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The Line Protection Unit developed by Cologicx is a State of the Art Technology product to protect Telephone Exchange/ EPABX Line circuits against Lightning, Over voltage, Over current and 230 volts AC Mains power contact. The Line Protection Unit (LPU) is a SOLID STATE, SELF-RESETTING, QUICK ACTING Protection Module comprising 10 nos. of Line Protection Circuits per Unit.

The protection circuit comprises two major components for Over Current (OC) and Over Voltage (OV). The nominal 'on state' resistance of OC device is of the order of 4 to 8 ohms which goes up to a few mega ohms when excess current flows through the loop/circuit. The OC device returns to normal after the line condition is restored. The Over Voltage device connected in parallel provides low impedance to high voltages beyond the rated voltage on a phone line (typical 250 V AC). This device can handle as high as 1000 Amperes short-term short circuit current (as per ITU-T K.21 standards). The Over Voltage device withstands Lightning voltage: 1.5KV - 36 KV with different wave-shapes. Lightning current: Up to 1000 Amperes with different wave-shapes (as per the ITU-T K.44 standards).