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Viair 400H-A Hard-Mount Automatic Compressor

400H-A Hard-Mount Automatic Compressor

The 400H-Automatic Compressor (400H-A) is VIAIR’s newest addition to our H model family. This compressor is CE certified and IP54 Rated. With 33% duty cycle, this hard mount compressor is intended to fill tires up to 35” and can be operated for up to 40 minutes at a time before needing to be rested (at up to 40 PSI). The 400H-A comes with a built-in, moisture resistant On/Off power switch and automatic shut-off function. The 400H-Automatic comes with a 30ft inside braided coil hose, Gas Station-Style Tire Inflation Gun with 160 PSI Gauge and a carry bag for added convenience.

Automatic Shutoff

Compressors with automatic shutoff come into play when moving from tire to tire, and when checking tire pressure in the middle of a tire fill. H standard compressors must be turned off between tire fills, and anytime you want to check tire pressure. If you aren’t near the compressor, this can turn into running laps back and forth to the compressor to turn the unit on and off. Automatic compressors do not work in this fashion and will save you time & effort to get tires inflated quickly.


– Gas Station-Style Tire Inflation Gun with 160 PSI Gauge
– Thermal Overload Protector
– Automatic Shut-Off Function
– Upgraded Vibration Isolators
– 30 ft. Braided inside Black Coil Hose
– 40-amp Inline Fuse Holder
– Storage Bag for Hose and Tire Inflation Gun
– Air Line for Remote Mount Air Filter
– Upgraded Vibration Isolators
– Mounting Hardware
– (2) Replacement Air Filter Elements
– Installation Instructions


– 12-Volt
– Permanent Magnetic Motor
– Duty Cycle: 33% @ 100 PSI
– Max. Working Pressure: 150 PSI
– Max. Amp Draw: 30 Amps
– Ingress Protection Rating: IP54
– Dimensions: 10.83″L x 4.13″W x 7.28″H
– Net Weight: 10.70 lbs.
– Power Cord Length: 8 ft.
– Air Hose Length: 30 ft.

Performance Data


Fill Rates

31″ x 10.5″Fill Rate
0 to 30 PSI3 min. 00 sec. (± 10 sec.)
15 to 30 PSI1 min. 35 sec. (± 05 sec.)
33″ x 12.5″Fill Rate
0 to 30 PSI4 min. 20 sec. (± 10 sec.)
15 to 30 PSI2 min. 05 sec. (± 05 sec.)
35″ x 12.5″Fill Rate
0 to 30 PSI5 min. 20 sec. (± 15 sec.)
15 to 30 PSI2 min. 45 sec. (± 05 sec.)

Supply Voltage: 13.8 Volts

Downloads/ Notes

Please Note: Use thread sealant for proper installation. Thread tape is not recommended.
Properly sealed, recommended torque for 1/8” is 10 ~ 11 ft. lbs. Recommended torque for 1/4” and 3/8” is 16 ~ 18 ft. lbs.


Additional Info Download:

Manual ‣
Dimensional Drawing ‣
Wiring Diagram ‣

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