{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6400-2CB43","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6400-2CB43","canonicalUrl":"https://aoctrl.com/siemens/3RA6400-2CB43","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6400-2CB43","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS compact starter with IO-Link, 24 VDC coil, 4 A rated operational current at 400 V AC, adjustable trip class 10/20, 53 kA breaking capacity at 400 V, screw and snap-on mounting on DIN rail.","salesMarkdown":"## What this SIRIUS compact starter does The Siemens 3RA6400-2CB43 is a SIRIUS compact starter — a direct-on-line motor starter that integrates a contactor, overload relay, and IO-Link communication into a single 45 mm wide device. It is designed for continuous operation per IEC 60947-6-2, meaning it handles steady motor loads without derating for intermittent duty. The 24 VDC coil (rated 24 V) draws a maximum of 2.9 W, which is the holding power you need to budget for in your 24 VDC control supply. The headline rating here is 4 A at 400 V AC (AC-3 motor switching), which translates to 1.5 kW (2 hp) motor capacity at 400 V. At 460/480 V it handles 2 hp, and at 575/600 V it goes up to 3 hp. That 4 A figure is the AC-3 rating — the current it can switch under motor-start conditions — not the resistive (AC-1) rating, which would be higher. For a 4-pole induction motor around 1.5 kW at 400 V, this is the right fit. The adjustable trip class (Class 10 and 20) means you set the overload relay's thermal memory to match the motor's start profile. Class 10 for fast-starting fans and pumps; Class 20 for high-inertia loads like conveyors or crushers that take longer to accelerate. That adjustability saves stocking two separate overload relays. ## IO-Link and connectivity This compact starter speaks IO-Link at COM2 (38.4 kBaud), which is the standard rate for most IO-Link masters. It does not support AS-Interface — that is a different protocol variant in the SIRIUS family. The IO-Link interface gives you access to the device's three status LEDs, parameter settings (trip class, current rating), and diagnostic data (thermal load, number of starts) directly through your IO-Link master. No separate analog or digital input card needed for the motor data. The main circuit connection is plug-in without terminals — meaning the power wiring uses a separate connector system, not screw terminals on the device body. The control wiring accepts 2x (0.25 to 1.5 mm²) solid or stranded conductors. That is typical for spring-cage or push-in terminals on the control side; verify your ferrule size if using stranded. The 45 mm width means it takes two standard 22.5 mm module positions. Any mounting position is allowed, but vertical on a horizontal DIN rail is the recommended orientation for convection cooling. Dimensions: 191 mm high, 45 mm wide, 165 mm deep — check your enclosure depth, especially if using a shallow 200 mm panel. Vibration resistance: 4 to 5.8 Hz at 15 mm amplitude, then 5.8 to 500 Hz at 20 m/s² for 10 cycles. Shock resistance: 60 m/s² (6g) for 10 ms, 3 shocks per axis. That covers most machine-mounted applications without additional damping. For a BOM line that specifies the 3RA6400-2CB43, the fit is confirmed by the 24 VDC coil, the 4 A AC-3 rating at 400 V, and the IO-Link COM2 protocol. The adjustable trip class (10/20) gives you flexibility across different motor loads without changing the part number.","metaTitle":"Siemens 3RA6400-2CB43 SIRIUS Compact Starter, IO-Link","metaDescription":"Siemens 3RA6400-2CB43 SIRIUS compact starter with IO-Link, 24 VDC coil, 4 A at 400 V AC, adjustable Class 10/20. Current lifecycle stage.","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":"3RA6400-2CB43","Height":"191 mm","at 400 V":"53 kA","Trip Class":"CLASS 10 and 20 adjustable","Recommended":"vertical, on horizontal standard DIN rail","description":"SIRIUS Compact load feeder DOL starter for IO-Link 690 V 24 V DC 1...4 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":"1 500 W","at 480 V rated value":"4 A","at 500 V rated value":"3 kA","at 600 V rated value":"4 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 200/208 V rated value":"0.75 hp","at 220/230 V rated value":"0.75 hp","at 460/480 V rated value":"2 hp","at 575/600 V rated value":"3 hp","at AC at 400 V rated value":"4 A","NO-Load Switching Frequency":"3 600 1/h","Of The Main Contacts Typical":"10 000 000","at AC in hot operating state":"1 W","at AC-3 at 400 V rated value":"1.5 kW","Of Auxiliary Contacts Typical":"10 000 000","Substance Prohibitance (Date)":"05/01/2012","Insulation Voltage Rated Value":"690 V","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 AC in hot operating state per pole":"0.33 W","for AWG cables for auxiliary contacts":"2x (24 ... 16)","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":"12 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 Limit Current Breaking Capacity":"10 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":"1 ... 4 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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6de3eab82ecc7fe6a7d50cd9148fb06a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=24522&mlfb=3RA6400-2CB43"},"ai":{"faq":[{"question":"Is 3RA6400-2CB43 compatible with 24V DC systems?","answer":"Yes, the coil is rated for 24 V DC (24 V rated value) and draws a maximum of 2.9 W. It is a DC-operated device, so it connects directly to a standard 24 VDC control supply."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6400-2CB43","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/3RA6400-2CB43 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}}