Expandable Module to TOWERMAX-KSU 70v Protection * Protects up Two 4-Wire Digital Station Lines * 1 Set per Jack * Protects Pins 3,4,5,6 on a RJ11/RJ45 Jack RJ11/45 Compatible * For Digital Ring thru Voltage, will not Protect Analog Voltage * Catastrophic Fuse Installs with just 3 Screws to any TOWERMAX Module * Auto Resetting Solid State Sneak Current Protection * UL/CSA Replaces GUM0570, PEC 8310-011 Lucent Comcode:407568161