Surge protection device
First Claim
1. A method of surge protection for an electrical power cord, comprisingcoupling a phase conductor and a neutral conductor of the electrical power cord with a first surge protection device;
- coupling the neutral conductor and a ground conductor of the electrical power cord with asecond surge protection device; and
disposing a low temperature thermal cutoff device in series with the second surge protection device,wherein the cutoff temperature of the low temperature thermal cutoff device is lower than the thermal cutoff temperature of a first thermal cutoff device.
1 Assignment
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Accused Products
Abstract
A surge suppression circuit with a thermal cutoff includes a first surge suppressor in series with a first thermal cutoff device between a phase conductor and a neutral conductor. A second surge suppressor in series with a second thermal cutoff device is between the phase conductor and a ground conductor. A third surge suppressor is in series with a low temperature thermal cutoff device between the neutral conductor and the ground conductor. The thermal cutoff temperature of the low temperature thermal cutoff device is lower than the thermal cutoff temperature of the first thermal cutoff device.
29 Citations
24 Claims
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1. A method of surge protection for an electrical power cord, comprising
coupling a phase conductor and a neutral conductor of the electrical power cord with a first surge protection device; -
coupling the neutral conductor and a ground conductor of the electrical power cord with a second surge protection device; and disposing a low temperature thermal cutoff device in series with the second surge protection device, wherein the cutoff temperature of the low temperature thermal cutoff device is lower than the thermal cutoff temperature of a first thermal cutoff device. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A surge suppression circuit with a thermal cutoff comprising:
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a phase, a neutral and a ground terminal for providing an electrical path between a power source and a load; a first surge protection circuit electrically connected across the phase and neutral terminals to provide a first electrical path, the first surge protection circuit comprising a first surge suppressor connected in series with a first thermal cutoff device; a second surge protection circuit electrically connected across the neutral and ground terminals to provide a second electrical path, the second surge protection circuit comprising a second surge suppressor connected in series with a second thermal cutoff; and a low thermal cutoff thermal cutoff electrically connected in series with the second surge protection circuit, wherein the low thermal cutoff thermal cutoff has a thermal cutoff temperature that is lower than a thermal cutoff temperature of the first thermal cutoff, the low thermal cutoff thermal cutoff detects when the temperature of the first surge suppressor exceeds the thermal cutoff of the low thermal cutoff thermal cutoff caused by leakage current flowing through the first electrical path as a result of an over-voltage condition across the phase and neutral terminals, and the low thermal cutoff thermal cutoff opens the second electrical path preventing the leakage current from flowing through the second electrical path while still providing the electrical path between the power source and load. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A surge suppression circuit with a thermal cutoff comprising:
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a first surge protector coupled between a phase conductor and a neutral conductor; a second surge protector coupled between the phase conductor and a ground conductor; and a third surge protector in series with a low temperature thermal cutoff device, wherein said series combination of the third surge protector and the low temperature thermal cutoff device is coupled between the neutral conductor and the ground conductor and wherein the first surge protector comprises a first surge suppressor in series with a first thermal cutoff device; the second surge protector comprises a second surge suppressor in series with a second thermal cutoff device; and the third surge protector comprises a surge suppressor and a third thermal cutoff device, wherein the cutoff temperature of the low temperature thermal cutoff device is lower than the thermal cutoff temperature of the first thermal cutoff device. - View Dependent Claims (22, 23, 24)
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Specification