{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV2321-1KC20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV2321-1KC20","canonicalUrl":"https://aoctrl.com/siemens/3RV2321-1KC20","factsUrl":"https://aoctrl.com/api/mcp/products/3RV2321-1KC20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV2321-1KC20 circuit breaker for starter combinations, 12.5 A rated current at 480/600 V, 100 kA breaking capacity at 400 V AC, screw and snap-on 35 mm DIN rail mounting, spring-loaded terminals.","salesMarkdown":"## What this SIRIUS circuit breaker does in a panel It's not a general-purpose branch breaker; it's sized and coordinated for the motor-starting duty cycle, with a rated operating frequency of 15 switching operations per hour at AC-3 (and AC-3e) maximum. Rated current lands at 12.5 A at both 480 V and 600 V, which maps to a motor output of 8 hp at 460/480 V and 10 hp at 575/600 V. The breaking capacity is the headline number here: 100 kA at 240 V and 400 V AC, dropping to 42 kA at 500 V AC and 6 kA at 690 V AC. If you're comparing against the 3RV2411-1HA20, note the different breaking capacity curve and terminal configuration — the 3RV2411 is a different frame size. The 3RV2321-1KC20 is the 45 mm-wide SIRIUS frame for starter combinations; the 3RV2411 is wider and carries higher ratings. They are not drop-in interchangeable without rewiring and re-coordinating the panel. ## Clearances and panel integration Physical dimensions: 119 mm height, 45 mm width, 97 mm depth. Clearance requirements are specified for heat dissipation: 50 mm upward, 50 mm downward, 30 mm at the sides, and zero forward or backward clearance — meaning you can butt the device against the back panel and the enclosure door without additional air gap. That's useful for shallow enclosures. No ground fault or phase failure detection built in — this is a straightforward motor-protective circuit breaker, not a multifunction electronic relay. If you need those functions, they go in the overload relay or a separate monitoring module.","metaTitle":"Siemens 3RV2321-1KC20 SIRIUS Circuit Breaker, 12.5 A, 100 kA","metaDescription":"Siemens 3RV2321-1KC20 SIRIUS circuit breaker for starter combinations. 12.5 A rated at 480/600 V, 100 kA breaking capacity at 400 V AC. Screw and snap-on DIN rail mount. Sourced to","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":"3RV2321-1KC20","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 12.5 A N-release 163 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":"2 hp","at 240 V rated value":"100 kA","at 400 V rated value":"100 kA","at 480 V rated value":"12.5 A","at 500 V rated value":"42 kA","at 600 V rated value":"12.5 A","at 690 V rated value":"4 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":"0.5 hp","at 200/208 V rated value":"3 hp","at 220/230 V rated value":"3 hp","at 460/480 V rated value":"8 hp","at 575/600 V rated value":"10 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":"42 kA","at AC at 690 V rated value":"6 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":"9.25 W","at AC-3 at 400 V rated value":"12.5 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":"12.5 A","Operating Frequency Rated Value":"50 ... 60 Hz","Operational Current Rated Value":"12.5 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":"3.1 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 ... 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":"163 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/da0d44f116170873ddb387c1095775b1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=495686&mlfb=3RV2321-1KC20"},"ai":{"faq":[{"question":"Where can I buy the 3RV2321-1KC20 and what is the lead time?","answer":"We source this part to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for your quantity and we'll provide a firm price and estimated ship date."},{"question":"What is the depth of the 3RV2321-1KC20?","answer":"97 mm depth, with zero forward clearance required — you can mount it flush against the back panel."},{"question":"What is the width of the 3RV2321-1KC20?","answer":"45 mm wide, occupying one standard module on 35 mm DIN rail."},{"question":"Will the 3RV2321-1KC20 drop into a panel specified around the 3RV2411-1HA20 without rewiring?","answer":"No — the 3RV2411-1HA20 is a different frame size with different terminal spacing and ratings. The 3RV2321-1KC20 is 45 mm wide; the 3RV2411 is wider. You would need to re-drill the mounting holes, re-terminate the conductors, and re-coordinate the fault protection."},{"question":"What compliance documentation does Siemens provide for the 3RV2321-1KC20?","answer":"Standard Siemens SIRIUS documentation includes the CE declaration of conformity and the product datasheet. For specific RoHS, REACH, or UL/cUL certification status, request the manufacturer's compliance declaration with your RFQ — we can pull the current declarations from Siemens Industry Online Support."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV2321-1KC20","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/3RV2321-1KC20 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}}