{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1321-1FC10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1321-1FC10","canonicalUrl":"https://aoctrl.com/siemens/3RV1321-1FC10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1321-1FC10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1321-1FC10, motor-protective circuit breaker for starter combinations, 3-pole, 5 A rated current, 100 kA breaking capacity at 400 V AC, screw terminals, DIN rail mount.","salesMarkdown":"It's rated for 5 A continuous current and delivers the same 5 A in AC-3 duty at 400 V, which means it directly protects a 1.5 kW motor at that voltage — no derating guesswork for a standard 4-pole induction motor. Breaking capacity sits at 100 kA up to 500 V AC, dropping to 6 kA at 690 V — that 100 kA figure covers most industrial fault levels on 400 V distribution, so you're not chasing selective coordination nightmares on a typical line. Any mounting position works; width is 45 mm. Screw-type terminals on both main and auxiliary circuits accept solid, stranded, or finely stranded wire: 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²) per clamp. That covers most panel wiring from 14 AWG up to 10 AWG. ## What it doesn't do — and why that matters This breaker has no ground fault detection and no phase failure detection built in. That's by design for a starter-combination breaker — it relies on the upstream feeder protection or a separate electronic relay for those functions. If your application requires ground fault or phase loss tripping, you'll need to add an external module or specify a different variant. It ships with no auxiliary contacts fitted (0 changeover contacts), but the product extension for an auxiliary switch is ready — you can snap one on without pulling the breaker off the rail. Rated for a maximum of 15 operations per hour at AC-3 — that's fine for infrequent start/stop cycles on a pump or fan, but not for a high-duty reversing application or a jogging station. Surge voltage resistance rated at 6,000 V. Front carries IP20 protection. Shock resistance tested to 25g for 11 ms — survives the ride on a forklift or a slammed cabinet door.","metaTitle":"Siemens 3RV1321-1FC10 SIRIUS Circuit Breaker, 5 A, 100 kA","metaDescription":"Siemens SIRIUS 3RV1321-1FC10 motor-protective circuit breaker. 5 A continuous, 100 kA breaking capacity at 400 V. Screw terminals, DIN rail mount. 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","lifecycle_stage":"current","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":"1.5 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":"6 kA","at AC in hot operating state":"7.25 W","Operating Voltage Rated Value":"690 V","Continuous Current Rated Value":"5 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","Ambient Temperature During Storage":"-50 ... +80 °C","Product Extension Auxiliary Switch":"Yes","operating frequency at AC-3 maximum":"15 1/h","Ambient Temperature During Operation":"-20 ... +60 °C","Ambient Temperature During Transport":"-50 ... +80 °C","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","number of CO contacts for auxiliary contacts":"0","operating voltage at AC-3 rated value maximum":"690 V","operational current at AC-3 at 400 V rated value":"5 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 (Switching 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=281203&mlfb=3RV1321-1FC10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1321-1FC10/alternatives.json"},"ai":{"faq":[{"question":"Does 3RV1321-1FC10 include ground fault or phase failure protection?","answer":"No. This breaker has no ground fault detection and no phase failure detection built in — those functions must be handled upstream or by an external relay."},{"question":"What wire sizes fit the terminals on 3RV1321-1FC10?","answer":"Screw terminals accept solid, stranded, and finely stranded wire: 2x (1 to 2.5 mm²) and 2x (2.5 to 6 mm²) per clamp, equivalent to 14 to 10 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1321-1FC10","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/3RV1321-1FC10 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}}