Question 1

Would this work on  a Mercedes benz s430 airmatic compressor

Accepted Answer

is it 40 amps or less then it should

Question 2

Will this relay work for a Mercedes R350

Accepted Answer

relays see amperage only, so if what you are trying to control does not draw more than the rated amperage of the relay, then yes

Question 3

I just bought this relay to go with the viair high flow 150 set up. But it only has a pos and neg wire will the relay work?

Accepted Answer

Yes it should work.  The purpose of a relay is to allow the use of smaller gauge wire for the pressure switch input from the pressure tank and on/off switch, however, you need to use an appropriately sized wire from your battery or another high amperage source direct to the compressor.  The item shown is for 40 amp delivery and if this is the draw for your compressor, you should be looking at wire in the 8 gauge range for both positive and to chassis ground or all the way back to the battery.  If the compressor draw is less, like something in the 15 or 20 amp range, you can still use this relay and use 14 gauge (for 15 amp draw) or 12 gauge (for 20 amp draw) for the main positive and negative run to the compressor.  As stated above, the ancillary wiring for pressure switch, on/off switch can be much smaller wire gauge.  An internet search should have wiring diagram info for high amp devices and possibly the Viair website.  Be aware that I am NOT an electrician so do not blindly follow my input. Hope this helps somewhat.

Question 4

Will it fit a R350

Accepted Answer

that I can't tell.

Manufacturer	Birsppy
Part number	93940
Item Weight	22.7 g
Product Dimensions	15.24 x 15.24 x 13.97 cm; 22.68 g
Item model number	93940
Voltage	12 Volts
Wattage	480 watts
Item Package Quantity	1
Plug profile	DIN Rail Mount
Batteries included?	No
Batteries Required?	No

Viair 93940 40 Amp Air Compressor Relay for 12 Volt compressor

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