{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-1FA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-1FA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-1FA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1FA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-1FA10, circuit breaker for transformer protection, 5 A continuous, CLASS 10 trip, 100 kA SCCR at 400 V, 3-pole, screw terminals, DIN-rail snap-on, IP20 front.","salesMarkdown":"Phase-failure detection is built in. No ground-fault detection on this variant. Width is 45 mm, height 97 mm, depth 96 mm. Clearance: zero mm backwards, zero mm at the sides — meaning you can butt them tight against the backplane and against adjacent devices without derating. That's unusual for a breaker with 100 kA interrupting capacity; most need side gaps for arc-chamber venting. This one vents forward through the IP20 finger-safe front. ## Interrupting capacity and coordination At 690 V it drops to 6 kA — that's still adequate for most 690 V distribution, but if your transformer secondary is at 690 V and the available fault current exceeds 6 kA, you need an upstream current-limiting device. The surge voltage withstand is 6 kV, which covers typical IEC 60947-2 impulse coordination for 400 V systems. Rated operational voltage for AC-3 switching duty is 690 V maximum. Operating frequency at AC-3 is 15 operations per hour max — that's a protection device, not a contactor; it's meant to stay closed except during fault or maintenance isolation. Main circuit and auxiliary/control terminals are screw-type. Solid wire: 2x 1 to 2.5 mm² or 2x 2.5 to 6 mm². Stranded: same ranges. Finely stranded with ferrule: same again. AWG equivalent: 2x 14 to 10 AWG. RoHS compliance date is 01.05.2012, meaning it meets the EU RoHS directive since that date. Shock resistance rated at 25g for 11 ms — that's marine and rail-grade, not just panel-stationary.","metaTitle":"Siemens 3RV1421-1FA10 SIRIUS Circuit Breaker, 5 A, CLASS 10,","metaDescription":"Siemens SIRIUS 3RV1421-1FA10 circuit breaker for transformer protection. 5 A continuous, CLASS 10 trip, 100 kA SCCR at 400 V. DIN-rail mount. Active production. Sourced to order ag","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","Trip Class":"CLASS 10","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","Design Of The Product":"for transformer protection","Ground Fault Detection":"No","Phase Failure Detection":"Yes","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-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":"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","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":"5 A","Installation Altitude At Height Above Sea Level Maximum":"2 000 m","Design Of The Overcurrent Release And Short-Circuit Release":"thermomagnetic","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","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"3.5 ... 5 A"}},"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=433807&mlfb=3RV1421-1FA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-1FA10/alternatives.json"},"ai":{"faq":[{"question":"Will 3RV1421-1FA10 drop into a panel specified for 3RV2021-1FA15?","answer":"Both mount on 35 mm DIN rail per DIN EN 50022 with the same 45 mm width, so the footprint is identical. Terminal capacity and wiring ranges are the same. The 3RV1421-1FA10 has a slightly different trip curve tuned for transformer protection; verify the coordination study before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-1FA10","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/3RV1421-1FA10 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}}