Patent ID: 7876181

Claim:
A circuit breaker for overcurrent protection and earth leakage protection, comprising: a zero-phase current transformer; an earth leakage detection circuit; a trip coil; a sensitivity current-switch; an action time switch; an earth leakage test switch; a circuit board having mounted thereon the earth leakage detection circuit, the sensitivity current-switch, the action time switch, and the earth leakage test switch; an earth leakage trip unit case having installed therein the circuit board having thereon the earth leakage detection circuit, the sensitivity current-switch, the action time switch and the earth leakage test switch; a main housing accommodating therein the earth leakage trip unit case, the zero-phase current transformer, and the trip coil; and an open-close operation handle, wherein the circuit board and the trip coil are combined, and the earth leakage trip unit case is disposed beside the open-close operation handle; wherein the earth leakage trip unit case comprises: a lower case accommodating the trip coil; an upper case disposed on the lower case and accommodating the circuit board; and a cover disposed on the upper case, wherein terminals of the circuit board, an end of the upper case and an end of the cover are extended adjacent to the zero-phase current transformer, and terminals of the zero-phase current transformer and the terminals of the circuit board are electrically connected.