Patent ID: 6812713
Filing Date: 2004-11-02
Classification: G01L,H01F,H01H,H02H

Abstract:
A fault indicator for indicating the occurrence of a rapid pressure surge within a housing of an electrical device, the fault indicator comprising:a) a barrel capable of being mounted in an opening in a housing of an electrical device; b) an actuating mechanism comprising: i) a chamber within the housing, the chamber having at least one orifice communicating between interior and exterior surfaces of the chamber; and, ii) an actuating member movable in responses to a pressure differential between the interior and exterior surfaces of the chamber; and, c) a plunger within a bore of the barrel, the plunger biased outwardly in the barrel and normally retained in an armed position by the actuating member; wherein, when the pressure differential exceeds a positive threshold value, the actuating member is moved and thereby permits the plunger to move outwardly in the bore to a triggered position.