7-54 P/N 13999-002 Info Manual
Section 7 Cirrus Design
Airplane Description SR20
Circuit Breakers and Fuses
Individual electrical circuits connected to the Main, Essential, and
Non-Essential buses in the airplane are protected by re-settable circuit
breakers mounted on the left side of the center console. The airplane
Essential bus is supplied from the Main Buses through the 20-amp
ESSENTIAL 1 and ESSENTIAL 2 circuit breakers. Avionics loads on
the Non-Essential Avionics Bus and Essential Avionics Bus are
protected by 15-amp AVIONICS circuit breakers connected to the
respective bus through relays energized by the AVIONICS switch.
In addition to the individual circuit breakers, 25-amp fuses located on
the primary bus in the Master Control Unit (MCU) protect the Main Bus
1, Main Bus 2, and the Non-Essential Bus. Additionally, 15-amp fuses
protect the landing light and standby vacuum pump circuits. The clock
is continuously powered through a 5-amp fuse connected to the
primary bus in the MCU.
Ground Service Receptacle
A ground service receptacle, located just aft of the cowl on the left side
of the airplane, is installed to permit the use of an external power
source for cold weather starting and maintenance procedures
requiring reliable power for an extended period. The external power
source must be regulated to 28 VDC. The external power control
contactor is wired through the BAT MASTER switch so that the BAT
MASTER must be 'on' to apply external power.
Refer to Section 8, Ground Handling, Servicing, and Maintenance, for
use of external power and special precautions to be followed.
Convenience Outlet
A 12-volt convenience outlet is installed in the center console. The
receptacle accepts a standard cigarette-lighter plug. The outlet may be
used to power portable entertainment equipment such as CD players,
cassette players, and portable radios. Amperage draw through the
outlet must not exceed 3.5 amps. 28 VDC power for the convenience
outlet is supplied through the 5-amp CONVENIENCE POWER circuit
breaker on the Non-Essential Bus and reduced to 12 volts by a power
regulator card in the console.
September 2011
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