"HEF990U (MCCB, 1600A, 70KA Icu, Adjustable Thermal 0.4 - 1 In, Adjustable Magnetic 2.5 - 10 In) The HEF990U is a 1600A heavy-duty molded case circuit breaker, engineered for high-power industrial and energy-intensive applications. With an interrupting capacity (Icu) of 70KA, it provides exceptional protection against extreme fault currents and overload conditions. The adjustable thermal protection from 0.4 to 1 In allows precise circuit control, while the adjustable magnetic trip range from 2.5 to 10 In ensures optimized fault detection and rapid circuit interruption. This MCCB is perfect for large-scale power grids and industrial facilities, guaranteeing uninterrupted operation and enhanced electrical safety."