TRANSTECTOR's I2R-75KY480 277/480 VAC, three-pole, three-phase wye surge protection device (SPD). Network safety and reliability are built into the I2R 75K series. Engineered using patented safe-fail self-protection design, the I2R SPD couples a high short circuit rating with thermally protected metal oxide varistor (MOV), which eliminates the need for additional overcurrent protection devices. The I2R-75KY480 combines a robust 75 kA surge capacity that also eliminates back-up fusing requirements thus providing network operators with a quick to install, safe, and reliable solution for 277/480 VAC applications.