TRANSTECTOR's I2R-75KY220 127/220 VAC, three-pole, three-phase wye, modular surge protection device (SPD). The I2R-75KY220 couples a high short circuit rating with thermally protected metal oxide varistor (MOV), which eliminates the need for additional overcurrent protection devices. Each modular I2R 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 product set for AC network surge protection.