Switches are designed for operation in electrical installations with a voltage of up to 660 V AC at frequencies of 50 and 60 Hz and up to 440 V DC for infrequent switching of electrical circuits, as well as for protecting electrical equipment from overloads and short circuits. The series is designed for rated currents up to 2000 A. Depending on the type of current and voltage magnitude, it has a breaking capacity of up to 135kA. VA53-43 - current-limiting (application category A), with electromagnetic and electronic releases. VA55-43 – selective (application category B), with electronic releases. VA56-43 – without maximum current releases.