{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6400-2BB43","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6400-2BB43","canonicalUrl":"https://aoctrl.com/siemens/3RA6400-2BB43","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6400-2BB43","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6400-2BB43 compact direct motor starter, 1.25 A at 400 V AC, 53 kA SCCR, 24 V DC control, IO-Link, adjustable Trip Class 10/20, 45 mm width, DIN rail.","salesMarkdown":"## SIRIUS compact starter with IO-Link The 3RA6400-2BB43: It integrates a contactor, overload relay, and short-circuit protection into a single 45 mm wide package that snaps onto a DIN rail — no separate wiring between components. The 24 V DC control coil is standard for PLC-driven panels, and the built-in IO-Link interface (COM2, 38.4 kBaud) enables parameter adjustment, diagnostics, and status monitoring from the controller. ## Fault-current and motor protection specs Rated short-circuit breaking capacity is 53 kA at 400 V — high enough for most industrial panel main bus feeds without needing a current-limiting upstream device. The overload trip class is adjustable between Class 10 and Class 20 — set Class 10 for standard motor starting (e.g. pumps, fans) and Class 20 for high-inertia loads that need a longer acceleration ramp. Mechanical life is 10 million cycles typical, and the no-load switching frequency reaches 3600 cycles per hour — suitable for frequent start-stop applications like conveyors or packaging machines. ## Panel integration and environmental ratings Power dissipation is 2.9 W at DC — minimal heat load in a crowded panel, but still worth considering if multiple starters are ganged in a sealed enclosure. Shock resistance is 6g (60 m/s²) and vibration resistance covers 4–500 Hz at 20 m/s² — survives on vibrating machinery like compressors or conveyor drives. ## Status indication and wiring Three onboard LEDs provide local status indication — typically power, communication, and fault — so a technician can read the state without a handheld tool. IO-Link transfer rate is COM2 (38.4 kBaud), which handles parameter sets and diagnostic data for a single starter without saturating the IO-Link master cycle time.","metaTitle":"Siemens 3RA6400-2BB43 Compact Starter, 1.25 A, 53 kA","metaDescription":"Siemens SIRIUS 3RA6400-2BB43 compact motor starter, 1.25 A at 400 V, 53 kA SCCR, IO-Link, adjustable Class 10/20. Active production, quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Solid":"2x (0.25 ... 1.5 mm²)","Width":"45 mm","at DC":"24 ... 24 V","title":"3RA6400-2BB43","Height":"191 mm","at 400 V":"53 kA","Trip Class":"CLASS 10 and 20 adjustable","Recommended":"vertical, on horizontal standard mounting rail","description":"SIRIUS Compact load feeder DOL starter for IO-Link 690 V 24 V DC 0.32...1.25 A IP20 Connection main circuit: plug-in, without terminals Connection control circuit: Spring-type terminal","at DC maximum":"2.9 W","During Storage":"-55 ... +80 °C","number of LEDs":"3","Type Of Voltage":"DC","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-55 ... +80 °C","Fastening Method":"screw and snap-on mounting","IO-Link protocol":"Yes","Shock Resistance":"a=60 m/s2 (6g) with 10 ms per 3 shocks in all axes","Mounting Position":"any","at DC rated value":"24 V","Product Brand Name":"SIRIUS","Type Of Assignment":"continous operation according to IEC 60947-6-2","Degree Of Pollution":"3","Product Designation":"Compact starter for IO-Link","Vibration Resistance":"f= 4 ... 5.8 Hz, d= 15 mm; f= 5.8 ... 500 Hz, a= 20 m/s²; 10 cycles","at 400 V rated value":"370 W","at 480 V rated value":"1.25 A","at 500 V rated value":"3 kA","at 600 V rated value":"1.25 A","at 690 V rated value":"3 kA","AS-Interface protocol":"No","Design Of The Product":"direct starter","IO-Link transfer rate":"COM2 (38,4 kBaud)","For Main Current Circuit":"plug-in without terminals","at 460/480 V rated value":"0.5 hp","at 575/600 V rated value":"0.5 hp","at AC at 400 V rated value":"1.25 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"0.1 W","at AC-3 at 400 V rated value":"0.37 kW","Of Auxiliary Contacts Typical":"10 000 000","Substance Prohibitance (Date)":"05/01/2012","Insulation Voltage Rated Value":"690 V","at AWG cables for main contacts":"2x (16 ... 10), 1x 8","at DC-13 at 6 A at 24 V typical":"30 000","at AC-15 at 6 A at 230 V typical":"200 000","degree of protection NEMA rating":"other","For Auxiliary And Control Circuit":"spring-loaded terminals","Of The Signaling Contacts Typical":"10 000 000","Design Of Short-Circuit Protection":"electromagnetic","Product Extension Auxiliary Switch":"Yes","Product Function Bus Communication":"Yes","Relative Humidity During Operation":"10 ... 90 %","Without Load Current Share Typical":"2.9 W","Surge Voltage Resistance Rated Value":"6 000 V","at AWG cables for auxiliary contacts":"2x (24 ... 16)","at AC in hot operating state per pole":"0.03 W","due to burst according to IEC 61000-4-4":"4 kV main circuits, 2 kV auxiliary circuits, 2 kV IO-Link, 2 kV limit switches, 2 kV line hand-held device","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (0.25 ... 1.5 mm²)","Number Of Poles For Main Current Circuit":"3","Formula For Making Capacity Limit Current":"38.4 x Ie","Product Function Short Circuit Protection":"Yes","Supply voltage required Auxiliary voltage":"Yes","Finely Stranded Without Core End Processing":"2x (0.25 ... 1.5 mm²)","Formula For Breaking Capacity Limit Current":"32 x Ie","at AC-41 according to IEC 60947-6-2 maximum":"750 1/h","at AC-43 according to IEC 60947-6-2 maximum":"250 1/h","with high demand rate according to SN 31920":"50 %","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","operating voltage at AC-3 rated value maximum":"690 V","electrostatic discharge according to IEC 61000-4-2":"8 kV","Type Of Voltage Supply Via Input/Output Link Master":"No","Product Component Removable Terminal For Main Circuit":"Yes","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","product function control circuit interface with IO link":"Yes","conducted HF interference emissions according to CISPR11":"150 kHz ... 30 MHz Class A","field-bound HF interference emission according to CISPR11":"30 ... 1000 MHz Class A","operational current of auxiliary contacts at AC-12 maximum":"10 A","For Short-Circuit Protection Of The Auxiliary Switch Required":"fuse gL/gG: 10 A","Product Function Control Circuit Interface To Parallel Wiring":"No","Of The Address Range Of The Inputs With Cyclical Transfer Total":"2 byte","Of The Address Range Of The Outputs With Cyclical Transfer Total":"2 byte","Display Version As Status Display Of The Input/Output Link Device":"green/red dual LED","point-to-point cycle time between master and IO-Link device minimum":"2.5 ms","Product Component Removable Terminal For Auxiliary And Control Circuit":"Yes","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.32 ... 1.25 A","number of NO contacts of instantaneous short-circuit trip unit for signaling contact":"0","number of CO contacts of the current-dependent overload release for signaling contact":"0"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$335.28","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6e70b7b61f820edde1a34b6b5b48cda4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=89985&mlfb=3RA6400-2BB43"},"ai":{"faq":[{"question":"What is the short-circuit rating of 3RA6400-2BB43 at 400 V?","answer":"It is rated 53 kA at 400 V, which is high enough to withstand a fault on most industrial panel main bus feeds without requiring a current-limiting upstream breaker."},{"question":"How can I order 3RA6400-2BB43 and check availability?","answer":"This part is sourced through authorized Siemens distribution channels. No stock-holding claim is made here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6400-2BB43","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/3RA6400-2BB43 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}