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.