Our Surge Power Protection Telephone 66 Block CPM-2PLUS prevents cable and equipment damage due to "sneak currents" (continuous foreign current levels exceeding 0.350 amperes). Sneak currents are not high enough to trigger over voltage protectors but can pose fire hazards and cause damage to sensitive electronic equipment. They may be caused by direct or indirect contact with power lines, a low impedance connection to earth ground, or by a short circuit somewhere on the line.

Each Current Protection Module contains two fuses in a clear plastic carrier. They are installed across two adjacent pairs of 66 quick clips, establishing solid contact with the clips. When the module is activated, the fuse opens, cutting off the flow of excessive current, preventing fire risk and shock hazards on data and voice transmission lines.

The modules are side- and end-stackable, allowing up to 50-pair protection on a standard M1-100 block or 25-pair protection in a standard M1-50 block. Use Siemon part number TP-4P (see below) to test block wiring without removing the protection module. Also use the TP-4P to easily extract CPM-2PLUS modules from the block. Red plastic caps are available to designate priority circuits.