Is STO.P like a Surge Suppressor that is used on the AC Mains?
A. No! ‘Surge Suppressors’ clamp damaging voltages from anomolies such as lightning strikes to power poles which cause very high voltages to travel along the line and enter AC mains connected equipment. These devices ‘limit’ high voltage surges to 750 Volts or more! They do not work very well on low voltage DC powered equipment. STO.P, on the other hand, works on low voltage DC systems. It stops spikes and transients that are as low as 18 volts! It if far more complex than normal AC mains ‘Surge Suppressors’ too!