Eaton Corporation

Thomas Edward Strunsee

Jerome Kenneth Hastings

James E Hansen

Birger Pahl

David J Gritter

Edward Louis Wellner

Engelbert Hetzmannseder

Scott A Reid

William Edward Berkopec

Karen Sjaarda Bland

Electrical equipment is safeguarded from damage due to faults by a circuit that provides several levels of protection. A semiconductor switch and a current sensor are placed in series with the electrical equipment. When the current to the equipment exceeds a first threshold for a predefined period of time, the semiconductor switch is rendered non-conductive until the circuit is specifically reset. When the current to the equipment exceeds a greater second threshold, a pulsed signal alternately places the semiconductor switch in conductive and non-conductive states so that the average current applied to the equipment is within an acceptable level. Should the current exceed an even greater third threshold, the semiconductor switch is immediately rendered non-conductive until the circuit is manually reset.

Soild state protection circuit for electrical apparatus

Growing community of inventors

Milwaukee, WI, United States of America

Thomas Edward Strunsee