PURPOSE: To repeatedly count the number of erroneous operations due to noise in an automatic manner by separating a breakage signal output from a control circuit of an electric leakage breaker of an object to be tested from a breakage circuit, and inputting the signal into a counter.

CONSTITUTION: In the case where the number of erroneous operations due to noise of a surge voltage or the like from a main electric circuit in a real field is counted, the noise is applied to an electric leakage breaker 10 from the main electric circuit 12 in the real field, and a breakage signal is output when the magnitude exceeds a predetermined value. Namely, the breakage signal due to the erroneous operation is output from output terminals K, L of a control circuit 2, and the signal is applied to a counter 9 through a transistor 8. The counter 9 counts the number of the erroneous operations and displays it. A breakage circuit 6 cannot be operated since the breakage signal is separated from the breakage circuit 6 so that the circuit 12 is not cut off. Consequently, the number of the erroneous operations due to the noise can be repeatedly in an automatic manner. As a result, a cumbersome manual ion can be eliminated, and further, counting accuracy can be improved.