Transformers, wires and welded materials may be damaged if an abnormal energization
occurs exceeding the energization cycles that are set for the inverter welding machine. It is not possible to protect against the abnormal energization with general overload protective device since the operating time is much longer than setting energizing time of welding machine. Earth Leakage Circuit Breaker for inverter welding machine can protect against the abnormal energization in addition to earth leakage and short-circuit ,and it can set the time according to energization time of welding machine (If timer function is not necessary, it is possible to use general Earth Leakage Circuit Breaker).