The P/N 2075 Power Buss is an electronic device that provides 12 volt DC overload monitoring and protection for 18 electrical circuits. The Power Buss also monitors (high amperage) generator supply and landing gear actuator circuits.
Protection is provided by 18 solid-state PTC current limiters that automatically remove power when a circuit becomes overloaded. Just as mechanical circuit breakers can be reset, the PTC can be reset if power to the PTC, or the load (or service) supplied by the PTC is manually shut off for approximately 15 seconds.

Monitoring is provided by a red warning light (that includes the function of a momentary push switch) and an electronic voice annunciator system that provides an audio identification of the overloaded circuit through a built in speaker. Voice warnings can also be output into the pilot’s headset.

The Power Buss includes an avionics buss that automatically removes power from sensitive avionics systems during engine start. Although there is provision for an avionics master switch, the built-in power down function reduces this requirement.

Weighing only 13 oz. and self-contained the Power Buss module can be mounted anywhere behind the panel with only the warning light visible in the cockpit. Interconnect is made by quick connect terminals. The system’s 18 PTC’s provide an economical replacement for heavy circuit breakers. The sophisticated electronic audio alert system removes the requirement for a separate (difficult to read and interpret) circuit display module. On power up the Power Bus automatically tests all circuits. Pressing the red warning light also tests the system with a “Test OK” annunciation.