I am assuming that this is why this SurgeX works, but I still don't really understand.
All electronic equipment has a power supply which charges-up when the power is first turned on. This causes a momentary inrush current which is typically five to ten times the normal operating current. Signal processing equipment and other low-power equipment will not individually have a problematic inrush current but, when several pieces of equipment are turned on simultaneously, there can be a large inrush. However, the real offenders are the big amplifiers, especially those with switching power supplies. Some amplifiers have inrush current limiting built-in but many do not. In the case of amplifiers with no limiting, the only thing that limits the inrush current is the resistance of the copper wire between the panel and the amplifier! Peak currents of 200 Amps have been measured with some amplifiers. Powering up even one of these amplifiers can blow a circuit breaker, and powering up two or three simultaneously almost certainly will. Relay and switch contacts can also eventually weld together when subjected to these huge inrush energies. SurgeX ICE® soft turn-on totally eliminates inrush current problems. You can connect as many pieces of equipment as you like to a SurgeX ICE® product (provided, of course, that the total load is not exceeded) and you never have to worry about the inrush current or the need to install expensive time-delay circuit breakers.