{"product_id":"aab-ret521-transformer-protection-terminal","title":"AAB RET521 Transformer Protection Terminal","description":"\u003cdiv style=\"box-sizing: content-box; margin: 0px; padding: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); touch-action: manipulation;\"\u003e\n\u003cp\u003e\u003cstrong\u003eDescription\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe AAB\u003cstrong\u003e RET521\u003c\/strong\u003e is a transformer protection terminal designed for fast, selective, and reliable protection of power transformers in utility and industrial networks.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSpecifications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e Transformer differential and backup protection\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eRated Voltage:\u003c\/strong\u003e Supports common medium‑ and high‑voltage transformer applications\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCurrent Inputs:\u003c\/strong\u003e Multiple CT channels for differential and overcurrent functions\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eVoltage Inputs:\u003c\/strong\u003e VT channels for voltage‑based protection and supervision\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCommunication:\u003c\/strong\u003e IEC 61850, Modbus, and other standard protocols\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eI\/O Capacity:\u003c\/strong\u003e Configurable digital inputs and outputs for flexible integration\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003ePower Supply:\u003c\/strong\u003e Wide‑range auxiliary supply for stable operation\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eOperating Environment:\u003c\/strong\u003e Designed for harsh substation conditions\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eDifferential Protection:\u003c\/strong\u003e High‑speed, secure transformer differential algorithm\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eBackup Protection:\u003c\/strong\u003e Overcurrent, earth‑fault, and voltage‑based protection functions\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eFault Recording:\u003c\/strong\u003e Event logs, disturbance records, and oscillography\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eSelf‑Supervision:\u003c\/strong\u003e Continuous internal diagnostics for reliability\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eFlexible Configuration:\u003c\/strong\u003e Customizable logic and parameter settings\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan\u003e\u003cstrong\u003eCommunication Support:\u003c\/strong\u003e Full IEC 61850 interoperability for modern substations\u003c\/span\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":47536048308483,"sku":"RET521","price":695.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0640\/7995\/4179\/files\/e4cb3570b6d592cfbd04e3d7dc7b9a7d_d1c10179-f86a-4cd0-a523-835aafad6256.jpg?v=1763349106","url":"https:\/\/www.runtoelectronic.com\/products\/aab-ret521-transformer-protection-terminal","provider":"Runto Electric","version":"1.0","type":"link"}