Phoenix Contact 2910330 The UL recognized type 1 Surge Protection Device (SPD) and IEC type 2 surge protector plug, featuring a varistor and thermal disconnect, is designed to be used with VAL-US base elements, providing an added layer of safety through mechanical and visual fault warnings.,Phoenix Contact 2910330 The UL recognized type 1 Surge Protection Device (SPD) and IEC type 2 surg