RCCB AND MATHOD FOR SETTING SENSITIVITY CURRENT

摘要

PURPOSE: A RCCB(Residual Current Operated Circuit Breaker) and a sensitivity current setting method thereof are provided to set a sensitivity current by increasing or reducing the number of a secondary side coil of a zero current transformer. CONSTITUTION: A zero current transformer(200) detects the leakage current of an input power source(100). A trip unit(300) is connected to the zero current transformer. The trip unit closes and opens the connection of the line of the input power source according to the leakage current of the input power source. A switching unit(400) sets a sensitivity current according to a first current flowing in the line of the input power source. The switching unit is connected between the secondary side of the zero current transformer and the trip unit. The switching unit connects the zero current transformer and the trip unit by setting one among a plurality of tabs according to the size of a first current.