{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK4340-3JR51-0BA0","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK4340-3JR51-0BA0","canonicalUrl":"https://aoctrl.com/siemens/3RK4340-3JR51-0BA0","factsUrl":"https://aoctrl.com/api/mcp/products/3RK4340-3JR51-0BA0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RK4340-3JR51-0BA0 motor starter, I/O controlled direct starter, 4 A at 400 V AC-3, CLASS 10, IP55, DC control supply 20.4-26.4 V, 3-pole, 182 x 220 x 145 mm.","salesMarkdown":"## Motor starter for 4 A loads — what the ratings mean on the line The 3RK4340-3JR51-0BA0: The IP55 enclosure keeps out dust and low-pressure water jets, so this starter can be mounted in a control panel or directly on a machine frame in a factory environment without a separate enclosure. ## Control voltage and mounting — what fits the panel The control supply is 20.4 to 26.4 V DC — a standard 24 V DC control bus works within that window. The operating voltage for the main circuit is 340 to 440 V AC at 50 or 60 Hz, covering 400 V nominal supplies with typical tolerance. Dimensions are 182 mm wide, 220 mm high, 145 mm deep — the width is the key panel-space number when laying out a row of starters. The starter has no integrated bus communication (no PROFINET, PROFIBUS, or AS-Interface), so it's a standalone I/O-controlled unit. ## Sourcing and lifecycle — current production, quoted to order No UL or CSA listing is explicitly stated in the spec record, but the IEC design and CE marking are standard for this SIRIUS series.","metaTitle":"Siemens 3RK4340-3JR51-0BA0 SIRIUS Motor Starter, 4 A","metaDescription":"Siemens SIRIUS 3RK4340-3JR51-0BA0 motor starter, 4 A at 400 V AC-3, CLASS 10, IP55, DC control. 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","title":"3RK4340-3JR51-0BA0","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 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":"direct 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","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":"2.8 ... 4 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/46ba41fab288c2b1f584dbb6fd65ca92.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=378054&mlfb=3RK4340-3JR51-0BA0"},"ai":{"faq":[{"question":"What is the closest alternative to 3RK4340-3JR51-0BA0 in the SIRIUS family?","answer":"No official successor or pin-compatible alternative is listed in the spec record. The SIRIUS motor starter family includes variants with different control voltages, communication protocols, and current ratings — confirm the specific 4 A AC-3, 24 V DC control, and I/O-controlled configuration when selecting a cross-reference."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK4340-3JR51-0BA0","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/3RK4340-3JR51-0BA0 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}}