Electrical circuit breaker planning 3

The breaker size is matched to the smallest AWG-dependent current limit of any one branch off a given breaker or split downstream of a breaker. Current limits are taken from Table 11-3 on page 11-15 in AC43-13-1B:

• 22AWG - 5A
• 20AWG - 7.5A
• 18AWG -10A
• 16AWG - 15A
• 14AWG - 20A
• 12AWG - 30A
• 10AWG - 40A
• 8AWG - 50A
• 6AWG - 80A
• 4AWG - 100A

Bat/Alt switch (progressive type)

"Avionics" switch (progressive type) which can select between the main bus and backup battery output, progressive type. The following are all on the "avionics" bus

• radio
• transponder
• flarm/backup EFIS
• flaps
• Elevator and Aileron Servo
• trim

IBBS backup input breaker 10A - Klixon 2TC2-10

IBBS backup output breaker 10A - Klixon 2TC2-10

IBBS charge breaker 7.5A - Klixon 2TC2-7.5

Breaker sizes inferred from the above table are overridden lower by any stated by Dynon, or by current limits of any interconnects

"Radio" breaker 20AWG 7.5A overridden by Dynon schematic 5A => Klixon 2TC2-5

• Com Radio control panel
• Com Radio

"Transponder" breaker 22AWG 5A overridden by Dynon schematic 5A => Klixon 2TC2-5

• Transponder
• ADS-B receiver

"Flarm/Backup EFIS" breaker 22AWG 5A overridden by Flarm manual 3A => Klixon 2TC2-5

• Flarm fusion
• Flarm trafficView80
• Kanardia Horis

"Flaps" breaker 20AWG 7.5A => Klixon 2TC2-7.5

"Elevator and Aileron Servo" switch (SPST) and separate breaker 20AWG lines (7.5A) with 22AWG at the motor (5A) combined into 18 AWG => Klixon 2TC2-7.5 (slight liberty)

"Trim" breaker 22AWG - 5A Klixon => 2TC2-5

"EFIS" switch (SPST) with separate breaker - 2x22AWG ~ 20 AWG 7.5A overridden by Dynon schematic 5A => Klixon 2TC2-5

"Interior" switch (progressive type) and dimmer with separate breaker - 22AWG 5A => Klixon 2TC2-5

The following are directly connected to the main bus: -

"USB" switch (SPST) and separate breaker - 18AWG 10A => Klixon 2TC2-10

"Landing Lights" switch (progressive type) with separate breaker (with 3rd position for wig-wag) 16AWG 15A overridden by Deutsche DT connect limit of 13A => Klixon 2TC2-10

"Taxi Lights" switch (SPST) with separate breaker 16AWG 15A overridden by Deutsche DT connect limit of 13A => Klixon 2TC2-10

"Nav/Strobe Lights" switch (2 separate SPST) with separate breaker 18AWG 10A => Klixon 2TC2-10

"Fuel pump" switch (SPST) with integral breaker - 3A => TE W31-X2M1G-3

Total:

14 separate breakers

Summary

7 x Klixon 2TC2-5

3 x Klixon 2TC2-7.5

6 x Klixon 2TC2-10

6 x AN3021-2 / MS35058-22 (SPST: on-none-off) - for most on/off switches

1 x MS35058-27 (SPDT: on momentary-off-on momentary) - for flap control

5 x MS25201-4 (Eaton 8860K4) progressive switch

16 breakers in all

12 switches in all

Summary

"bat/alt" SWITCHED (PROGRESSIVE) 

backup input breaker 10A - Klixon 2TC2-10

backup output breaker 10A - Klixon 2TC2-10

charge breaker 7.5A - Klixon 2TC2-7.5

The following can be switched as a group between the main bus and the backup output

• "Radio" breaker - Klixon 2TC2-5
• "Transponder" breaker - Klixon 2TC2-5
• "Flarm/Backup EFIS" breaker - Klixon 2TC2-5
• "Flaps" breaker - Klixon 2TC2-7.5 
• "Trim" breaker - Klixon 2TC2-5
• collectively SWITCHED (PROGRESSIVE) 

The following can be switched between the main bus and the backup output

• "EFIS" breaker - Klixon 2TC2-5  SWITCHED (PROGRESSIVE)

"Elevator and Aileron Servo" breaker - Klixon 2TC2-7.5  SWITCHED (SPST)

"Interior" breaker - Klixon 2TC2-5  SWITCHED (PROGRESSIVE)

"USB" breaker - Klixon 2TC2-10  SWITCHED (SPST)

"Landing Lights" breaker - Klixon 2TC2-10  SWITCHED (PROGRESSIVE)

"Taxi Lights" breaker - Klixon 2TC2-10  SWITCHED (SPST)

"Nav/Strobe Lights" breaker - Klixon 2TC2-10  SWITCHED (two SPST switches)

"Fuel pump" breaker - Klixon 2TC2-5  SWITCHED (SPST)