ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,548,994, issued on Feb. 10, was assigned to Schneider Electric USA Inc. (Boston).
"Ground fault interrupting system for HVAC equipment" was invented by Paul A. Reid (Cedar Rapids, Iowa) and Brett E. Larson (Cedar Rapids, Iowa).
According to the abstract* released by the U.S. Patent & Trademark Office: "A device and method are provided for interrupting power to a branch circuit and connected load. The device includes a first ground fault (GF) sensor for monitoring a first leakage current across line conductor(s) and grounding conductor of the branch, which ignores leakage current across the grounding conductor, and a second GF sensor for monitoring a second leakage current of the load...