Zero-phase current transformers
Features:
To precisely sense the minimal current so as to catch up the leakage current
Excellent load shift properties
Accurate output and exceptional linearity
Perfect shielding from DC shock
Applications:
Residual current devices
Earth leakage circuit breakers
Appliance leakage circuit interrupters
Ground fault interrupters
Toasters, instantaneous water heaters, hair dryers and others
Street lamps, traffic light systems, signboards and more
Commercial and industrial leakage breakers
Circuitry:
Both the line (hot) current and the neutral (white) current are run through the aperture of a transformer
The secondary current being exited by the differential (primary) current