{"product_id":"abb-ret521-1mrk001530-ae-transformer-protection-terminal","title":"ABB RET521 (1MRK001530-AE) Transformer Protection Terminal","description":"\u003ch3\u003e\u003cstrong\u003eProduct Overview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRET521\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e(Part Number\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1MRK001530-AE\u003c\/strong\u003e) is a high-performance, multi-functional terminal within ABB’s prestigious\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRelion®\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eseries, specifically engineered for the comprehensive protection and management of power transformers. Designed for both utility substations and heavy industrial power networks, the\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRET521\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eserves as a centralized safeguard, integrating high-speed differential protection with advanced voltage regulation. This terminal is built to handle the complexities of multi-winding transformers, providing the deterministic logic required to manage on-load tap changers (OLTC) while maintaining absolute system stability. Its rugged construction ensures reliable performance in \"Challenging Conditions,\" effectively shielding critical infrastructure from electrical faults and operational irregularities.\u003c\/p\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eModel Designation:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRET521\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eABB Global ID:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1MRK001530-AE\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eProduct Series:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eRelion® Protection and Control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePrimary Protection Functions:\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cul class=\"list-paddingleft-2\"\u003e\n\u003cli\u003e\n\u003cp\u003eHigh-speed Transformer Differential Protection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMulti-stage Overcurrent and Earth Fault Protection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecision Voltage and Frequency Supervision\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIntegrated Control Logic:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eAutomatic Voltage Regulation (AVR) for On-Load Tap Changers\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSafety Features:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eBuilt-in Trip Circuit Supervision (TCS)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThermal Operating Range:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e-25°C to +55°C (-13°F to 131°F)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHumidity Tolerance:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e5% to 95% RH (Non-condensing)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCompliance Standards:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eIEC Certified (Electromagnetic Compatibility \u0026amp; Safety)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003ePhysical Dimensions:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e329 mm x 260 mm x 270 mm\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eNet Weight:\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003e5.0 kg (11.0 lbs)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTotal Transformer Asset Protection\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eRET521\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a \"Complete Defense\" system for high-value power assets. By combining differential protection with earth fault and overcurrent monitoring, the terminal provides 360-degree coverage against internal winding faults and external system surges. The integrated voltage regulation feature is a critical efficiency driver; it automatically manages the tap changer positions to maintain a stable output voltage under varying load conditions, significantly reducing mechanical wear on the transformer and improving downstream power quality. Its heavy-duty 5 kg chassis is built to minimize mechanical resonance and provide superior shielding against the high electromagnetic fields common in substation environments.\u003c\/p\u003e","brand":"ABB","offers":[{"title":"Default Title","offer_id":44096085753955,"sku":"RET521 (1MRK001530-AE)","price":180.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0549\/2775\/3315\/files\/298.png?v=1775034673","url":"https:\/\/precisemodule.com\/products\/abb-ret521-1mrk001530-ae-transformer-protection-terminal","provider":"Precise Module Ltd.","version":"1.0","type":"link"}