{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-1EC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-1EC20","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-1EC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-1EC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2321-1EC20, for starter combinations, 100 kA breaking capacity at 400 V AC, spring-loaded terminals, 45 mm width.","salesMarkdown":"At 45 mm wide and 97 mm deep, it occupies a standard 45 mm modular device footprint — one width unit on the DIN rail. The 119 mm height clears most 200 mm-deep enclosures with room for wiring ducts above and below. The 3RV2321-1EC20 delivers 100 kA breaking capacity at 240 V AC and 400 V AC, and 100 kA at 500 V AC. At 690 V AC it still interrupts 6 kA. The 4 A continuous rating at 480 V and 600 V (and 4 A at 690 V) tells you this is for smaller motor loads — fractional-horsepower pumps, fans, conveyors up to about 3 hp at 575/600 V. The rated switching frequency of 15 operations per hour at AC-3 duty matches typical start-stop cycles for a compressor or a small conveyor; it is not sized for high-cycle jogging applications. ## Terminals and wiring No ground-fault or phase-failure detection built in; those functions are handled upstream or by the connected overload relay.","metaTitle":"Siemens 3RV2321-1EC20 SIRIUS Circuit Breaker, 100 kA @ 400 V","metaDescription":"Siemens 3RV2321-1EC20 SIRIUS circuit breaker for starter combinations. 100 kA breaking capacity at 400 V AC. Spring-loaded terminals, DIN rail mount. Available to order; request qu","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"97 mm","Width":"45 mm","title":"3RV2321-1EC20","Height":"119 mm","Upwards":"50 mm","Forwards":"0 mm","Backwards":"0 mm","Downwards":"50 mm","At The Side":"30 mm","Rated Value":"20 ... 690 V","description":"Circuit breaker size S0 for starter combination Rated current 4 A N release 52 A Spring-type terminal Standard switching capacity","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","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","at AC-3e maximum":"15 1/h","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"0.33 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"4 A","at 500 V rated value":"100 kA","at 600 V rated value":"4 A","at 690 V rated value":"4 kA","Design Of The Product":"For starter combinations","Ground Fault Detection":"No","Phase Failure Detection":"No","For Main Current Circuit":"spring-loaded terminals","at 110/120 V rated value":"0.13 hp","at 200/208 V rated value":"0.8 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 240 V rated value":"100 kA","at AC at 400 V rated value":"100 kA","at AC at 500 V rated value":"100 kA","at AC at 690 V rated value":"6 kA","Design Of Screwdriver Shaft":"Diameter 3 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"3,0 x 0,5 mm","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"7.25 W","at AC-3 at 400 V rated value":"4 A","at AC-3e rated value maximum":"690 V","Of Auxiliary Contacts Typical":"100 000","Substance Prohibitance (Date)":"10/01/2009","at AC-3e at 400 V rated value":"4 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"4 A","at AWG cables for main contacts":"2x (18 ... 8)","Design Of The Short-Circuit Trip":"magnetic","Product Extension Auxiliary Switch":"Yes","Relative Humidity During Operation":"10 ... 95 %","Display Version For Switching Status":"Handle","Surge Voltage Resistance Rated Value":"6 kV","at AC in hot operating state per pole":"2.4 W","With Side-By-Side Mounting At The Side":"0 mm","reference code according to IEC 81346-2":"Q","Finely Stranded With Core End Processing":"2x (1 ... 6 mm²)","Number Of Poles For Main Current Circuit":"3","Product Function Short Circuit Protection":"Yes","with low demand rate according to SN 31920":"50 FIT","Finely Stranded Without Core End Processing":"2x (1 ... 6 mm²)","with high demand rate according to SN 31920":"50 %","number of CO contacts for auxiliary contacts":"0","number of NC contacts for auxiliary contacts":"0","number of NO contacts for auxiliary contacts":"0","shock resistance according to IEC 60068-2-27":"25g / 11 ms","Electrical Endurance (Operating Cycles) Typical":"100 000","Size Of Contactor Can Be Combined Company-Specific":"S00, S0","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":"52 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/6f2e69ec6963582d967f8bb9adfa1404.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=105391&mlfb=3RV2321-1EC20"},"ai":{"faq":[{"question":"What are the key ratings of the 3RV2321-1EC20?","answer":"It has 100 kA breaking capacity at 400 V AC, a 4 A continuous rating at 480/600 V, and spring-loaded terminals for the main circuit. It is designed for starter combinations and mounts on 35 mm DIN rail."},{"question":"How do I get pricing and availability for the 3RV2321-1EC20?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Current pricing and availability are confirmed at quote time."},{"question":"Will the 3RV2321-1EC20 drop into a panel designed for the 3RV2021-1GA25?","answer":"Both are 45 mm wide SIRIUS breakers on the same DIN rail footprint, so the mechanical fit is the same. Verify the 3RV2321-1EC20's higher breaking capacity (100 kA vs the 3RV2021-1GA25's rating) and the 4 A continuous rating match your load before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-1EC20","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/3RV2321-1EC20 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}