The LPXTRJ11-1F surge suppressor is a high-current, solid-state device designed to protect equipment from transient over-voltages on telephone lines with RJ-11 connectors using pins 3 and 4. It performs this function by limiting the magnitude of transient over-voltages that are present on the pair relative to each other and from each relative to ground. Continuous bi-polar, bi-directional, non-interrupting protection is provided. The LPXTRJ11-1F utilizes silicon junction avalanche suppressor diodes as its sole suppression technology and automatically resets after each suppression function with no degradation of protection capabilities.

The LPXTRJ11-1F attaches in series with the load to be protected. It is also equipped with a 12" wire for the purpose of attaching the device to the system GND (required for proper suppression).