{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-4CC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-4CC20","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-4CC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4CC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2321-4CC20, for starter combinations, 45 mm width, 55 kA breaking capacity at 400 V AC, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"This is not a general-purpose feeder breaker; its coordination curve is tailored for motor starting inrush, so it holds during start and trips on a sustained fault. The 45 mm width (three 18 mm modules) keeps the footprint tight on a DIN rail — useful when you're packing multiple motor starters into a single enclosure. The 97 mm depth means it protrudes about 10 mm beyond a standard 80 mm deep enclosure backplate — check your gland plate depth before committing. The 3RV2321-4CC20 delivers 55 kA at 400 V AC and 25 kA at 400 V — the higher figure is the ultimate breaking capacity (Icu), the lower is the service breaking capacity (Ics) at that voltage. At 690 V it still interrupts 2 kA, enough for most 690 V motor circuits. The gL/gG fuse backup ratings (63 A at 400 V, 50 A at 500/690 V) tell you what upstream fuse preserves the breaker's SCCR if fault current exceeds its standalone rating — useful when retrofitting into an existing panel with unknown available fault current. ## Motor ratings and thermal environment Motor full-load current ratings: 3 hp at 230 V, 7.5 hp at 200/208 V and 220/230 V, 15 hp at 460/480 V. The 480 V rating is 22 A, which aligns with a NEMA size 1 starter.","metaTitle":"Siemens 3RV2321-4CC20 SIRIUS Circuit Breaker, 55 kA at 400 V","metaDescription":"Siemens 3RV2321-4CC20 SIRIUS circuit breaker for starter combinations. 55 kA breaking capacity at 400 V AC, 25 kA at 400 V. 45 mm wide, DIN rail mount. Sourced to order against RFQ","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":"3RV2321-4CC20","Height":"119 mm","Upwards":"50 mm","Forwards":"0 mm","at 400 V":"gL/gG 63 A","at 500 V":"gL/gG 50 A","at 690 V":"gL/gG 50 A","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 22 A N-release 286 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":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"22 A","at 500 V rated value":"5 kA","at 600 V rated value":"22 A","at 690 V rated value":"2 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":"1.5 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"7.5 hp","at 460/480 V rated value":"15 hp","at AC at 240 V rated value":"100 kA","at AC at 400 V rated value":"55 kA","at AC at 500 V rated value":"10 kA","at AC at 690 V rated value":"4 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":"10.5 W","at AC-3 at 400 V rated value":"22 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":"22 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"22 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":"3.5 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":"286 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/033faaccb09969e21b23e0040f4ddc56.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=239186&mlfb=3RV2321-4CC20"},"ai":{"faq":[{"question":"Where can I buy 3RV2321-4CC20 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"Will 3RV2321-4CC20 drop into a panel specified around 3RV2021-4CA25?","answer":"Both are 45 mm wide SIRIUS circuit breakers on the same DIN rail footprint, so mechanical fit is identical. The 3RV2321-4CC20 carries a higher 55 kA breaking capacity at 400 V AC versus the 3RV2021-4CA25's lower rating — verify your available fault current and coordination study before swapping, as the trip curves may differ."},{"question":"What compliance documentation does Siemens provide for 3RV2321-4CC20?","answer":"As a standard SIRIUS industrial control product, it carries CE marking for the European market and is designed to meet IEC/EN 60947-2 and 60947-4-1. RoHS and REACH declarations are available from Siemens. Specific UL/CSA file numbers should be verified against the nameplate marking on the unit received."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-4CC20","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/3RV2321-4CC20 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}}