for multiphase applications, e.g. phase interruption

Full Title

Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection (specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems H02H7/00; systems for change-over to standby supply H02J9/00 ) > responsive to undervoltage or no-voltage > for multiphase applications, e.g. phase interruption