Patent ID: 6947266
Filing Date: 2005-09-20
Classification: H02H

Abstract:
1. A power protection device comprising: line, neutral, and ground terminals on a supply side of said device for connection to line, neutral, and ground terminals, respectively of an electrical supply system, line, neutral, and ground terminals on a load side of said device for connection to line, neutral, and ground terminals, respectively of one or more pieces of electronic equipment, an EMI filter and suppressor cooperating in combination between said supply side and said load side and cooperating with an electronically controlled relay circuit comprising a relay control circuit means and relay means adapted to conduct power to said load side and the connected equipment only if the supply system is correctly wired, and the line voltage is generally within twenty-five percent of nominal levels, and a backup to an over-voltage response of said relay means, said relay control circuit means including at least one thermal cut-off positioned adjacent to at least one metal-oxide varistor whereby heating of said at least one metal-oxide varistor due to continued operation triggers tripping of said at least one thermal cut-off thereby causing disconnection of power to the device load side and connected equipment, wherein each thermal cut-off of said at least one thermal cut-off is shunt connected so as to not carry connected equipment load currents.