UltraLinx 66 Block/100V Clamp/350mA Fuse- ITW Linx Ultralinx PBX/KSU protection - 66 Block - Solid-state - UL Listed Primary and Secondary Protector - 350mA Sneak current fuse - 100V Clamping - 2 LEDs to indicate Protection and Ground OK - Designed for Panasonic digital pho