{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-4BC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-4BC10","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-4BC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4BC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2321-4BC10 circuit breaker for starter combinations, 100 kA breaking capacity at 240 V AC, 25 kA at 400 V, 45 mm wide, screw terminals, DIN rail mount.","salesMarkdown":"The Siemens SIRIUS 3RV2321-4BC10 is a circuit breaker designed specifically for starter combinations — meaning it integrates directly into a motor starter assembly, handling both short-circuit and overload protection in one footprint. It mounts on a 35 mm DIN rail per DIN EN 60715, using either screw or snap-on fastening, and accepts any mounting position. The screw-type terminals on the main current circuit accept up to 2x 10 mm² solid or stranded conductors. ## Breaking capacity — what the numbers mean for panel coordination At 240 V AC this breaker interrupts 100 kA — a figure that covers most industrial service-entrance fault levels without needing an upstream current-limiting fuse. At 400 V the rating drops to 25 kA, and at 690 V to 2 kA. For a 400 V panel fed from a typical 1 MVA transformer (prospective fault around 25 kA), this breaker coordinates cleanly. The 690 V rating is lower, so verify the available fault current if the breaker lands in a 690 V circuit. ## Mounting and clearances The breaker measures 45 mm wide, 97 mm deep, and 97 mm tall. Required clearances: 50 mm above and below, 30 mm to the side, zero forward and backward. That 50 mm vertical gap is the one that catches panel layouts — if you're stacking breakers in a row, leave room for the arc-chamber venting. The 45 mm width matches the standard SIRIUS double-module footprint, so it fits alongside contactors and overload relays on the same DIN rail without adapters.","metaTitle":"Siemens 3RV2321-4BC10 SIRIUS Circuit Breaker, 100 kA at 240","metaDescription":"Siemens SIRIUS 3RV2321-4BC10 circuit breaker for starter combinations. 100 kA breaking capacity at 240 V AC, 25 kA at 400 V. Screw terminals, DIN rail mount. Current production. 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","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 50 A","Backwards":"0 mm","Downwards":"50 mm","At The Side":"30 mm","Rated Value":"20 ... 690 V","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":"3 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"20 A","at 500 V rated value":"5 kA","at 600 V rated value":"20 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":"1.5 hp","at 200/208 V rated value":"7.5 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":"10.5 W","at AC-3 at 400 V rated value":"20 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":"20 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"20 A","at AWG cables for main contacts":"2x (16 ... 12), 2x (14 ... 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 ... 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":"260 A","insulation voltage with degree of pollution 3 at AC rated value":"690 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d1028e36c24734c9826b7ee9b78b922d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=222032&mlfb=3RV2321-4BC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4BC10/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV2321-4BC10 at 400 V?","answer":"At 400 V AC the breaking capacity is 25 kA. At 240 V it is 100 kA, and at 690 V it is 2 kA."},{"question":"Where can I buy 3RV2321-4BC10 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What are the mounting dimensions and clearances for 3RV2321-4BC10?","answer":"The breaker is 45 mm wide, 97 mm deep, and 97 mm tall. It requires 50 mm clearance above and below, 30 mm to the side, and zero forward or backward clearance."},{"question":"Does 3RV2321-4BC10 drop into a panel designed for 3RV2023-4CA10?","answer":"Both breakers share the same 45 mm width and DIN-rail mounting, so the panel cutout and rail position are compatible. However, the 3RV2321-4BC10 has a higher interrupting rating (100 kA at 240 V vs. the 3RV2023-4CA10's rating), so verify that the bus bracing and upstream protection are rated for the higher fault current if you swap them."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-4BC10","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/3RV2321-4BC10 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}}