{"product_id":"siemens-circuit-breaker-for-transformer-protection-size-s0-18-25a","title":"Siemens Circuit breaker for transformer protection, size S0, 18-25A","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe Siemens 3RV2421-4DA20 is a SIRIUS size S0 circuit breaker designed for transformer protection. It offers an adjustable overload (A-Release) range of 18 … 25 A, features a fixed instantaneous short-circuit (N-Release) rating of 400 A, and is equipped with spring-type terminals for reliable conductors connection. Its compact size S0 makes it suited for small switchgear and distribution systems requiring high switching capacity.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSize S0 circuit breaker from the Siemens SIRIUS 3RV2 series\u003c\/li\u003e\n\u003cli\u003eTransformer protection version with adjustable overload range of 18 … 25 A\u003c\/li\u003e\n\u003cli\u003eFixed short-circuit trip (instantaneous) rated at 400 A (N-Release)\u003c\/li\u003e\n\u003cli\u003eSpring-type terminals for secure connection and vibration resistance\u003c\/li\u003e\n\u003cli\u003eStandard switching capacity for switchgear applications with high loads\u003c\/li\u003e\n\u003cli\u003eCompact 3-pole construction suitable for DIN-rail or panel mounting\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Series:\u003c\/strong\u003e SIRIUS 3RV2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArticle Number:\u003c\/strong\u003e 3RV2421-4DA20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSize Designation:\u003c\/strong\u003e S0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable Overload Range (A-Release):\u003c\/strong\u003e 18 … 25 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFixed Short-Circuit Release (N-Release):\u003c\/strong\u003e 400 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBreaking Capacity (Icu) at 400 V AC:\u003c\/strong\u003e 55 kA\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMain Rated Operational Current (AC-3) at 400 V:\u003c\/strong\u003e 25 A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Voltage (Ue) Range:\u003c\/strong\u003e 20 … 690 V AC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3 P\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTerminal Connection Type:\u003c\/strong\u003e Spring-type terminals for main circuit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAmbient Operating Temperature:\u003c\/strong\u003e –20 °C … +60 °C\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInstallation Depth \/ Width:\u003c\/strong\u003e Height ~119 mm, Width ~45 mm, Depth ~97 mm\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eCompliance \u0026amp; Certifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eManufactured by Siemens in accordance with SIRIUS series motor-protection and switching devices\u003c\/li\u003e\n\u003cli\u003eComplies with IEC\/EN 60947 series for circuit-breakers and automatic disconnect devices\u003c\/li\u003e\n\u003cli\u003eDesigned for use in transformer protection and industrial switchgear systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eIdeal for transformer protection and heavy duty switchgear applications where a compact size S0 circuit breaker is required with a high instantaneous trip capability. Typical use cases include protection of transformer feeders, motor distribution boards, and industrial power panels requiring reliable overload and short-circuit protection with minimal footprint.\u003c\/p\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":40775084539968,"sku":"3RV2421-4DA20","price":1542.86,"currency_code":"ZAR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0556\/3662\/3424\/files\/3RV2421-4DA20.jpg?v=1762947091","url":"https:\/\/industrial.rubicon.tech\/products\/siemens-circuit-breaker-for-transformer-protection-size-s0-18-25a","provider":"Rubicon Group Industrial Technology Shop","version":"1.0","type":"link"}