Function and Applications

Residual current circuit breakers are used for personal protection and switch off a circuit when a fault current is detected, which flows through the protective earthing (PE). This RCD tester determines the tripping current and the tripping time of residual current circuit breakers which are used in every new building according to current building regulations.

The various selectable test currents and characteristics of the FI allow flexible use of this instrument.

FI testers allow a fault current to flow and determine at which fault current the FI reacts. Furthermore, the trip time is measured. These two parameters tripping current and tripping time are the safety-relevant characteristics of a residual-current-operated switch.