{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV6321-4FC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV6321-4FC10","canonicalUrl":"https://aoctrl.com/siemens/3RV6321-4FC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV6321-4FC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for starter combinations, size S0, 3-pole, 40 A AC-3 at 400 V, 690 V rated, screw-type terminals, screw and snap-on DIN rail mounting.","salesMarkdown":"The instantaneous magnetic short-circuit trip responds at 480 A, clearing a bolted fault fast enough to protect the contactor and downstream wiring. The S0 frame size (96 mm deep, 45 mm wide, 97 mm tall) fits standard panel layouts; clearance requirements are 50 mm above and below, 30 mm to the sides, and zero forward/backward. Screw-type terminals on top and bottom accept 2 x 1–2.5 mm² solid/stranded or 2 x 2.5–10 mm², with torque set to 2–2.5 N·m. ## Electrical ratings and environment Rated insulation voltage 690 V AC at pollution degree 3, with a surge voltage resistance of 6 kV — suitable for 400/480 V line supplies with margin. Operating frequency 50–60 Hz. Total power dissipation 14 W typical, which matters for enclosure thermal budgeting when several breakers are ganged. Ambient operating range -20 to +60 °C; transport/storage -50 to +80 °C. Installs up to 2000 m altitude without derating. Shock rated 25 g / 11 ms per IEC 60068-2-27.","metaTitle":"Siemens 3RV6321-4FC10 SIRIUS Circuit Breaker, 40 A AC-3, 690","metaDescription":"Siemens SIRIUS 3RV6321-4FC10 circuit breaker for starter combinations. 40 A AC-3 at 400 V, 690 V rated, 480 A instantaneous trip. Screw/snap-on DIN rail. Current lifecycle. Availab","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Width":"45 mm","Height":"97 mm","Upwards":"50 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"50 mm","At The Side":"30 mm","Rated Value":"690 V","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 60715","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","Design Of The Product":"for starter combinations","For Main Current Circuit":"screw-type terminals","Size Of The Circuit-Breaker":"S0","at AC-3 rated value maximum":"690 V","power loss [W] total typical":"14 W","Substance Prohibitance (Date)":"05/01/2012","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"40 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Relative Humidity During Operation":"10 ... 95 %","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 kV","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²), 1x 10 mm²","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","shock resistance according to IEC 60068-2-27":"25g / 11 ms","operational current at AC-3 at 400 V rated value":"40 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Arrangement Of Electrical Connectors For Main Current Circuit":"Top and bottom","Response Value Current Of Instantaneous Short-Circuit Trip Unit":"480 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","breaking capacity maximum short-circuit current (Icu) at AC at 400 V rated value":"20 kA","breaking capacity operating short-circuit current (Ics) at AC at 400 V rated value":"10 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/92728cc0482d72305391af5e611b4967.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621318&mlfb=3RV6321-4FC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV6321-4FC10/alternatives.json"},"ai":{"faq":[{"question":"What is the instantaneous short-circuit trip setting on this breaker?","answer":"The magnetic short-circuit trip responds at 480 A, which is fixed (non-adjustable) on this design."},{"question":"Where can I buy 3RV6321-4FC10?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV6321-4FC10","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/3RV6321-4FC10 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}