{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3JR51-1BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3JR51-1BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3JR51-1BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3JR51-1BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS motor starter MCU, I/O controlled reversing starter, 4 A at 400 V AC-3, IP55, bimetal overload, 20.4-26.4 V DC control supply.","salesMarkdown":"## What this reversing starter delivers The control supply is 20.4 to 26.4 V DC, which keeps the logic side isolated from the motor power. The main power circuit operates on 340 to 440 V AC, 50/60 Hz, and the unit draws its motor protection from a bimetal overload relay set to CLASS 10 trip curve — fast enough to protect standard induction motors during stall or jam conditions. Rated IP55, so it's sealed against dust jets and low-pressure water — suitable for washdown areas or outdoor cabinets where moisture is a concern. The enclosure dimensions are 145 mm deep, 182 mm wide, and 220 mm tall, and the mounting position allows +/-180° rotation on a vertical surface plus +/-22.5° tilt forward/backward, giving panel builders flexibility in tight layouts. The unit has no built-in bus communication (PROFINET, PROFIBUS, AS-Interface all absent), so it's a hardwired I/O-controlled device — plan your control wiring accordingly.","metaTitle":"Siemens 3RK4340-3JR51-1BA0 SIRIUS Reversing Starter","metaDescription":"Siemens SIRIUS 3RK4340-3JR51-1BA0 reversing motor starter, 4 A at 400 V AC-3, IP55, bimetal overload, 20.4-26.4 V DC control. Current lifecycle.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"145 mm","Width":"182 mm","title":"3RK4340-3JR51-1BA0","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 Reversing starter Brake without Performance class 4.00 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":"reversing starter","Number Of Digital Inputs":"0","Short Circuit Protection":"Yes","at AC at 400 V rated value":"4 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":"4 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":"1.5 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","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":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1e958c9c1295d1f5fda62028b1e8f797.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=316787&mlfb=3RK4340-3JR51-1BA0"},"ai":{"faq":[{"question":"Where can I buy 3RK4340-3JR51-1BA0?","answer":"This Siemens SIRIUS reversing starter is sourced to order against an RFQ through independent distribution channels."},{"question":"Is 3RK4340-3JR51-1BA0 a reversing starter?","answer":"Yes, the 3RK4340-3JR51-1BA0 is a reversing starter — it switches motor direction in a single enclosure, rated 4 A at 400 V AC-3."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4340-3JR51-1BA0","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/3RK4340-3JR51-1BA0 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}}