The SOHO series is a line of transient surge protection devices which are designed to provide protection for sensitive electronic equipment using single phase AC supply voltage 220/230/240V.

Electronic equipment is extremely susceptible to transient voltages and surge currents due to its relatively fragile semiconductor construction. AC supply lines, by their very nature of being a power carrier, interconnect industrial, commercial, and residential areas, buildings, and equipment. Every load being switched on or off creates some sort of electrical noise and voltage fluctuation. These transients and surges are then carried through the supply lines to all of the other loads in the vicinity. As the transients and surges increase in level, their destructive power is carried further in distance thereby reaching more sensitive electronic equipment.

Every electronic device connected to the AC supply lines should have protection against these transient voltages and surge currents to ensure a longer service life.

The transient surge protection devices have three stages of protection. The SOHO have a line side which is connected to the AC supply LIVE, NEUTRAL & Ground, and an outlets side which connects to the equipment that is to be protected. All destructive voltages and currents are absorbed into an EARTH connection. This EARTH connection must go to a proper earth ground point using low impedance heavy gauge wire.