{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-1BC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-1BC20","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-1BC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-1BC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV2321-1BC20, for starter combinations, S0 size, 100 kA breaking capacity at 400 V AC, screw and snap-on DIN rail mount.","salesMarkdown":"The S0 frame size — 45 mm wide, 119 mm tall, 97 mm deep — fits standard 45 mm slot spacing on a DIN rail, so it occupies one 45 mm module. Clearance: 50 mm above and below, 30 mm to the side, zero forward or backward. That means you can pack adjacent breakers tight side-to-side, but need vertical breathing room for cable entry and heat dissipation. ## Breaking capacity — the number that matters Rated breaking capacity is 100 kA at 240 V, 400 V, and 500 V AC; at 690 V it drops to 10 kA. ## Thermal and environmental range ## Termination and wiring Main current circuit uses spring-loaded terminals — no screw torque to check, but you need a 3 mm diameter screwdriver shaft (3.0 x 0.5 mm tip) to release the spring. No ground-fault or phase-failure detection built in; this is a straight thermal-magnetic breaker for the motor branch.","metaTitle":"Siemens 3RV2321-1BC20 SIRIUS Circuit Breaker, 100 kA at 400","metaDescription":"Siemens 3RV2321-1BC20 SIRIUS circuit breaker for starter combinations. 100 kA breaking capacity at 400 V AC. Screw and snap-on DIN rail mount. S0 size. Available 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","title":"3RV2321-1BC20","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 2 A N-release 26 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":"0.13 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"2 A","at 500 V rated value":"100 kA","at 600 V rated value":"2 A","at 690 V rated value":"10 kA","Design Of The Product":"For starter combinations","Ground Fault Detection":"No","Phase Failure Detection":"No","For Main Current Circuit":"spring-loaded terminals","at 460/480 V rated value":"1 hp","at 575/600 V rated value":"1 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":"10 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":"2 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":"2 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"2 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":"26 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/dd65d9a41d449a9a94cd76d06e93a5be.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=226284&mlfb=3RV2321-1BC20"},"ai":{"faq":[{"question":"Where can I buy 3RV2321-1BC20 and how do I get a price?","answer":"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":"What is the depth of 3RV2321-1BC20?","answer":"97 mm depth, with 45 mm width and 119 mm height. The S0 frame occupies one 45 mm DIN-rail slot."},{"question":"Will 3RV2321-1BC20 drop into a panel specified around 3RV2011-0BA20 without rewiring?","answer":"Both are S0 frame circuit breakers on 35 mm DIN rail, so the physical footprint and mounting are the same. However, the 3RV2321-1BC20 is designed for starter combinations and carries a different breaking capacity and accessory set — verify the terminal layout and coil voltage match your existing wiring before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-1BC20","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/3RV2321-1BC20 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}}