{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV1421-0FA10-ZW97","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV1421-0FA10-ZW97","canonicalUrl":"https://aoctrl.com/siemens/3RV1421-0FA10-ZW97","factsUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA10-ZW97","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS 3RV1421-0FA10-ZW97 circuit breaker for transformer protection, adjustable overload release 0.35-0.5 A, N-release 10 A, screw terminals, standard switching capacity, multi-unit packaging (14 units).","salesMarkdown":"## Transformer Protection Breaker, SIRIUS Size S00 The Siemens SIRIUS 3RV1421-0FA10-ZW97 is a three-pole circuit breaker specifically designed for transformer protection, not general motor protection. Its adjustable overload release covers 0.35 to 0.5 A, with a fixed N-release (instantaneous magnetic trip) set at 10 A. This means the breaker protects the transformer primary against sustained overloads via the thermal element, while the magnetic trip handles short-circuits — but the 10 A magnetic threshold is deliberately high to avoid nuisance tripping on transformer inrush current, which can be several times the full-load rating for tens of milliseconds. The unit mounts via screw and snap-on onto 35 mm DIN rail per DIN EN 60715, fitting the standard S00 frame size (45 mm wide, 90 mm high, 75 mm deep). Screw terminals accept 2x (0.5 to 1.5 mm²) solid or 2x (0.75 to 2.5 mm²) finely stranded with ferrule. Torque the main and auxiliary contacts to 0.8-1.2 N·m using a Pozidriv size 2 tip. The rocker switch provides visual switching status indication. The Substance Prohibitance date of 01.05.2012 indicates RoHS compliance per EU Directive 2011/65/EU, with no restricted substances above threshold limits as of that date. ## Panel Fit & Integration This breaker occupies the same S00 footprint as the motor-protection siblings (3RV1011-0GA10, 3RV1011-0HA10, 3RV1011-1AA15) — same 45 mm width, same DIN-rail clip, same terminal layout. If a panel was originally wired for a 3RV1011 motor-protective breaker, the 3RV1421 will drop into the same mounting hole and busbar arrangement without rewiring. The difference is internal: the overload release curve is tailored for transformer inrush, not motor starting characteristics (no Class 10 trip class). The auxiliary switch option (product extension auxiliary switch = Yes) allows adding a remote status contact, though this variant ships without one fitted. The auxiliary contact slot accepts standard SIRIUS S00 auxiliary switch blocks.","metaTitle":"Siemens 3RV1421-0FA10-ZW97 SIRIUS Circuit Breaker, 0.35-0.5","metaDescription":"Siemens SIRIUS 3RV1421-0FA10-ZW97 circuit breaker for transformer protection, 0.35-0.5 A adjustable overload, 10 A N-release, screw terminals. Current lifecycle stage. Sourced to o","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":"5.5 W","Substance Prohibitance (Date)":"01.05.2012","at AC in hot operating state per pole":"1.8 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=130293&mlfb=3RV1421-0FA10-ZW97","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV1421-0FA10-ZW97/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 3RV1421-0FA10-ZW97 and the motor-protection 3RV1011-0GA10?","answer":"Both share the same S00 frame, DIN-rail mount, and terminal layout — they are physically interchangeable in a panel. The 3RV1421 is designed for transformer protection with an adjustable overload of 0.35-0.5 A and a fixed magnetic trip at 10 A, while the 3RV1011-0GA10 is a motor-protective breaker with a Class 10 trip curve, adjustable overload of 0.45-0.63 A, and magnetic trip at 8.2 A. The transformer breaker has a higher magnetic threshold to ride through inrush without tripping."},{"question":"Where can I buy 3RV1421-0FA10-ZW97 and how is it quoted?","answer":"This part is sourced through independent industrial distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for volume or single-unit requirements."},{"question":"What compliance documentation is available for this breaker?","answer":"The Substance Prohibitance date of 01.05.2012 confirms RoHS compliance per EU Directive 2011/65/EU. The SIRIUS series carries UL, CSA, and CE approvals as standard for the product family; specific certification markings are on the nameplate."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV1421-0FA10-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/3RV1421-0FA10-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}}