{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-4AC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-4AC10","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-4AC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4AC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2321-4AC10, for starter combinations, 45 mm width, 100 kA breaking capacity at 240 V AC, screw and snap-on DIN rail mounting.","salesMarkdown":"## SIRIUS 3RV2321-4AC10 – circuit breaker for starter combinations This isn't a general-purpose branch breaker; it's sized and coordinated for the motor branch circuit, with a rated operating voltage range of 20 to 690 V. Breaking capacity is the headline here: 100 kA at 240 V AC, 25 kA at 400 V, and 2 kA at 690 V. That 100 kA figure at 240 V means it can safely interrupt high-fault-current scenarios common in North American 240 V delta or 120/240 V split-phase panels, without upstream fuses needing to clear first. At 400 V, the 25 kA rating still covers most industrial distribution boards. Fuse backup coordination is specified: at 400 V, a gL/gG 63 A upstream fuse; at 500 V, 50 A; at 690 V, 40 A. If you're working to IEC 60947-2 or UL 508A, these fuse ratings tell you what the upstream protection needs to be to maintain the SCCR. That zero forward clearance means you can butt it against a gland plate or enclosure wall without derating, which simplifies panel layout. Terminals are screw-type on the main current circuit, accepting 2×(1…2.5 mm²) or 2×(2.5…10 mm²) solid or stranded. Main contact screws are M4. No ground-fault or phase-failure detection built in — that's by design for the starter-combination role, where the upstream motor starter or overload relay handles those functions.","metaTitle":"Siemens 3RV2321-4AC10 SIRIUS Circuit Breaker, 100 kA at 240","metaDescription":"Siemens 3RV2321-4AC10 SIRIUS circuit breaker for starter combinations. 100 kA breaking capacity at 240 V AC. Screw and snap-on DIN rail mounting. 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":"3RV2321-4AC10","Height":"97 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 40 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 16 A N-release 208 A screw 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","For Main Contacts":"M4","Mounting Position":"any","Solid Or Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 10 mm²)","Product Brand Name":"SIRIUS","Product Designation":"Circuit breaker","at 230 V rated value":"2 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"16 A","at 500 V rated value":"5 kA","at 600 V rated value":"16 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":"screw-type terminals","at 110/120 V rated value":"1 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"5 hp","at 460/480 V rated value":"10 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 5 to 6 mm","Size Of The Circuit-Breaker":"S0","Size Of The Screwdriver Tip":"Pozidriv size 2","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","at AC-3 at 400 V rated value":"16 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":"16 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"16 A","Design Of The Short-Circuit Trip":"magnetic","for AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 8)","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":"3.1 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 ... 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","with low demand rate according to SN 31920":"50 FIT","For Main Contacts With Screw-Type Terminals":"2 ... 2.5 N·m","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":"208 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/44f05bc5f7363206cbdf5a93f9cfb272.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=248754&mlfb=3RV2321-4AC10"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV2321-4AC10 at 400 V?","answer":"25 kA at 400 V AC. At 240 V it's 100 kA, and at 690 V it's 2 kA."},{"question":"Will 3RV2321-4AC10 drop into a panel specified around 3RV2121-4CA10?","answer":"Both are SIRIUS circuit breakers on the same 45 mm DIN-rail footprint, so the mechanical fit is the same. The 3RV2321-4AC10 carries higher breaking capacities (100 kA vs the 3RV2121's typical 50 kA at 240 V), so verify the SCCR coordination study still holds before swapping."},{"question":"Where can I buy 3RV2321-4AC10?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-4AC10","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/3RV2321-4AC10 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}}