Switches are designed for operation in electrical installations with a voltage of up to 660 V AC at a frequency 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. VA52-41 – current-limiting (application category A), with electromagnetic release. VA53-41 - current-limiting (application category A), with electromagnetic and electronic release. VA55-41 – selective (application category B), with electronic release. VA56-41 – without maximum current release.