FIELD: electrical engineering.
SUBSTANCE: proposed OFF-operation device has case, two fixed contacts, movable contact, regulating mechanism incorporating operating mechanism for setting movable contact in motion toward fixed contact, and disconnecting facility for selective disconnection of fixed contact from movable ones. Novelty is that operating mechanism has lever hinged to case and provided with hub whose section is visible from outside of case; this section has condition indicator visible on case outer surface when lever is in original position and closed with case when lever is positioned so that movable contact is applied to fixed contacts or approaches them.
EFFECT: provision for protecting electric circuits including power circuits.
15 cl, 12 dwg
