Fast-acting, indicating semiconductor fuses open within seconds of being exposed to overloads and short circuits. Also called fast-blow semiconductor fuses, they are highly sensitive to changes in current flow and don't tolerate temporary overload currents or power surges. They have a visual indicator to make it easier to identify blown fuses for replacement. Semiconductor fuses provide overcurrent protection at voltages below 300VAC for solid-state components such diodes and thyristors in variable-speed drives, power rectifiers, uninterruptible power supplies (UPSs), and other power electronics applications. Also known as rectifier fuses, they are extremely current-limiting to prevent electrical damage by disconnecting circuits before they're exposed to the full magnitude and duration of an overcurrent. This listing is for each. ECCN EAR99 Country of Origin HU - Hungary UNSPSC 39121625 Class Class aR Fuse Type High Speed Fuse Rated Voltage 2000V Shape Rectangular Fuse Amps 630A Length 1.6456 in. Height 2.087 in. Width 5.433 in.