The reset circuit of a fault indicator is disabled to prevent automatic restoration of the movable target from fault indicating position where it can be observed and manually rest. A manually operable switch is connected across the reset ciruit and its contacts are closed by permanent magnet means or...http://www.google.fr/patents/US4034360?utm_source=gb-gplus-shareBrevet US4034360 - System for disabling the reset circuit of fault indicating means
System for disabling the reset circuit of fault indicating means
