VIAIR 400P Automatic — overview
The VIAIR 400P Automatic is a 12V portable compressor intended for automatic tyre inflation. Its manufacturer-rated free airflow is 2.30 CFM at 0 PSI, with a maximum working pressure of 150 PSI. VIAIR lists it for tyres up to 35 inches; actual inflation times depend on tyre size, starting pressure, environmental conditions and the air hose arrangement.
The stated duty cycle is 33% at 100 PSI. This is a usage limit measured at the specified pressure, not a claim that the unit can operate continuously at every pressure. Allow cooling time and follow VIAIR’s user manual. The compressor is suited to users who prefer automatic compressor control during tyre inflation, subject to the supplied kit configuration. The automatic version provides convenient stop-start use while checking tyre pressure; use the supplied gauge and operating instructions.
Technical specifications
| Manufacturer |
VIAIR |
| Manufacturer part number |
40045 |
| Supply voltage |
12V |
| Maximum working pressure |
150 PSI |
| Free airflow at 0 PSI |
2.30 CFM |
| Duty cycle |
33% at 100 PSI |
| Maximum current |
30 A |
| Ingress protection |
IP54 |
| Manufacturer maximum tyre size |
35 inches |
| Power connection |
Battery clamps |
Technical values: VIAIR manufacturer comparison chart. Check kit contents and individual manuals for the supplied version.
400P-Automatic is VIAIR’s first Automatic shut-off function portable compressor. 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 (at up to 40 PSI). The 400P-Automatic comes with a close-ended gas station-style air gun for added convenience.
Portable 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. A typical portable compressor 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 portable compressor to turn the unit on and off. Automatic portables do not work in this fashion and will save you time & effort to get tires inflated quickly.
| FEATURES |
| – Gas Station-Style Tire Inflation Gun with 160 PSI Gauge |
| – Thermal Overload Protector |
| – Automatic Shut-Off Function |
| – Quick Connect Air Hose with Heat Shield |
| – Vibration-Resistant Diamond-Plate Sand Tray |
| – Deluxe Dual Compartment Carry Bag |
| – 40-amp Inline Fuse Holder |
| – Dual Battery Clamps |
| – 3 pc. Inflation Tips Kit |
| – |
| SPECIFICATIONS |
| – 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: 10.87″L x 5.83″W x 7.48″H |
| – Net Weight: 10.70 lbs. |
| – Power Cord Length: 8 ft. |
| – Air Hose Length: 30 ft. |
Please Note: The air hose supplied with this kit may become brittle from prolonged exposure to UV/sunlight.-Stow when not in use. Never allow the hose to come into contact with the head of the compressor during use (melting hazard). The use of the included air hose is not recommended in sub zero or freezing conditions. The 400P does not work with Presta bicycle valves, unless used with a Presta Valve Adapter.
PERFORMANCE DATA
| PSI |
CFM |
A |
BAR |
LPM |
A |
| 0 |
2.30 |
17 |
0 |
65.1 |
17 |
| 10 |
2.13 |
19 |
1.0 |
58.4 |
20 |
| 20 |
1.98 |
21 |
2.0 |
53.0 |
23 |
| 30 |
1.86 |
23 |
3.0 |
48.5 |
24 |
| 40 |
1.75 |
24 |
4.0 |
44.2 |
26 |
| 50 |
1.64 |
25 |
5.0 |
40.2 |
27 |
| 60 |
1.54 |
26 |
6.0 |
37.0 |
28 |
| 70 |
1.44 |
27 |
7.0 |
33.3 |
29 |
| 80 |
1.37 |
27 |
8.0 |
30.1 |
28 |
| 90 |
1.28 |
28 |
9.0 |
27.0 |
28 |
| 100 |
1.19 |
29 |
10.0 |
22.1 |
27 |
| 110 |
1.11 |
29 |
|
|
|
| 120 |
1.04 |
28 |
|
|
|
| 130 |
0.95 |
28 |
|
|
|
| 140 |
0.85 |
27 |
|
|
|
| 150 |
0.71 |
27 |
|
|
|
FILL RATES
| 31″ X 10.5″ |
FILL RATE |
| 0 to 30 PSI |
3 min. 00 sec. (± 10 sec.) |
| 15 to 30 PSI |
1 min. 35 sec. (± 05 sec.) |
| 33″ X 12.5″ |
FILL RATE |
| 0 to 30 PSI |
4 min. 20 sec. (± 10 sec.) |
| 15 to 30 PSI |
2 min. 05 sec. (± 05 sec.) |
| 35″ X 12.5″ |
FILL RATE |
| 0 to 30 PSI |
5 min. 20 sec. (± 15 sec.) |
| 15 to 30 PSI |
2 min. 45 sec. (± 05 sec.) |
* Supply Voltage: 13.8 Volts
OE Reference: 40045
SKU: 520020013
