An earth leakage circuit breaker comprising: a trip coil configured to generate an electromagnetic force for tripping a circuit; a detection unit configured to detect an earth leakage signal in the circuit; a signal generation unit configured to generate a determination signal by tracking the earth leakage signal; wherein the signal generation unit comprises a charging and discharging circuit, and wherein the determination signal is generated when an output signal (Vch) of the charging and discharging circuit tracks the earth leakage signal, and a controller configured to determine whether the earth leakage signal includes noise or not by comparing the determination signal with a reference signal, and configured to control an operation of the trip coil according to a result of the determination, characterized in that the signal generation unit comprises: a first voltage discriminator configured to charge the charging and discharging circuit, by comparing the earth leakage signal and the output signal of the charging and discharging circuit respectively with a first reference voltage; a second voltage discriminator configured to compare the output signal of the charging and discharging circuit with the earth leakage signal and a second reference voltage, and to generate a signal according to a result of the comparison; a pulse generator configured to generate a determination signal by generating a high pulse or a low pulse, based on the signal according to a result of the comparison of the second voltage discriminator; and configured to apply the thus generated high pulse or low pulse to a switch; said switch being connected to the charging and discharging circuit, and configured to discharge the charging and discharging circuit by being opened when the high pulse is applied thereto from the pulse generator, and the switch being configured to charge the charging and discharging circuit by being closed when the low pulse generated is applied thereto from the pulse generator, wherein the output signal is fed-back to the second voltage discriminator until tracking the earth leakage signal is completed. a trip coil configured to generate an electromagnetic force for tripping a circuit; a detection unit configured to detect an earth leakage signal in the circuit; a signal generation unit configured to generate a determination signal by tracking the earth leakage signal; wherein the signal generation unit comprises a charging and discharging circuit, and wherein the determination signal is generated when an output signal (Vch) of the charging and discharging circuit tracks the earth leakage signal, and a controller configured to determine whether the earth leakage signal includes noise or not by comparing the determination signal with a reference signal, and configured to control an operation of the trip coil according to a result of the determination, characterized in that the signal generation unit comprises: a first voltage discriminator configured to charge the charging and discharging circuit, by comparing the earth leakage signal and the output signal of the charging and discharging circuit respectively with a first reference voltage; a second voltage discriminator configured to compare the output signal of the charging and discharging circuit with the earth leakage signal and a second reference voltage, and to generate a signal according to a result of the comparison; a pulse generator configured to generate a determination signal by generating a high pulse or a low pulse, based on the signal according to a result of the comparison of the second voltage discriminator; and configured to apply the thus generated high pulse or low pulse to a switch; said switch being connected to the charging and discharging circuit, and configured to discharge the charging and discharging circuit by being opened when the high pulse is applied thereto from the pulse generator, and the switch being configured to charge the charging and discharging circuit by being closed when the low pulse generated is applied thereto from the pulse generator, wherein the output signal is fed-back to the second voltage discriminator until tracking the earth leakage signal is completed. a first voltage discriminator configured to charge the charging and discharging circuit, by comparing the earth leakage signal and the output signal of the charging and discharging circuit respectively with a first reference voltage; a second voltage discriminator configured to compare the output signal of the charging and discharging circuit with the earth leakage signal and a second reference voltage, and to generate a signal according to a result of the comparison; a pulse generator configured to generate a determination signal by generating a high pulse or a low pulse, based on the signal according to a result of the comparison of the second voltage discriminator; and configured to apply the thus generated high pulse or low pulse to a switch; said switch being connected to the charging and discharging circuit, and configured to discharge the charging and discharging circuit by being opened when the high pulse is applied thereto from the pulse generator, and the switch being configured to charge the charging and discharging circuit by being closed when the low pulse generated is applied thereto from the pulse generator, wherein the output signal is fed-back to the second voltage discriminator until tracking the earth leakage signal is completed.