... more humidity time,the average T is ≤+25°c. operation and maintenance:1,HPZ1 combination series,after fixed or operated ... be cutted and closed flexible;3,when the mini circuit breaker,earth leakage circuit breaker and other breakers breakdown,must be find out the ... shoulf be exchanged;4,If it has installed earth leakage circuit breaker terminal combination electric,should be tested twice every month;If ...