Mersen A50P semiconductor protection fuse with bolt-in mount. Amp-Trap Form 101 semiconductor protection fuses were developed for DC drives, uninterruptable power supplies and similar applications requiring better protection (lower I2t) and superior reliability. The A50P is typically used for replacement. Low I2t minimizes damage to protected components on short circuit. Controlled arc voltage reduces stress to circuit components during fuse clearing. Choice of mounting types helps in equipment design. Highlights: very fast acting, current limiting, low I2t, indicator options available. Applications: protection of DC drives, UPS and other equipment of 500 volts or less. Approvals: UL Recognized Component UL File 60314. AC: UL Guide No. JFHR2 (10-800A). DC: UL Guide No. JFHR2 (35-800A). Measures 1-1/2-inches diameter by 4-11/32-inches length.