Adding "mini-fuses" to both the main motor & tail motor will protect the E-board from "smoke'n."
I found the mini-blade fuses at an auto parts store. I 've added a 5 amp to the tail, and a 18 amp to the main, (no holder, just soldered-on with heat-shrink tubing protection), although I no longer use the 3in1 board, it still protects the (2) ESC's from high current failure, if they don't have overload protection.
High current load on my main motor caused my 3in1 to "snap, crackle, & pop![&o]" Then the motor went up in a plume of smoke[X(]! I must say it was a cool effect at 20 feet!

Rick