# What is the value & voltage ratings of this capacitor

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#### Vindhyachal Takniki

Joined Nov 3, 2014
594
What is the value & voltage ratings of this capacitor

1. Attached find a pic of a board. This is capacitive supply board & two capacitor in series are used. The boards works upto 440V.

2. What is capacitance & voltage rating of this capacitor.
Is cap = 550uF
& voltage rating=??

3. H684K C
550MFF4

Not sure if its C in first line end.

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#### hp1729

Joined Nov 23, 2015
2,304
What is the value & voltage ratings of this capacitor

1. Attached find a pic of a board. This is capacitive supply board & two capacitor in series are used. The boards works upto 440V.

2. What is capacitance & voltage rating of this capacitor.
Is cap = 550uF
& voltage rating=??

3. H684K C
550MFF4

Not sure if its C in first line end.
I would say 0.68 uF (684 = 680,000 pF), 550 V

#### atferrari

Joined Jan 6, 2004
4,782

#### AlbertHall

Joined Jun 4, 2014
12,384
I would say 0.68 uF (684 = 680,000 pF), 550 V
Yes, I agree with this analysis.

#### hp1729

Joined Nov 23, 2015
2,304
That's interesting. 550 nF would not be a standard value. 0.68 uF would be. That would be an unusually large capacitor for 550 nF.

#### bertus

Joined Apr 5, 2008
22,289
Hello,

That's interesting. 550 nF would not be a standard value. 0.68 uF would be. That would be an unusually large capacitor for 550 nF.
550 Volts is also not a standard value, I would expect to find a 630 Volts type.

Bertus

#### hp1729

Joined Nov 23, 2015
2,304
Hello,

550 Volts is also not a standard value, I would expect to find a 630 Volts type.

Bertus
Yep, I guess that is true too.

#### atferrari

Joined Jan 6, 2004
4,782
What if one terminal of one of them is de soldered and the capacity measured?

#### ian field

Joined Oct 27, 2012
6,536
What is the value & voltage ratings of this capacitor

1. Attached find a pic of a board. This is capacitive supply board & two capacitor in series are used. The boards works upto 440V.

2. What is capacitance & voltage rating of this capacitor.
Is cap = 550uF
& voltage rating=??

3. H684K C
550MFF4

Not sure if its C in first line end.
The 684K corresponds to the preferred value; 680000pF (or 680nF) and the K is a predictable tolerance code.

It doesn't look big enough for 550V, and that would be a peculiar voltage rating unless its some sort of code.

#### AlbertHall

Joined Jun 4, 2014
12,384

#### ian field

Joined Oct 27, 2012
6,536
0.68uF is quite a big capacitance for that type - my *GUESS* would be somewhere in the general direction of 200V unless proven otherwise.

I've seen that type as big as 10uF, but they were pretty big and the voltage rating wasn't very impressive.

#### Vindhyachal Takniki

Joined Nov 3, 2014
594
I have to make a capacitive supply from 440Vac to 9vdc & then regulator 7805.
Will make & see the results. Tested using these capacitors it is working fine.
But I will connect two 2.2uF,400V in series to be used for this since current requirement is bit more, cap as in attaced pic. SO that end capacitance is 1.1uF/800V.
Though They are not safe since they are not X2 type. But I have seen them in so many boards, none of them had any problem due to capacitor or capacitor every busted.

1. Are these two capacitor in series can withstand 440Vac. Since combined voltage value will be 800V. In ac 440Vac peak will be = 440*(2^0.5) = 622Vac. So I think I am well within limits?
Theoretically for 800V max ac can be = 800V/(2^0.5) = 565Vac.

2. What is voltage variation in these capacitors? is it +-10%?
3. Which fuse value should be used in this? Max ac load comes out to 150mA. So I am placing 1A fuse.
4. What is the MOV selection criteria for this.

Last edited:

#### ScottWang

Joined Aug 23, 2012
7,411
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