Varistor or Transient absorber

W

Wong

Guest
Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!

regards,
Wong
 
Wong wrote:
Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!

regards,
Wong
Click to expand...
I would first look to see if Mouser carries it, as they have good
refernces to manufacturers.
Second place is DigiKey.
Try them.....
 
On 9 Oct 2003 21:51:03 -0700, tatto0_2000@yahoo.com (Wong) wrote:

Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!
Click to expand...
---
I think you're right. With the prefix "ZNR", though, it's probably a
Zener Transient Voltage Suppressor (TVS). I'd guess that "10221" stands
for the clamping current (10A) and voltage (220V, with 22 being the
first two significant figures and 1 being the number of trailing
zeroes.) lot of MOV's and TVS's have a part number indicating the
clamping voltage and current and yours seems to be a 10A 220V device.

Google for Varistor or TVS and you'll get a lot of hits, then take a
look at part numbers with 10 and 221 (or 220) in them to get an idea of
whether what you have matches anything.

--
John Fields
 
Great detective work.

These high voltage protectors are usually MOV technology, especially if it
is a big flat disk format.

Regards,

Bill


"John Fields" <jfields@austininstruments.com> wrote in message
news:6d3dovgcrvseg639s6uotkesshg9mj8iom@4ax.com...
On 9 Oct 2003 21:51:03 -0700, tatto0_2000@yahoo.com (Wong) wrote:

Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!

---
I think you're right. With the prefix "ZNR", though, it's probably a
Zener Transient Voltage Suppressor (TVS). I'd guess that "10221" stands
for the clamping current (10A) and voltage (220V, with 22 being the
first two significant figures and 1 being the number of trailing
zeroes.) lot of MOV's and TVS's have a part number indicating the
clamping voltage and current and yours seems to be a 10A 220V device.

Google for Varistor or TVS and you'll get a lot of hits, then take a
look at part numbers with 10 and 221 (or 220) in them to get an idea of
whether what you have matches anything.

--
John Fields
Click to expand...
 
tatto0_2000@yahoo.com (Wong) wrote in message news:<509bfe22.0310092051.3152e219@posting.google.com>...
Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!
Click to expand...
It's what we call a MOV (Metal-Oxide Varistor), generically
called a ZNR. You can replace it with a similar type
of the same diameter disk (10mm? and rated for the appropriate
voltage. If this is a 120VAC nominal supply, a 220V rated
(221) varistor would be about right, but that's just a guess.
(Varistors are sometimes rated by DC voltage, sometimes AC,
and sometimes both!.

Best regards,
Spehro Pefhany
 
tatto0_2000@yahoo.com (Wong) wrote in message news:<509bfe22.0310092051.3152e219@posting.google.com>...
Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!
Click to expand...
It's what we call a MOV (Metal-Oxide Varistor), generically
called a ZNR. You can replace it with a similar type
of the same diameter disk (10mm? and rated for the appropriate
voltage. If this is a 120VAC nominal supply, a 220V rated
(221) varistor would be about right, but that's just a guess.
(Varistors are sometimes rated by DC voltage, sometimes AC,
and sometimes both!.

Best regards,
Spehro Pefhany
 
tatto0_2000@yahoo.com (Wong) wrote in message news:<509bfe22.0310092051.3152e219@posting.google.com>...
Hi,

I blown a power supply unit and need to replace this component, ZNR
V10221U. Unfortunately I cant find the datasheet online and I think it
should be a varistor or transient absorber. If you know this
component, please help me and let me know.
Thanks in advance for your big help !!
Click to expand...
It's what we call a MOV (Metal-Oxide Varistor), generically
called a ZNR. You can replace it with a similar type
of the same diameter disk (10mm? and rated for the appropriate
voltage. If this is a 120VAC nominal supply, a 220V rated
(221) varistor would be about right, but that's just a guess.
(Varistors are sometimes rated by DC voltage, sometimes AC,
and sometimes both!.

Best regards,
Spehro Pefhany
 
speff@asia.com (Spehro Pefhany) wrote in message

<snipped>

Sorry about the multiple copies, folks. Hazard with
html-based newsgroup access, I'm afraid.

Best regards,
Spehro Pefhany
Click to expand...
 
Hi

If its in a mains filter feeding the unit, it should work fine without
it, tho with a bit less protection and thus a bit less expected MTTF.
Just so you know the options.

Regards, NT
 
bigcat@meeow.co.uk (N. Thornton) wrote in message news:<a7076635.0310130258.6a8063da@posting.google.com>...
Hi

If its in a mains filter feeding the unit, it should work fine without
it, tho with a bit less protection and thus a bit less expected MTTF.
Just so you know the options.
Click to expand...
Yes, and it's unlikely that the OP "blew" it, as he put it, if it's
on the input side. This is typically the result of one too many
transient into the MOV. One way you could affect this would be to put
an inductive load such as a motor or transformer in parallel with the
input of the SMPS and switch the two with a series switch. The typical
failure mode, in any case, is a low resistance leading to very high power
dissipation, burning, and, eventually, a high resistance, though the
fuse may go before that happens.

Best regards,
Spehro Pefhany
 
speff@asia.com (Spehro Pefhany) wrote in message news:<6ae17f35.0310131329.5f1534f0@posting.google.com>...
bigcat@meeow.co.uk (N. Thornton) wrote in message news:<a7076635.0310130258.6a8063da@posting.google.com>...
Hi

If its in a mains filter feeding the unit, it should work fine without
it, tho with a bit less protection and thus a bit less expected MTTF.
Just so you know the options.

Yes, and it's unlikely that the OP "blew" it, as he put it, if it's
on the input side. This is typically the result of one too many
transient into the MOV. One way you could affect this would be to put
an inductive load such as a motor or transformer in parallel with the
input of the SMPS and switch the two with a series switch. The typical
failure mode, in any case, is a low resistance leading to very high power
dissipation, burning, and, eventually, a high resistance, though the
fuse may go before that happens.

Best regards,
Spehro Pefhany
Click to expand...

Right. I'm having second thoughts tho: if its been cooked due to
spikes, maybe it should be replaced before further PSU use after all.
And not switched on with an inductive load in future.

Regards, NT
 
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