{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0CA10","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0CA10","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0CA10","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0CA10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker for transformer protection, 3RV1421-0CA10, 3-pole, 0.25 A rated continuous current, Trip Class 10, 100 kA breaking capacity at 400 V AC, screw-type terminals, IP20 front, 45 mm width.","salesMarkdown":"## SIRIUS 3RV1421-0CA10 — transformer-protection motor starter protector The 96 mm depth and 97 mm height fit standard enclosure layouts, with 0 mm projection at the back or sides — no extra clearance needed behind the rail. IP20 on the front and finger-safe touch protection meet the basic panel-access requirements. The 0.25 A continuous current rating is the load-side limit for transformer primary protection — sized for a small control transformer, not a motor. Breaking capacity of 100 kA at 400 V AC (and at 240 V, 500 V, 690 V) is unusually high for a 0.25 A device — this part is designed for high-fault-current installations where the available short-circuit current at the transformer primary exceeds typical MCCB ratings. The 6 kV surge voltage resistance confirms it handles switching transients on the line side. The 15 operations per hour maximum at AC-3 duty is a switching-life limit, not a thermal limit; for transformer protection the switching frequency is typically far lower. ## Mounting and wiring integration Accepts solid or stranded conductors: 2× (1…2.5 mm²) or 2× (2.5…6 mm²), and finely stranded with core-end processing to the same cross-sections. AWG 14–10 for the main contacts. Any mounting position is permitted — no derating for horizontal or inverted orientation. The auxiliary switch extension (Product Extension Auxiliary Switch: Yes) means a 3RV19 series auxiliary switch block can be added on the side for remote status indication or interlocking — useful when the breaker feeds a transformer whose secondary supplies critical control power. RoHS compliance date is 01.05.2012, meeting the EU RoHS exemption timeline for industrial equipment. Shock resistance rated at 25g / 11 ms — suitable for panel mounting in machinery subject to vibration.","metaTitle":"Siemens 3RV1421-0CA10 SIRIUS Circuit Breaker, 0.25 A, Class","metaDescription":"Siemens 3RV1421-0CA10 SIRIUS circuit breaker for transformer protection. Rated 0.25 A, Trip Class 10, 100 kA breaking capacity at 400 V AC. 3-pole, screw terminals, IP20 front. Cur","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=402776&mlfb=3RV1421-0CA10","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0CA10/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3RV1421-0CA10?","answer":"This part is sourced and quoted to order against an RFQ through independent industrial distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is 3RV1421-0CA10 used for?","answer":"It is a SIRIUS circuit breaker designed for transformer protection, rated 0.25 A continuous current with Trip Class 10 and 100 kA breaking capacity at 400 V AC."},{"question":"What are the key specifications of 3RV1421-0CA10?","answer":"3-pole, 0.25 A rated current, Trip Class 10, 100 kA breaking capacity at 240-690 V AC, 690 V rated voltage, screw-type terminals, IP20 front, 45 mm width, 96 mm depth, 97 mm height, snap-on DIN rail mounting."},{"question":"Will 3RV1421-0CA10 drop into a panel specified around 3RV1011-0GA10?","answer":"Both are 3-pole SIRIUS circuit breakers on the same 45 mm DIN-rail footprint with similar screw-terminal wiring, so the panel cutout and rail space are compatible. However, the 3RV1421-0CA10 is rated 0.25 A with 100 kA breaking capacity and is designed for transformer protection, while the 3RV1011-0GA10 is a standard motor-protective breaker with different current ranges and breaking capacities — verify the load-side protection requirements before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0CA10","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 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}}