{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV6321-4EC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV6321-4EC10","canonicalUrl":"https://aoctrl.com/siemens/3RV6321-4EC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV6321-4EC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for starter combinations, size S0, 3-pole, 32 A AC-3 at 400 V, 690 V rated, magnetic short-circuit trip 400 A, screw terminals, snap-on 35 mm DIN rail.","salesMarkdown":"## What this SIRIUS breaker does in a motor branch The magnetic short-circuit trip responds at 400 A, so it clears a bolted fault fast enough to protect the contactor downstream without welding the main contacts. The S0 frame size keeps the width at 45 mm — three of these fit in a standard 145 mm wide DIN-rail section, which matters for panel density. Depth is 96 mm, so it clears a 100 mm deep enclosure but check gland-plate clearance if the backplane is tight. ## Clearance and mounting — what fits where The 3RV6321-4EC10 needs 50 mm clearance above and below for air circulation and arc-chamber venting, 30 mm at the sides. Zero clearance forwards and backwards — it can sit flush against a backplate or enclosure door. That 50 mm vertical gap is non-negotiable if you want the breaker to trip free under fault without ionized gas tracking to adjacent metalwork. Terminal capacity: screw-type terminals accept 2 x (1 to 2.5 mm²) solid/stranded or 2 x (2.5 to 10 mm²), with a tightening torque of 2 to 2.5 N·m. For finely stranded wire with ferrule, it takes 2 x (1 to 2.5 mm²), 2 x (2.5 to 6 mm²), or a single 10 mm². That covers most panel-building wire sizes up to the 32 A rating without needing adapter lugs. ## Lifecycle and compliance — what the nameplate tells procurement Relative humidity 10 to 95 % non-condensing. Shock resistance 25 g / 11 ms per IEC 60068-2-27 — survives a forklift bump into the panel or a nearby press hit.","metaTitle":"Siemens 3RV6321-4EC10 SIRIUS Circuit Breaker, 32 A AC-3, 690","metaDescription":"Siemens 3RV6321-4EC10 SIRIUS circuit breaker for starter combinations. 32 A AC-3 at 400 V, 690 V rated, magnetic short-circuit trip at 400 A. Screw and snap-on 35 mm DIN rail. Acti","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 DIN 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":"11 W","Substance Prohibitance (Date)":"05/01/2012","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"32 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":"32 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":"400 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V","maximum short-circuit current breaking capacity (Icu) at AC at 400 V rated value":"55 kA","operating short-circuit current breaking capacity (Ics) at AC at 400 V rated value":"25 kA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621317&mlfb=3RV6321-4EC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV6321-4EC10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3RV6321-4EC10 and what is the lead time?","answer":"We source and quote the 3RV6321-4EC10 to order against an RFQ. Availability and current pricing are confirmed at quote time through our independent distribution network. Submit an RFQ for a firm price and lead time."},{"question":"Will the 3RV6321-4EC10 drop into a panel specified around the 3RV6021-4DA10?","answer":"Mechanically yes — both mount on 35 mm DIN rail with screw terminals in the S0 frame size. Electrically, verify the AC-3 current rating and the instantaneous short-circuit trip point match your motor protection scheme. The 3RV6321-4EC10 is rated 32 A AC-3 with a 400 A magnetic trip; confirm these align with the original specification."},{"question":"What compliance documentation does Siemens provide for the 3RV6321-4EC10?","answer":"The part carries a substance prohibitance date of 05/01/2012, aligning with EU RoHS recast requirements. It is designed to IEC/EN 60947-2 and 60947-4-1 standards for motor circuit protectors. Insulation voltage 690 V at pollution degree 3, surge voltage resistance 6 kV. Standard Siemens documentation includes the declaration of conformity and the datasheet."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV6321-4EC10","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/3RV6321-4EC10 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}}