Importance

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Abstract

A surge suppressor disconnect protection circuit is coupled to a first surge suppressor electrically coupled to the terminals of an AC source to protect the first surge suppressor from predetermined overvoltages. The circuit includes a relay switch connected in series with the first surge connected to the AC source terminals for rectifying the AC to generate a DC signal. The adjuster filters the DC signal and scales the filtered DC signal. An amplifier is electrically coupled to the adjuster and to and providing a difference signal integrator time constant is electrically connected to the amplifier and produces a signal which is proportional to a length of time the scaled DC signal is greater than the first voltage reference. A comparator is connected to a second voltage reference. The comparator output is electrically coupled to the relay switch which opens the switch contact to set it to a high impedance state when the integrator output signal exceeds the second voltage reference.

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First Claim