS-Interface protocol support. It is an I/O-controlled direct starter, intended for hardwired control from a PLC digital output or remote I/O."},{"question":"What is the difference between a DOL and star-delta starter for this part?","answer":"This specific order code is a direct starter (DOL), meaning the motor sees full line voltage at start. A star-delta starter reduces inrush by starting in star and switching to delta — this unit does not perform that sequence; it is a single-configuration DOL block."},{"question":"Where can I buy the 3RK4340-3NR51-0BA0?","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/3RK4340-3NR51-0BA0","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/3RK4340-3NR51-0BA0 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}}