The DUR75120W is a MOV-Based Surge Protective Device (SPD) manufactured by Littelfuse. It is a type 1 device that is designed to protect against both AC power surges and lightning strikes. The device features two 1/2 inch x 20 mm components, with an Operating Voltage of 75 VAC and an Impulse Voltage of 100kV. It also has an Impulse Discharge Current of 4kA, a Dielectric Strength of 4kV, and an Impulse Discharge Duration of 8ms. The device is UL 1449-Listed and UL recognized, is RoHS compliant, and is suitable for Class II applications.