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Air compressor contactor/wiring problem. Need help please!


Jul 20, 2014
It says 7.5 HP for a reason, rated in HP for an inductive load, starting across the line.
The 45A rating is for a resistive type load, if you run it at higher HP than rated the contacts will burn up and then so will your new motor when it no longer receives the proper current and voltage under load.

Another possible option would be to replace the motor sheave with a smaller diameter to reduce the connected load to the 7.5 HP level, but you would need to check with Ingersoll on the minimum pump speed is for proper oil distribution is. Less speed takes longer to pump up, but will reduce the strain on the motor, starter and electrical supply.