HHB series inflatable cabinet uses environmentally friendly gas as arc extinguishing and insulating medium. Fully sealed and insulated. The busbars, switches and live parts are completely enclosed in the stainless cabinet. The whole is filled with environmental protection gas, of which the protection degree is IP67. The whole switchgear unit is completely free from the external environment, so the switch can also be operated normally even in the extreme case of short-term flooding.