{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1321-0KC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1321-0KC10","canonicalUrl":"https://aoctrl.com/siemens/3RV1321-0KC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1321-0KC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1321-0KC10 circuit breaker for starter combinations, 1.25 A continuous rated current, 100 kA breaking capacity at 400 V AC, 3-pole, screw terminals, DIN rail mount, IP20.","salesMarkdown":"Rated at 1.25 A continuous current, it is sized for small motor loads — at 400 V AC it covers a 0.37 kW motor, which is typical for fractional-horsepower pumps, fans, or conveyor drives in light industrial lines. The headline figure here is the 100 kA breaking capacity, held flat across 240 V, 400 V, 500 V, and 690 V AC. The 45 mm width (3-module) footprint is standard for this class; height is 97 mm, depth 96 mm. Zero clearance required backwards, zero at the sides — so it can be packed tight against other devices on the rail without derating. ## Electrical and thermal limits for the specifier Maximum operating frequency at AC-3 duty is 15 operations per hour, so this is not a high-cycling device; it is sized for occasional motor starts, not rapid jogging. Shock resistance is rated at 25g / 11 ms, which covers most industrial vibration environments including conveyor systems and machine tools. Main and auxiliary/control circuits both use screw-type terminals. Solid and stranded conductors are accepted: 2x (1... 2.5 mm²) or 2x (2.5... 6 mm²) per clamp, with AWG equivalents of 2x (14... 10). Finely stranded with core end processing is also supported in the same ranges. RoHS compliance is confirmed with a substance prohibition date of 01.05.2012, covering the EU RoHS directive. The part does not include ground fault detection or phase failure detection — those functions must be handled upstream in the motor protection relay or drive. The auxiliary switch extension is available as an option (product extension auxiliary switch = Yes), allowing remote status signaling.","metaTitle":"Siemens 3RV1321-0KC10 SIRIUS Circuit Breaker, 1.25 A, 100 kA","metaDescription":"Siemens 3RV1321-0KC10 SIRIUS circuit breaker for starter combinations. 1.25 A continuous, 100 kA breaking capacity at 400 V. DIN rail mount, IP20. Current lifecycle stage. Quoted t","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"96 mm","Solid":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Width":"45 mm","Height":"97 mm","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Backwards":"0 mm","At The Side":"0 mm","Rated Value":"690 V","During Storage":"-50 ... +80 °C","lifecycle_stage":"current","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Fastening Method":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","Shock Resistance":"25g / 11 ms","Mounting Position":"any","Product Brand Name":"SIRIUS","Product Designation":"circuit breaker","at 400 V rated value":"0.37 kW","Design Of The Product":"for starter combinations","Ground Fault Detection":"No","Phase Failure Detection":"No","For Main Current Circuit":"screw-type terminals","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":"100 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"7.25 W","Substance Prohibitance (Date)":"01.05.2012 00:00:00","Continuous Current Rated Value":"1.25 A","at AWG cables for main contacts":"2x (14 ... 10)","protection class IP on the front":"IP20","For Auxiliary And Control Circuit":"screw-type terminals","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Surge Voltage Resistance Rated Value":"6 000 V","at AC in hot operating state per pole":"2.4 W","Finely Stranded With Core End Processing":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Number Of Poles For Main Current Circuit":"3","Touch Protection Against Electrical Shock":"finger-safe","number of CO contacts for auxiliary contacts":"0","operational current at AC-3 at 400 V rated value":"1.25 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"magnetic","Arrangement Of Electrical Connectors For Main Current Circuit":"front side","Product Function Removable Terminal For Auxiliary And Control Circuit":"No","Mechanical Service Life (Operating Cycles) Of The Main Contacts Typical":"100 000"}},"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=42661&mlfb=3RV1321-0KC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1321-0KC10/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 3RV1321-0KC10 at 400 V?","answer":"100 kA at 400 V AC, and the same 100 kA rating holds at 240 V, 500 V, and 690 V AC — flat across the voltage range."},{"question":"Will 3RV1321-0KC10 drop into a panel specified around 3RV1011-0GA10?","answer":"Both are SIRIUS circuit breakers on the same 45 mm DIN-rail footprint, so the mechanical fit is the same. The key difference is the current rating and breaking capacity — verify your branch circuit's continuous current and available fault current against the 3RV1321-0KC10's 1.25 A and 100 kA ratings before swapping."},{"question":"What compliance documentation does Siemens provide for 3RV1321-0KC10?","answer":"RoHS compliance is documented with a substance prohibition date of 01.05.2012. The part carries IP20 front protection and is designed for 690 V rated insulation voltage. Standard Siemens declarations of conformity and the product datasheet cover the applicable IEC/EN standards for motor protection circuit breakers."},{"question":"Where can I buy 3RV1321-0KC10 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time on your required quantity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1321-0KC10","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/3RV1321-0KC10 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}}