## What does VAC mean on a capacitor?

Volts Alternating Current
The other value that you confront when choosing between single run capacitors is the VAC value. VAC stands for “Volts Alternating Current,” and it indicates the supply voltage for which the unit is rated. Depending on your system, you need a run capacitor with either 370 VAC or 440 VAC.

## Does VAC matter on a capacitor?

The voltage rating is the working voltage for the capacitor to reach 60,000 applied hours. If the heating or air conditioning unit increases voltage to the capacitor (for example: the capacitor is rated for 370 Vac, and is seeing 440 Vac from the unit), then the life of the capacitor will be lowered significantly.

Can I use a capacitor with a higher vac?

Can You Use a Larger Run Capacitor? The same apply with capacitor that is rated 370 Volts. A 440 capacitor can easily replace his little cousin 370, but not vice versa. When a 370 is used instead of the correct one it will fail prematurely, because the dielectric that is used to build it can’t handle voltage that high.

### What does MFD mean on a capacitor?

1) Run capacitors are rated in a range of 3-70 microfarad (mfd). Run capacitors are also rated by voltage classification. The voltage classifications are 370V and 440V. Capacitors with ratings above 70 microfarad (mfd) are starting capacitors.

### Can I use a 50v capacitor instead of a 25v?

Yes. Just don’t go below 25v. The 4.7uF is an “exact” value, whereas the 25v is a maximum rating. Probably yes: Ideally you should replace the capacitor with one of the same nominal capacitance and an equal or greater maximum voltage rating.

Can a 440v capacitor replace a 370v?

The Voltage Rating is What it Can Handle, Not What it Will Produce. Many techs think they must replace a 370v capacitor with a 370v capacitor. The voltage rating displays the “not to exceed” rating, which means you can replace a 370v with a 440v but you cannot replace a 440v with a 370v.

#### Can I replace a motor capacitor with a higher UF?

An electric motor start capacitors can be replaced with a micro-farad or UF equal to or up to 20% higher UF than the original capacitor serving the motor.

#### Can I replace a 16v capacitor with a 25V capacitor?

The maximum voltage you can deal with is what the voltage rating is. If you use a 25v rated cap, never exceed 25V. Don’t exceed 16v for a 16v rated cap.

Is it OK to use a lower MFD capacitor?

Under sized (smaller than needed microfarad) will result in longer starting times, and if excessively undersized no starting. Larger than needed microfarad values will not cause much of any problems (especially for a start capacitor). A larger than needed run capacitor will not have any real affect.