{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-4NC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-4NC10","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-4NC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4NC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2321-4NC10, for starter combinations, 45 mm wide, 100 kA interrupting capacity at 240 V AC, screw terminals.","salesMarkdown":"Rated for 20 to 690 V AC, it carries a gL/gG fuse backup rating of 63 A across the 400 V, 500 V, and 690 V levels, so the fuse coordination is consistent regardless of the line voltage within that range. The interrupting capacity hits 100 kA at 240 V AC, dropping to 25 kA at 400 V and 2 kA at 690 V — the SCCR headroom at the lower voltages is substantial for a 45 mm wide frame. Clearance requirements: 50 mm upwards and downwards, 30 mm at the sides, zero forwards and backwards. That zero forwards clearance is notable — the breaker can be mounted flush against a panel door or rear wall without derating. ## Ratings in context The breaker is rated for starter combination duty, which means it's intended to be paired with a contactor for motor starting and overload protection. The AC-3 and AC-3e maximum switching rate is 15 operations per hour — this is not a high-cycling device; it's sized for occasional motor starts, not frequent jogging or inching. Horsepower ratings span from 2 hp at 110/120 V up to 20 hp at 460/480 V, covering common North American motor sizes. The main circuit uses screw-type terminals accepting 2x 1 to 2.5 mm² solid/stranded or 2x 2.5 to 10 mm², with M4 thread on the main contacts.","metaTitle":"Siemens 3RV2321-4NC10 SIRIUS Circuit Breaker, 45 mm, 100 kA","metaDescription":"Siemens SIRIUS 3RV2321-4NC10 circuit breaker for starter combinations. 45 mm wide, 100 kA interrupting at 240 V AC. Current production. Quoted to order.","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 63 A","at 690 V":"gL/gG 63 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":"5 hp","at 240 V rated value":"100 kA","at 400 V rated value":"25 kA","at 480 V rated value":"28 A","at 500 V rated value":"5 kA","at 600 V rated value":"28 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":"2 hp","at 200/208 V rated value":"7.5 hp","at 220/230 V rated value":"10 hp","at 460/480 V rated value":"20 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":"13.25 W","at AC-3 at 400 V rated value":"28 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":"28 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"28 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":"4.4 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 ... 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":"400 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":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=450416&mlfb=3RV2321-4NC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV2321-4NC10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV2321-4NC10 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock figures or lead-time numbers are published here."},{"question":"What is the interrupting capacity of 3RV2321-4NC10 at 400 V?","answer":"25 kA at 400 V rated value. At 240 V AC it reaches 100 kA, and at 690 V it is 2 kA."},{"question":"What clearance is needed around 3RV2321-4NC10?","answer":"50 mm upwards and downwards, 30 mm at the sides, and zero forwards or backwards — it can mount flush against a panel surface."},{"question":"Will 3RV2321-4NC10 drop into a panel specified for 3RV2023-4DA10?","answer":"Both are 45 mm wide SIRIUS breakers on 35 mm DIN rail, so the rail footprint and terminal layout are the same. The 3RV2321-4NC10 is a higher-current variant (gL/gG 63 A fuse backup vs the 3RV2023-4DA10's lower rating), so verify the load current and coordination study before swapping — the physical fit is identical, but the protection settings differ."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-4NC10","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/3RV2321-4NC10 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}}