noun
: an electric switch completely enclosed in a metal box with an external control handle and so designed that the box cannot be opened while the switch is closed and the switch cannot be closed while the box is open
noun
: an electric switch completely enclosed in a metal box with an external control handle and so designed that the box cannot be opened while the switch is closed and the switch cannot be closed while the box is open
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012