That's 277 volts of alternating current.
This is typically one phase of a 480v 3 phase system. Don't worry that 3 x 277 adds up to more than 480v.
A 277v line is typically one phase of a 480v 3 phase system.
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It depends on what 277 volt device you are trying to connect.
v = volts a = alternating c = current vac is what the lights and appliances in your house use. Your TV uses 120VAC. 120vac is the accepted standard of electric current commonly used through out the U>S>. Vac speaks of ac or alternating current voltage.
Yes, generally, all other things being the same. By all other things I mean the capacitance, the type of capacitor for the application, etc.
vac stands for AC voltage
The difference is that the 440 vac capacitor has a 70 volt-amp-current higher output than the 370. Capacitors must always be replaced with the same size micro-farads or you'll damage the device, such as a motor. The vac rating can be changed with a capacitor with a higher rating but not lower. Example: 15mfd at 370vac can be replaced by a 15mfd at 440vac, but not the opposite.