Can anyone tell me if a 370 volt Capacitor can replace a 440 volt?

Question

If the Microfads are the same? This is a 40-5 Dual run Capacitor for a A/C Unit

I guess I am not sure if this voltage is the Maximum this capacitor will take in a spike?
Or is it the OUTPUT of the Capacitor itself?
Beacause as I understand it, they are rated in Microfads.

Let me rephrase..........The voltage on a capacitor in this case is: The voltage the unit will take in a spike? OR the voltage is what the unit puts out after current goes thru it? FYI this is a 230 volt a/c unit.

LET ME ADD THAT THIS IS A "RUN" CAPACITOR NOT A START CAPACITOR I PUT IT ON AND IT IS WORKING JUST FINE FOR NOW

Answer 1

The lower voltage unit will breakdown at a lower voltage which means it is more likely to fail. So, it would maybe work (depending on the specs and the voltage the cap sees) but if the voltage spikes it would die sooner. Alternatively, the working voltage for the system may be greater than 370 and it could blow immediately. How much margin of error do you want?

Answer 2

No. Not tif the 440 was sized correctly to begin with. A 440 or higher would be required.

Now it might be that a 440 was never required and so you would be OK. But to find out, check with the manufacturer and see if a 370 was originally specified for the unit. Many central air units use 370 v run caps. It is very common and I assume why you are asking.

ADDED---
Like I said- it is probably OK witha 370 as that is cmmon on residnetial air units- BUT- and I stress BUT- I do not know what unit you are running- whether it is 208 or 420v or what. And also a larger voltage rating gives you better protection against transient surge and spike.

SO---- again I tell you- the 370 is proabbaly OK- but I would look up the original part on a web appliance site and see. Worst case scenario, it burns up and catches your house on fire. But my friend- a 440 can do that too..... Good luck

Answer 3

I have replaced 440's with 370's several times without any call-backs. I think most of the voltage to residential units is 208-230, so it should be fine.

Answer 4

hello,,, the 370 volt capacitor cannot replace the 440 but the 440 can replace the 370,, i know it sound strange, but the 370 will not be enough to start the motor ,,,,, you should replace it with what goes in it however,,,, but just a tip

Answer 5

Nope don't do it, you can use a capacitor with a higher MFD rating but always use the same voltage rating. Could blow your cappy up.

Answer 6

Nope! It will catch fire or short out and then catch fire. If the voltage rating is higher then yes, it would be fine. Do not do this.