{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RA6400-1CB42","brand":"Siemens","brandSlug":"siemens","productSlug":"3RA6400-1CB42","canonicalUrl":"https://aoctrl.com/siemens/3RA6400-1CB42","factsUrl":"https://aoctrl.com/api/mcp/products/3RA6400-1CB42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RA6400-1CB42 compact motor starter, direct starter design, 4 A at 400 V AC, 53 kA breaking capacity, 24 V DC coil, IO-Link COM2, screw terminals, 45 mm width.","salesMarkdown":"## Panel fit and motor protection for a 4 A load The 3RA6400-1CB42 is a SIRIUS compact starter — a direct-starter design rated 4 A at 400 V AC in continuous duty per IEC 60947-6-2. That 4 A continuous rating sets the motor FLA it can handle; for a 0.75 hp motor at 200/208 V or 220/230 V, or a 2 hp motor at 460/480 V, this is the right-sized spec for the branch. For panels with high available fault current downstream of a large transformer, this starter holds the line without needing a current-limiting upstream device. Trip class is adjustable between CLASS 10 and CLASS 20. CLASS 10 clears a locked-rotor condition in under 10 seconds at 7.2× FLA — the faster trip protects motors with short thermal time constants (conveyor drives, pumps). CLASS 20 gives a longer window for high-inertia loads like fans or centrifuges that take longer to accelerate. ## IO-Link integration and wiring constraints IO-Link COM2 (38.4 kBaud) is onboard — the starter communicates motor current, trip status, and parameter settings back to the controller without extra analog wiring. Three LEDs on the front give local status: power, communication, and fault indication at a glance. That dual-conductor capability is useful when daisy-chaining the supply through the starter to a downstream device — saves a terminal block. Coil is 24 V DC, drawing 2.9 W at rated voltage. The DC coil means no hum and no AC pick-up dropout issues on long cable runs — but the 24 V supply must be sized for the inrush, which is higher than the holding power. ## Mounting and environmental tolerance 45 mm wide, 170 mm tall, 165 mm deep — fits a standard DIN rail footprint. Mounting is screw-and-snap-on; the starter can be mounted in any position, though vertical on horizontal DIN rail is recommended for natural convection cooling. Operating temperature range is -20 to +60 °C, storage and transport from -55 to +80 °C. That covers most indoor panel environments and unheated warehouses. Shock resistance is 60 m/s² (6g) for 10 ms, three shocks per axis; vibration tolerance is 15 mm displacement at 4-5.8 Hz and 20 m/s² acceleration at 5.8-500 Hz — rugged enough for machine-mounted panels near conveyor lines or presses. Pollution degree 3 means it's rated for conductive pollution environments — typical in industrial panels where dust, humidity, or occasional condensation are present. No conformal coating required for normal industrial use.","metaTitle":"Siemens 3RA6400-1CB42 SIRIUS Compact Starter, 4 A, 53 kA","metaDescription":"Siemens 3RA6400-1CB42 SIRIUS compact motor starter, 4 A rated at 400 V AC, 53 kA breaking capacity, IO-Link COM2.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Starters"],"specifications":{"Depth":"165 mm","Solid":"0.5 ... 4 mm², 2x (0.5 ... 2.5 mm²)","Width":"45 mm","at DC":"24 ... 24 V","title":"3RA6400-1CB42","Height":"170 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: Screw terminal Connection control circuit: screw 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":"screw-type 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":"screw-type 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 (20 ... 14)","at AC in hot operating state per pole":"0.33 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":"0.5 ... 2.5 mm², 2x (0.5 ... 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","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/31daa119aa37f48fdf61c4dcc9180344.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=351107&mlfb=3RA6400-1CB42"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RA6400-1CB42 at 400 V?","answer":"53 kA at 400 V. This is the maximum fault current the starter can interrupt safely at that voltage level."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RA6400-1CB42","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/3RA6400-1CB42 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}}