ZnO varistor, silicon rubber housing
certification:ISO9001
automatically disconnect to protect the system from further damage

Technical  Parameter:

Normal service conditions:
The ambient air temperarture is no higher than +40 degree. no lower than -40 degree.
The altitude above sea level does not exceed 2000m
Power frequency 48Hz~62Hz
Maximum wind speed does not exceed 35m/s

The earthquake intensity does not exceed 7 degrees

The voltage that long-time exerted shouln't exceed its Max MCOV

more pictures: