The Only Safe Replacement FAA PMA Circuit Breaker Switches

Williams Air Parts is your source for Replacement Circuit Breaker Switches (CBS) for Beechcraft and Cessna aircraft for the safest option to the circuit breaker switch problem.

All old and new Beechcraft circuit breaker switches, and old and new Tyco circuit breaker switches have the same fatal flaw, everyone of these switches causes the braided wire to fatigue and fail over time.

If the CBS fails open, the current then goes through the arm, through the spring and onto the load bar. The newer Beech Circuit Breaker Switches and Tyco Circuit Breaker Switches have solved the fail open problem by insulating the spring. However, many of these switches have failed closed, or shorted (in all types of aircraft). When the braid breaks off the CBS and closes the buss input to the load bar, it renders the switch ineffective, and uncontrolled electricity goes through that circuit. What follows is smoke, sparks, and ultimately fire.

At this point you have one option:
  • Use Williams Air Parts FAA-PMA circuit breaker switches.

The Williams Air Parts Replacement Circuit Breaker Switch does NOT have a braided wire. This safer switch will NOT short. The Williams Air Parts CBS is designed so that wires never move and therefore do not fail from fatigue.

Look at the the burned up New Beech circuit breaker switch.  Then look at the Williams Air Parts Replacement Circuit Breaker Switch (see Our Parts) and compare to the old and new Beech switches (see Beechcraft) and Tyco switches (see Cessna). See how these cause the braided copper wire to break.