Patent ID: 9411021
Filing Date: 2016-08-09
CPC Classification: G01R,H02H

Claim Text:
1. An apparatus, comprising: a leakage current sensor operating to measure leakage current from a source of AC power, which provides power to at least one load circuit; and a control circuit operating to: (i) receive a measured leakage current value from the leakage current sensor, (ii) compare the measured leakage current value against a plurality of predetermined thresholds to establish status therefor; (iii) provide a status output indicating the status of leakage current with respect to each of said plurality of thresholds; and (iv) automatically perform, in response to the existence of a predetermined condition when measured leakage current has been determined to be within a normal level, a self test to determine whether the leakage current sensor is operative and provide a status output indicating performance of said self test.