VIAIR – 40045 400P-Automatic Function Portable Compressor , Silver

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12 VOLT – 150 PSI Max Working Pressure, engine must be running during use.
2.3CFM Free Flow @ 0 PSI



Product Description

Viair 400P-Automatic Function Portable Compressor offers automatic function. The unit contains an onboard pressure switch that allows the unit to run until an internal pressure of 145 PSI is achieved at which point, the compressor will shut off. To start the compressor, attach to a tire valve stem and squeeze the trigger on the supplied gas station style inflation gun. Once air flows out of the unit, the compressor will restart. It can inflate up to a 35-inch tire from 0 to 30 PSI in less than 5 minutes. Air pressure can be monitored by releasing the trigger on the inflation gun, which will show current tire pressure.


The 400P Automatic is VIAIR’s first Automatic shutoff function portable compressor. Powered by an easy-to-establish temporary connection to a 12-volt battery power source, this 33% duty cycle unit is capable of pressures up to 150 PSI and can be operated for up to 40 minutes at a time before needing to be rested. The 400P Automatic comes with a range of accessories stowable in its soft carry case, including a convenient close-ended gas station-style air gun. .caption { font-family: Verdana, Helvetica neue, Arial, serif; font-size: 10px; font-weight: bold; font-style: italic; } ul.indent { list-style: inside disc; text-indent: -15px; } table.callout { font-family: verdana; font-size: 11px; line-height: 1. 3em; } td.vgoverview { height: 125px; background: #9DC4D8 url(https://images-na.ssl-images-amazon.com/images/G/01/electronics/detail-page/callout-bg.png) repeat-x; border-left: 1px solid #999999; border-right: 1px solid #999999; padding-left: 20px; padding-right: 20px; padding-bottom: 10px; width: 250px; font-family: verdana; font-size: 12px; }

Portable Automatic Compression up to 150 PSI
The VIAIR 400P-Automatic Portable Compressor offers inflation of up to 35-inch tires, and operation at up to 150 PSI for up to 15 continuous minutes at a time, providing that there are 30 minutes provided afterwards for the unit to cool sufficiently. More than just a compressor, the 400P is a complete portable compression system, coming complete with an inflation gun with 200 PSI air pressure gauge, a 25′ extension hose with quick connect coupler and lever chuck, a heavy duty sand tray with vibration isolators, a 8′ power cable, a heavy duty sand tray with vibration isolators, a 3-piece inflation tips kit, an inline fuse holder, a deluxe zippered carry bag and dual heavy duty direct battery clamps. The convenient battery clamps allow you to quickly utilize any 12-volt power source, including your own vehicle’s battery, to address your air compression needs in seconds.

Portable air compression up to 150 PSI suitable for tires up to 35″.
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All your compression needs are in the bag.
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Heavy duty tray included for vibration control.
View larger. The 400P also contains a convenient automatic time and power-saving features. The unit comes with an automatic shutoff function that will power down the 400P when the compressor is turned on, but not actively filling tires – making it unnecessary to turn the unit off between tire fills. In addition, the included closed-ended tire inflation gun allows for on-the-fly tire pressure reading, without having to turn the unit off to check tire pressure.

400P Air Compressor Specifications

  • Motor voltage – 12 volt
  • Motor type – Permanent magnetic
  • Max. duty cycle: 33% @ 100 PSI
  • Max. working pressure – 150 PSI
  • Max. Amp draw – 30 Amps
  • Max. ambient temperature – 158°F
  • Min. ambient temperature – -40°F
  • CFM @ 0 PSI – 2.54
  • Built-in pressure switch – 120 PSI on, 145 PSI off
  • Fuse – 40 Amps
  • Auto. Reset thermal protection – Yes
  • Dimensions – 11.25″L x 4.00″W x 7.00″H
  • Net weight – 8.50 lbs

About Compressor Duty Cycle
Compressor duty cycle refers to amount of time a compressor can be operated in a given time period, at 100 PSI and at a standard ambient temperature of 72°F. Duty Cycle is commonly expressed in percentile as: compressor on time (compressor on time + off time) %. As an example, a compressor that is rated for 25% duty cycle means that compressor can be operated at: 100 PSI @ 72°F for 10 minutes on and 30 minutes off. 10 min. on / (10 min. on + 30 Min. off) = 10 min. / 40 Min = 25% duty cycle.

Fill Rates:
31″ x 10.5″33″ x 12.5″ 35″ x 12.5″ 0 – 30 PSI 2 min. 28 sec. 4 min. 4 min. 50 sec. 15 – 30 PSI 1 min. 25 sec. 2 min 2 min. 20 sec.
What’s in the Box

  • 1-VIAIR 400P portable air compressor
  • 1-Deluxe zippered carry bag with storage compartments
  • 1-Gas station style inflation gun with 200 PSI air pressure gauge
  • 1-25′ extension hose with quick connect coupler and lever chuck
  • 1-Heavy duty sand tray with vibration isolators
  • 1-Set of dual heavy duty direct battery clamps
  • 1-8′ power cable
  • 1-3 piece inflation tips kit
  • 1-Inline fuse holder
  • 1-Owner’s manual

1-Year Limited Warranty
VIAIR Corporation warrants this product, when properly installed and under normal conditions of use, to be free from defects in workmanship and materials for a period of one (1) year from its original date of purchase. This warranty covers product defects only. It does not cover incidental or consequential damages as a result of misuse or abuse.

About VIAIR Corporation
VIAIR offers the most complete line of air compressors and air accessories for both the on-and off-road markets available anywhere. VIAIR products are used in the OEM segment, 4×4 and Sport Air Suspension and have become the industry standard for both 12- and 24-volt automotive applications worldwide. Their compressors are currently being used in every corner of the globe, in the harshest climates imaginable and the company is recognized by its customers and peers alike as the leading manufacturer of high performance air compressors for mobile pneumatic applications.

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From the Manufacturer

40045 Standard Features

  • Permanent Magnetic Motor
  • Duty Cycle: 33% @ 100 PSI
  • Max. Working Pressure: 150 PSI
  • Max. Amp Draw: 26 Amps

See more

Make sure this fits by entering your model number.
12 VOLT – 150 PSI Max Working Pressure, engine must be running during use.
2.3CFM Free Flow @ 0 PSI
Powered direct to the car battery with alligator clamps, comes with a 40 amp in-line fuse.
Great for inflating tires up to 35inches on off-road and agricultural vehicles.
Includes deluxe carry bag for the compressor, air hose, and tire inflation gun.
Vibration-Resistant Diamond-Plate Sand Tray

Specification: VIAIR – 40045 400P-Automatic Function Portable Compressor , Silver

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