towerMAX DS-25 from ITWLinx is a digital station set protector with Auto-Resetting Technology, which protects up to 25 2-wire digital station lines. The PTC resistors open when a surge occurs, protecting your equipment, but unlike other fuses, the PTCs close again once the surge passes. The unit offers expandable system protection using towerMAX Series Base Units. It also features Signal Perfect Circuitry for auto-resetting surge protection for data networks, telephone and coax lines with RJ-21X termination type.
Manufacturer part number: MDS25