{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1321-1KC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1321-1KC10","canonicalUrl":"https://aoctrl.com/siemens/3RV1321-1KC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1321-1KC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, 3RV1321-1KC10, for starter combinations, 3-pole, 12.5 A rated continuous current, 5.5 kW motor rating at 400 V AC, 100 kA breaking capacity at 400 V AC, screw-type terminals, DIN rail snap-on mounting.","salesMarkdown":"The Siemens 3RV1321-1KC10 is a SIRIUS circuit breaker designed specifically for starter combinations — motor-starting duty where the breaker provides both overload and short-circuit protection in a single device. Rated 12.5 A continuous current, it handles motor loads up to 5.5 kW at 400 V AC, with a 100 kA breaking capacity at that voltage. That 100 kA SCCR means it can safely interrupt a bolted fault on a high-capacity distribution bus without upstream fuses needing to clear — a real advantage in panel designs where coordination is tight. ## Mounting and integration Mounts via screw or snap-on onto 35 mm DIN rail per DIN EN 50022. The 45 mm width and 97 mm height fit standard enclosure rail spacing; 96 mm depth leaves clearance for wiring behind the panel door. Any mounting position is allowed, so orientation in a crowded cabinet isn't a constraint. Main circuit connections are screw-type terminals accepting solid or stranded conductors: 2x (1 to 2.5 mm²) or 2x (2.5 to 6 mm²) per pole. AWG equivalents are 2x (14 to 10). The front face carries an IP20 rating — safe for finger-probe access in a closed panel, but not for washdown environments. ## Breaking capacity across voltage Breaking capacity varies with line voltage: 100 kA at 240 V and 400 V AC, derating to 42 kA at 500 V AC, and 6 kA at 690 V AC. At 690 V the fault-current capability drops sharply — verify your available fault current at that voltage before specifying. The rated impulse withstand voltage is 6 kV, with a rated insulation voltage of 690 V.","metaTitle":"Siemens 3RV1321-1KC10 SIRIUS Circuit Breaker, 12.5 A, 5.5 kW","metaDescription":"Siemens 3RV1321-1KC10 SIRIUS circuit breaker for starter combinations. 12.5 A continuous, 5.5 kW at 400 V, 100 kA breaking capacity. Screw terminals, DIN rail mount. Current produc","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","Maximum":"2 000 m","Stranded":"2x (1 ... 2.5 mm²), 2x (2.5 ... 6 mm²)","Backwards":"0 mm","At The Side":"0 mm","Rated Value":"690 V","On The Front":"IP20","Mounting type":"screw and snap-on mounting onto 35 mm standard mounting rail according to DIN EN 50022","During Storage":"-50 ... +80 °C","at AC-3 maximum":"15 1/h","lifecycle_stage":"current","Auxiliary switch":"Yes","During Operation":"-20 ... +60 °C","During Transport":"-50 ... +80 °C","Shock resistance":"25g / 11 ms","Mounting position":"any","Product brand name":"SIRIUS","Product designation":"circuit breaker","at 400 V rated value":"5.5 kW","Design of the product":"for starter combinations","For Auxiliary Contacts":"0","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":"42 kA","at AC at 690 V rated value":"6 kA","at AC-3 rated value maximum":"690 V","Of The Main Contacts Typical":"100 000","at AC in hot operating state":"9.25 W","Continuous current rated value":"12.5 A","at AWG conductors for main contacts":"2x (14 ... 10)","Surge voltage resistance rated value":"6 000 V","at AC in hot operating state per pole":"3.1 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","For Auxiliary And Control Current Circuit":"screw-type terminals","Removable Terminal For Auxiliary And Control Circuit":"No","Design of the overcurrent release and short-circuit release":"magnetic","Arrangement of electrical connectors for main current circuit":"front side"}},"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=439508&mlfb=3RV1321-1KC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1321-1KC10/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1321-1KC10","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/3RV1321-1KC10 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}}