... of leakage of electricity,overload,breakdown,protect and so on. HPZ1-F-1series is suitable for use in ... at the regular intervals;2,The handle of the on-off element should be cutted and closed flexible; ... be find out the reason,then only can switch on and operate;If it is the reason about element ... portNingbo or Shanghai10delivery timeabout 20~25 days(depend on your order)11sample timewithin 7 days