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General Mach Discussion / Re: Switching on/off large DC Motor
« on: November 04, 2009, 05:45:02 PM »
I hate to mention this but we use regular automotive starter solenoids for 48 and 72 volt pump motors that start at 140 amps and run at 40 amps. 12 volt coil is the only drawback and you may want to use one with a timer for your brake as the brake currents can be brutal. Our pumps run for hours at a time and the solenoids heat up but don't fail.