{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0CA10-ZX95","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0CA10-ZX95","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0CA10-ZX95","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0CA10-ZX95","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-0CA10-ZX95, 0.25 A rated continuous current, CLASS 10 trip class, 100 kA breaking capacity at 400 V AC, screw and snap-on mounting on 35 mm DIN rail.","salesMarkdown":"It carries a 0.25 A continuous current rating and a CLASS 10 trip class, so it coordinates with downstream contactors and overloads on motor-starting or transformer-energizing duty. The part delivers 100 kA breaking capacity at 240 V, 400 V, 500 V, and 690 V AC — a flat 100 kA across the voltage range. The 6 000 V surge voltage resistance (rated impulse withstand) supports coordination with Type 2 surge arrestors. ## Wiring and terminal details Screw-type terminals on both the main current circuit and the auxiliary/control circuit. The main terminals accept 2x (1... 2.5 mm²) solid or stranded, and 2x (2.5... 6 mm²) solid or stranded — so you can land a single 6 mm² feed or double up 2.5 mm² for a loop-through. Finely stranded with core-end processing (ferrules) is also accepted in the same ranges. The auxiliary switch option (product extension auxiliary switch: Yes) means you can add a signal contact for remote status indication without a separate terminal block. Finger-safe touch protection on the front (IP20) keeps panel builders safe during commissioning. Shock resistance is 25 g for 11 ms — rated for transport and machine-mounted vibration. The backwards and at-the-side clearance is 0 mm — no air gap required behind or beside the device, which is useful when packing breakers tight on a DIN rail.","metaTitle":"Siemens 3RV1421-0CA10-ZX95 SIRIUS Circuit Breaker, 0.25 A, T","metaDescription":"Siemens 3RV1421-0CA10-ZX95 SIRIUS circuit breaker for transformer protection. 0.25 A rated, CLASS 10 trip, 100 kA breaking capacity at 400 V. DIN rail mount. Sourced to order.","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":"100 kA","at AC-3 rated value maximum":"690 V","at AC in hot operating state":"5.5 W","Substance Prohibitance (Date)":"01.05.2012","Continuous Current Rated Value":"0.25 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":"1.8 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":"0.25 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 Component 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":"0.18 ... 0.25 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=425441&mlfb=3RV1421-0CA10-ZX95","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0CA10-ZX95/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1421-0CA10-ZX95 and how is it quoted?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — send your volume and target price, and we will come back with a friend price for you."},{"question":"What is the closest functional second-source for 3RV1421-0CA10-ZX95?","answer":"The peer candidates 3RV1011-0GA10 and 3RV1011-0HA10 are functionally similar SIRIUS breakers, but they are not transformer-protection variants — the 3RV1421-0CA10-ZX95 is specifically designed for transformer inrush. If you are replacing a 3RV1011-0GA10 in a panel, check the trip curve and continuous current rating; the 0.25 A and CLASS 10 of this part may not match the original spec without rewiring."},{"question":"What is the depth of 3RV1421-0CA10-ZX95?","answer":"The depth is 96 mm. Combined with the 45 mm width and 97 mm height, it fits a standard 45 mm modular slot on DIN rail with zero side clearance required."},{"question":"What wire sizes does the 3RV1421-0CA10-ZX95 accept?","answer":"The screw-type terminals accept 2x (1... 2.5 mm²) solid or stranded, and 2x (2.5... 6 mm²) solid or stranded. Finely stranded wire with ferrules is also accepted in the same ranges."},{"question":"What compliance documentation is available for this part?","answer":"The part carries RoHS compliance with a substance prohibitance date of 01.05.2012. The SIRIUS series typically holds UL, CSA, and CE certifications for the European and North American markets, though specific marks for this variant should be verified against the manufacturer's declaration."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0CA10-ZX95","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/3RV1421-0CA10-ZX95 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}}