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2019General Discussion forum

Replacement circuit breakers for GPI Pro sled power distribution systems

What the thread found

  • GPI Pro style pop-up breakers are Klixon breakers available from aircraft parts suppliers such as Aircraft Spruce and Peerless Electronics.
  • The Klixon 7277-2 series breakers are used in GPI Pro sleds, with the final digit indicating amperage rating.
  • Klixon breakers operate as slow-blow type circuit protectors that tolerate temporary overcurrent for several seconds before tripping.
  • Klixon breakers may not trip during a direct short circuit across battery terminals, as internal battery protection typically cuts power before the breaker responds.
  • The slow-blow characteristic of Klixon breakers means they require sustained overload at many times their rated amperage for several seconds to trip.

Depends on

  • The actual protection strategy and design intent of these breakers in GPI Pro sleds was not definitively explained in the thread.
  • Testing was limited to specific battery types and short circuit scenarios.
  • No confirmation was provided by GPI Pro manufacturer regarding proper application and protection philosophy.
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