Metal oxide varistor module
First Claim
1. A module for protecting an electrical device against transient surges from a power source, comprising a module placed in parallel with said power source and said electrical device, said module having a first contact plate for connecting to a power source;
- a second contact plate for connecting to an electrical device;
interposed sequentially between said first and second contact plates, a stationary varistor plate having a selected current and a temperature, an intermediate conductive layer, and an insulating plate; and
disconnect means for electrically connecting and disconnecting said first and second contact plates having a temperature and a current proportional to said temperature and current of said varistor and being responsive to temperature or current increases within said disconnect means for electrically disconnecting said first and second contact plates when said temperature of said disconnect means exceeds a predetermined temperature limit being less than the melting temperature of said varistor, and for electrically disconnecting said first and second plates when said current of said disconnect means exceeds an appointed current limit being less than the maximum current tolerated by said varistor.
1 Assignment
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Accused Products
Abstract
A metal oxide varistor module, and variations thereof for use in surge protectors and the like combining internally a thermally activated disconnect means and an excessive current disconnect means, such that when the module is subject to excessive overvoltage or overcurrent conditions, the connection is interrupted from the phase to neutral, phase to ground and any other combination of voltage or current before the metal oxide varistor device is physically damaged, ruptured or cracked.
82 Citations
36 Claims
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1. A module for protecting an electrical device against transient surges from a power source, comprising a module placed in parallel with said power source and said electrical device, said module having a first contact plate for connecting to a power source;
- a second contact plate for connecting to an electrical device;
interposed sequentially between said first and second contact plates, a stationary varistor plate having a selected current and a temperature, an intermediate conductive layer, and an insulating plate; and
disconnect means for electrically connecting and disconnecting said first and second contact plates having a temperature and a current proportional to said temperature and current of said varistor and being responsive to temperature or current increases within said disconnect means for electrically disconnecting said first and second contact plates when said temperature of said disconnect means exceeds a predetermined temperature limit being less than the melting temperature of said varistor, and for electrically disconnecting said first and second plates when said current of said disconnect means exceeds an appointed current limit being less than the maximum current tolerated by said varistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
- a second contact plate for connecting to an electrical device;
Specification