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Device for indicating a destroyed arrester

  • US 5,805,070 A
  • Filed: 09/18/1996
  • Issued: 09/08/1998
  • Est. Priority Date: 04/12/1994
  • Status: Expired due to Term
First Claim
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1. A device for registering the malfunction of an overvoltage protective device for telecommunications equipment, wherein abnormal heating of a protective device causing risk of damage releases parts of a spring element, whereby the protective device and a signal circuit are connected to earth, wherein the spring element includes a main failsafe spring and an alarm spring which are mutually separated by meltable material when in a tensioned state and in electrical contact with an earth-connected center pin on the protective device, and when in a released state, in which the springs are released from said tensioned state due to the melting of said meltable material, the springs are also in electrical contact with a device mounted terminal pin and a rail or bar, said device-mounted terminal pin and said rail or bar being connected to earth when in said released state.

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