Panamax ITW DS25 Towermax Module The ITW Linx Towermax DS/25, MDS25, is an add-on module for the Towermax 4 or 8 KSU base modules. The ITW MDS25 allows you to protect 25 2-wire digital stations, or 12 4-wire digital stations, using RJ-21X (Amphenol) connectors (male in/female out). The Towermax DS/25 will not protect analog voltage. The unit features auto-resetting technology, PTC resistors open when a surge occurs, but once the surge has passed, they close again! The ITW Linx MDS25 measures 4.25" X 4.25" X 1.5". The unit protects pins 1-50 (25 pair), and is UL/CSA approved. The clamping level is 110V, and capacitance is about 50pf. Features: Auto-resetting technology: PTC fuses respond in 1 to 5 nanoseconds $50,000 protected equipment warranty, Lifetime product warranty Dimensions: 4.25"H x 4.25"W x 1.5"D Weight: 1 lb UL 497A approved Panamax DS/25