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Part# 11-08430
MFR Model# EX-110 W/BB


The EXPBUS 2V mounting tray is the ultimate in quick build time savings. The tray comes Pre-punched, and pre-assembled with rocker switches prewired to the PC board. All the builder needs to do is to cut a single rectangular hole in the panel, connect the battery, alternator, and all of the load wires to the proper terminals on the EXP BUS2 PC board mounted in the chassis.

For 14V DC systems (not recommended for 28V aircraft)

EXPBUS II--Second generation design
Simplifies and organizes wiring
Saves time, panel space, weight, and money
Solid state "fuses" eliminate breakers
Avionics master switch/starter cutout
"Soft Start" extends landing light life
Overvoltage protection
Clearance delivery input for NavCom
Dual bus option for backup battery
A Complete Electrical System

The EXPBUS 2 DC Load Center replaces all but one circuit breaker in most homebuilt aircraft, and includes the master switch, master relay, and the avionics master switch. The avionics output bus provides six protected circuits, and automatically shuts off when the starter is engaged. Three master bus outputs operate items such as panel lights, gyros and engine instruments. Switched outputs include the alternator field, Beacon/Strobe output, nav light output, aux fuel pump output, two landing light outputs, and two spares. All outputs are overload protected, eliminating the need for fuses or circuit breakers, and saving the labor of installing and wiring them up.

Better Than Fuses
EXPBUS II products are solid state protection devices that function very much like circuit breakers. When overloaded, these devices "blow," and the offending circuit safely shuts down. Unlike a fuse, the devices reset themselves, unharmed, after the load is removed for several seconds. Unlike breakers, there are no contacts to weld "on." Once tripped, these devices will remain "off" until the original load is completely removed for several seconds. These proven devices are annually used in hundreds of thousands of automobiles.

Free Time For Sale
Mounting requires drilling a few holes in the panel and bolting the unit in. Connect the battery cable directly to the terminal, and power leads from any devices such as radios, lights, gyros, and pumps to the proper switch or terminal on the PC board. Install one 40 amp breaker between the alternator and the PC board. All other outputs from the PC board are overload protected. There are no other fuses or circuit breakers to buy or install. Just think of the drilling, mounting, cutting, crimping, routing, labeling, and troubleshooting you will save (not to mention skinned knuckles and bleeding fingers). AND, while you save time, you will be getting a clean high-tech installation, with virtually no unfused wiring behind the panel. The switches can even be easily removed from the PC board, allowing the board to be remote mounted, anywhere in the aircraft.

Advanced Features
The Clearance delivery circuit allows one avionics bus output to be powered up with the master switch off--very handy at busy airports. The overvoltage protection circuit locks out the alternator field if the bus voltage ever exceeds 18 volts. The landing light outputs feature "soft start" circuits to greatly extend landing light bulb life. With the backup battery option, the two AUX outputs and one nav-com can automatically be powered by a standby power source in the event of a failure of the primary electrical system. The standby battery is automatically charged from the master bus during normal operation, eliminating the need for dual alternators in most cases.

Size: 9.75" long by 4.625" deep by 1.875" tall. Weight 0.8 lbs.

Switched Ouputs

  • Master Switch/Avionics Master
  • Alternator Field - 5 amps
  • Beacon/Strobe - 7 amps
  • Nav Lights - 7 amps
  • Aux. Pump - 7 amps
  • LDG/Taxi - 9 amps
  • LDG/Taxi - 9 amps
  • Aux.Output (2) - 11 amps


  • Maximum Current Capacity - 40 Amps
  • Bus Voltage - 14 Amps
  • Keep-Alive Output (1, not switched) - 3 Amps
  • Master Outputs (2, always on with master) - 1 Five Amp, 1 Seven Amp
  • Instrument Light Output - 3 Amps
  • 12 Month Manufacturer Warranty - Control Vision Corporation warrants this product to be free from defects in materials and workmanship for one year from the date of purchase, or one year from the date of issuance of the airworthiness certificate in the experimental aircraft in which this product is originally installed, whichever is longer. This warranty is limited to replacement of the product or refund of the purchase price of this product only.

Avionics Master Outputs

  • 1 Seven Amp Output
  • 2 Five Amp Outputs
  • 3 Three Amp Outputs
  • The above current ratings are based on "recommended" operating current. Traditional fuses and circuit breakers are rated in terms of "maximum" operating current. A 9 amp polyfuse circuit is roughly comparable to a 14 amp fuse or breaker. The above fuse sizes are a good match for most sport aircraft, your project will probably work well with this configuration.


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I have purchased and installed 4 of the EXPBUS units and I have found them to be very simple to install and very reliable. On one occasion I had difficulty with one unit and I sent it in to the factory for the repair. They simply exchanged it and were very friendly and customer oriented. Noah Holloway MBA, CFII

Noah H
November 5, 2014

This bus does not have any support. I had an issue with my bus and I tried calling the company with the number in the manual and that went to a different company and then I emailed the address that I found in the manual as well. Aircraft Spruce gave me another number to try and that didnt work. Finally they gave me an email that somehow worked to get in contact with the company to ask for an RMA. From my experience this bus does not have support. I plan on buying the composite design bus where I can get support. Aircraft Spruce was very little help in trying to get this issue resolved. It wasnt until I left my first review of a 1 star that someone reached out and apologized. Lets see if this review stays up.

June 24, 2020


Q: What are the labels on the switches for the EXPBUS 2V?

From left to right: Master, Alt Field, Avionics Master, Fuel Pump, Strobe Lights, Nav Lights, Landing Light, Taxi Light, IGN, Aux and Clrnc Del.

Q: Can the labels under the switches be change around?

No, the labels come standard. The only other option is to have us special order a blank version so you can do your own labels.

Q: How does the battery backup work, does it charge the second and not allow it to be discharged in normal conditions? Regards Andy

While the primary battery is on, it will charge the secondary back up battery and maintain it while on.

Q: What does IGN stand for on the second to last switch?

IGN is short for Ignition.

Q: For the Tray Mount EXPBUS 2V, what if I have a 60 Amp alternator?

The maximum current capacity of the Tray Mount EXPBUS 2V is 40 Amps.

Q: Does this system need diode protection at the solenoids?

According to the installation directions, the starter should be connected to an external starter solenoid, which is connected directly to either the battery, the master solenoid, or the battery terminal on the EXPBUS circuit board.

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