OK, just so you know. They are thermal breakers, so their internal characteristics might change with time
5 & 7-amp breakers are still available from Defender Marine & other marine supply houses. I use 5's on all circuits but one where I often run 3 or more locos; that's 7.
I recently replaced a KW with a Powerhouse 180; it appears the Powerhouse's breaker opens on derailment before an external 5 amp.