{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3GR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3GR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3GR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3GR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU, I/O controlled, direct starter, 2.5 A at AC-3 400 V, Class 10, IP55, 3RK4340-3GR51-0BA0.","salesMarkdown":"The Siemens SIRIUS 3RK4340-3GR51-0BA0 is an I/O-controlled motor starter MCU (Motor Control Unit) configured as a direct starter with electromechanical switching contacts. It is designed for three-phase motor loads up to 2.5 A in AC-3 duty at 400 V, making it suitable for standard induction motors on pumps, fans, and conveyors in a control panel. Rated operating voltage is 340 to 440 V AC at 50/60 Hz, and the control supply is 20.4 to 26.4 V DC. The AC-3 rating of 2.5 A at 400 V is the load-bearing number for motor switching — it covers starting inrush and breaking under load. Class 10 trip protection (bimetal) means the overload relay will trip within 10 seconds at 7.2× rated current, matching standard motor start profiles for pumps and light conveyors. Operating frequency is rated at 80 cycles per hour, which governs the thermal cycling of the bimetal and contacts — fine for normal start/stop duty, but not for high-reversing or jogging applications. Ambient temperature range is -25 to +35 °C; above 35 °C you need to derate or provide additional cooling. The mounting position allows +/-180° rotation on a vertical surface and +/-22.5° tilt, giving flexibility in tight enclosures. RoHS compliance is confirmed with a substance prohibitance date of May 1, 2012, covering the EU RoHS directive. The part carries a reference code per IEC 81346-2 (Q for switching device), which helps with documentation traceability in larger projects.","metaTitle":"Siemens 3RK4340-3GR51-0BA0 SIRIUS Motor Starter, 2.5 A AC-3","metaDescription":"Siemens SIRIUS 3RK4340-3GR51-0BA0 motor starter MCU, I/O controlled, direct starter. Rated 2.5 A at AC-3, 400 V, Class 10, IP55.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","title":"3RK4340-3GR51-0BA0","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 2.50 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":"2.5 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":"2.5 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":"0.8 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":"1.8 ... 2.5 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7373d6a6e5dc492848112d73fa912cdd.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=464950&mlfb=3RK4340-3GR51-0BA0"},"ai":{"faq":[{"question":"Where can I buy the Siemens 3RK4340-3GR51-0BA0 motor starter?","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":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4340-3GR51-0BA0","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/3RK4340-3GR51-0BA0 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}}