CR2L-300 is a barrel-shaped super rapid fuse manufactured by Fuji Electric, specifically engineered to provide protection for silicon diodes, thyristors, and semiconductor circuits in inverters and transformer-rectifier applications. The fuse is rated for 300A at 250V AC and features a maximum interrupting I²t of 38 (Amp²×sec.) × 10³, with a peak arc voltage not exceeding 500V, ensuring minimal damage to related electrical equipment during fault conditions. Its small total I²t value delivers high-speed interrupting action against abnormal currents and destructive short-circuiting faults, making it ideal for semiconductor overcurrent protection. The fuse has an interrupting capacity of 100kA at 250V AC and a watt loss of 35W, providing reliable circuit isolation when semiconductors short or circuits fail.