{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0JA10-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0JA10-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0JA10-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0JA10-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS circuit breaker, for transformer protection, size S0, A-release 0.7...1 A, N-release 21 A, screw terminal, standard switching capacity, multi-unit packaging (14 units).","salesMarkdown":"The Siemens 3RV1421-0JA10-ZW97 is a SIRIUS circuit breaker specifically designed for transformer protection — not a general motor-protective breaker. Its A-release (overload) is set at 0.7...1 A, while the N-release (instantaneous short-circuit trip) fires at 21 A, sized to handle transformer inrush without nuisance tripping on energization. This is a size S0 frame with screw terminals, standard switching capacity, and ships in a multi-unit pack of 14 pieces — a line-item quantity for panel builders who burn through these on transformer-fed sub-distribution boards. No auxiliary contacts are built in (0 NO, 0 NC, 0 CO), so if you need status feedback you'll need the separate auxiliary switch block that clips onto the side. Power dissipation runs 7.25 W total at rated load in hot state, 2.4 W per pole. In a densely packed enclosure that heat adds up — account for it in the thermal budget if you're stacking several of these side-by-side.","metaTitle":"Siemens 3RV1421-0JA10-ZW97 SIRIUS Circuit Breaker, Transform","metaDescription":"Siemens SIRIUS 3RV1421-0JA10-ZW97 circuit breaker for transformer protection, A-release 0.7-1 A, N-release 21 A, screw terminal, size S0. Lifecycle current. Sourced to order agains","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"lifecycle_stage":"current","Product brand name":"SIRIUS","Product designation":"circuit breaker","Design of the product":"for transformer protection","at AC in hot operating state":"7.25 W","at AC in hot operating state per pole":"2.4 W"}},"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=96232&mlfb=3RV1421-0JA10-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0JA10-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 3RV1421-0JA10-ZW97 and a standard motor-protective breaker like 3RV2021-1FA15?","answer":"The 3RV1421 is designed for transformer protection, with a wider gap between the overload release (0.7...1 A) and the instantaneous short-circuit trip (21 A) to handle transformer inrush. A motor-protective breaker like the 3RV2021-1FA15 has a tighter ratio — its overload is 3.5...5 A with a short-circuit trip at 65 A — because motor starting current is lower than transformer inrush relative to full-load amps."},{"question":"Where can I buy 3RV1421-0JA10-ZW97?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does the SIRIUS brand provide for this breaker?","answer":"The SIRIUS series carries IEC and UL certifications standard for the class. Specific compliance documents (RoHS, REACH, UL file number) are available with the order documentation upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0JA10-ZW97","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/3RV1421-0JA10-ZW97 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}}