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Internal fault indicator for electrical equipment

  • US 9,188,500 B2
  • Filed: 06/07/2010
  • Issued: 11/17/2015
  • Est. Priority Date: 06/07/2010
  • Status: Active Grant
First Claim
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1. 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 aperture in the housing;

    (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 response to a pressure differential between the interior and exterior surfaces of the chamber;

    (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; and

    (d) a radial seal disposed between the plunger and the barrel so as to permit relative motion of the plunger and the barrel;

    wherein, when the pressure differential exceeds a positive threshold value, the actuating member is moved and thereby permits the plunger to move outwardly into a triggered position, and wherein the radial seal is sealingly engaged with both the plunger and the barrel in both the armed position and the triggered position.

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