Applicable to the indoor environment with the AC 50Hz or 60Hz, and the rated working voltage of 440V at temperature usually no more than 35℃ and occasionally up to 60℃. They are used for protecting circuit breakers, switches, sockets and other electrical accessories from external impacts (such as mechanical shock, invasion of liquid substances). They are widely used in the electrical accessory housing of fixed electrical installation in the domestic and construction applications.
