Daku
Guest
Sat Jan 21, 2012 8:17 am
Could some electronics guru please help ? This
is the first time in my career I am having to select
a relay for a non-work related project, and I am
not sure how to pick the current/voltage ratings
for it. Any hints/suggestions would be immensely
helpful.
John Fields
Guest
Sat Jan 21, 2012 8:17 am
On Fri, 20 Jan 2012 22:17:14 -0800 (PST), Daku <dakupoto_at_gmail.com>
wrote:
Quote:
Could some electronics guru please help ? This
is the first time in my career I am having to select
a relay for a non-work related project, and I am
not sure how to pick the current/voltage ratings
for it. Any hints/suggestions would be immensely
helpful.
---
Application?
--
JF
NT
Guest
Sat Jan 21, 2012 9:29 pm
On Jan 21, 6:17 am, Daku <dakup...@gmail.com> wrote:
Quote:
Could some electronics guru please help ? This
is the first time in my career I am having to select
a relay for a non-work related project, and I am
not sure how to pick the current/voltage ratings
for it. Any hints/suggestions would be immensely
helpful.
What do you need to know about it?
Might hep if you told us exactly what youre doing with it.
NT
Tim Wescott
Guest
Sat Jan 21, 2012 11:06 pm
On Fri, 20 Jan 2012 22:17:14 -0800, Daku wrote:
Quote:
Could some electronics guru please help ? This is the first time in my
career I am having to select a relay for a non-work related project, and
I am not sure how to pick the current/voltage ratings for it. Any
hints/suggestions would be immensely helpful.
Well, you certainly aren't telling us much!!
Do you know how much current the relay has to carry? Do you know how
much current it has to switch (usually these are the same -- sometimes
they aren't). Do you know the voltage the relay has to withstand? Are
all these quantities alternating current or direct?
Do you know what voltage you have available to power the coil? For that
matter, are you thinking solid state relay when you think relay?
Answer all of the above, and see if it helps.
--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
NT
Guest
Sun Jan 22, 2012 2:54 am
On Jan 21, 10:06 pm, Tim Wescott <t...@seemywebsite.please> wrote:
Quote:
On Fri, 20 Jan 2012 22:17:14 -0800, Daku wrote:
Could some electronics guru please help ? This is the first time in my
career I am having to select a relay for a non-work related project, and
I am not sure how to pick the current/voltage ratings for it. Any
hints/suggestions would be immensely helpful.
Well, you certainly aren't telling us much!!
Do you know how much current the relay has to carry? Do you know how
much current it has to switch (usually these are the same -- sometimes
they aren't). Do you know the voltage the relay has to withstand? Are
all these quantities alternating current or direct?
Do you know what voltage you have available to power the coil? For that
matter, are you thinking solid state relay when you think relay?
Answer all of the above, and see if it helps.
And whether the load's inductive or capacitive, af or rf, and whether
you're running the coil off battery and need to minimise power.
NT
Tim Wescott
Guest
Sun Jan 22, 2012 5:05 am
On Sat, 21 Jan 2012 19:54:13 -0800, Daku wrote:
Quote:
On Jan 21, 5:06Â pm, Tim Wescott <t...@seemywebsite.please> wrote:
On Fri, 20 Jan 2012 22:17:14 -0800, Daku wrote:
Could some electronics guru please help ? This is the first time in
my career I am having to select a relay for a non-work related
project, and I am not sure how to pick the current/voltage ratings
for it. Any hints/suggestions would be immensely helpful.
Well, you certainly aren't telling us much!!
Do you know how much current the relay has to carry? Â Do you know how
much current it has to switch (usually these are the same -- sometimes
they aren't). Â Do you know the voltage the relay has to withstand? Â Are
all these quantities alternating current or direct?
Do you know what voltage you have available to power the coil? Â For
that matter, are you thinking solid state relay when you think relay?
Answer all of the above, and see if it helps.
--
Tim Wescott
Control system and signal processing consultingwww.wescottdesign.com
The relay is for a power electronics board that I am working on, and
obtained from :
http://www.timnolan.com/index.php?page=solar-grid-intertie-inverter As I
did not design the board, I am not sure about the maximum current
through the coil, or the available voltage across it. The design as I
have inherited it, uses a regular wire coil relay, but if possible, I
would definitely use a solid state relay.
That article has schematics -- why don't you type the part number of the
relay from the schematic into DigiKey, and see what pops up? Failing
that, try Google.
--
Tim Wescott
Control system and signal processing consulting
www.wescottdesign.com
Daku
Guest
Sun Jan 22, 2012 5:54 am
On Jan 21, 5:06 pm, Tim Wescott <t...@seemywebsite.please> wrote:
Quote:
On Fri, 20 Jan 2012 22:17:14 -0800, Daku wrote:
Could some electronics guru please help ? This is the first time in my
career I am having to select a relay for a non-work related project, and
I am not sure how to pick the current/voltage ratings for it. Any
hints/suggestions would be immensely helpful.
Well, you certainly aren't telling us much!!
Do you know how much current the relay has to carry? Do you know how
much current it has to switch (usually these are the same -- sometimes
they aren't). Do you know the voltage the relay has to withstand? Are
all these quantities alternating current or direct?
Do you know what voltage you have available to power the coil? For that
matter, are you thinking solid state relay when you think relay?
Answer all of the above, and see if it helps.
--
Tim Wescott
Control system and signal processing consultingwww.wescottdesign.com
The relay is for a power electronics board that I am working on,
and obtained from :
http://www.timnolan.com/index.php?page=solar-grid-intertie-inverter
As I did not design the board, I am not sure about the maximum
current through the coil, or the available voltage across it. The
design as I have inherited it, uses a regular wire coil relay, but if
possible, I would definitely use a solid state relay.
Reinhard Zwirner
Guest
Sun Jan 22, 2012 6:43 pm
Tim Wescott schrieb:
Quote:
On Sat, 21 Jan 2012 19:54:13 -0800, Daku wrote:
[...]
Quote:
The relay is for a power electronics board that I am working on, and
obtained from :
http://www.timnolan.com/index.php?page=solar-grid-intertie-inverter As I
did not design the board, I am not sure about the maximum current
through the coil, or the available voltage across it. The design as I
have inherited it, uses a regular wire coil relay, but if possible, I
would definitely use a solid state relay.
That article has schematics -- why don't you type the part number of the
relay from the schematic into DigiKey, and see what pops up? Failing
that, try Google.
<http://octopart.com/v23079a1001b301-tyco%2Belectronics-697892>
HTH
Reinhard
NT
Guest
Sun Jan 22, 2012 9:10 pm
On Jan 22, 3:54 am, Daku <dakup...@gmail.com> wrote:
Quote:
On Jan 21, 5:06 pm, Tim Wescott <t...@seemywebsite.please> wrote:
On Fri, 20 Jan 2012 22:17:14 -0800, Daku wrote:
Could some electronics guru please help ? This is the first time in my
career I am having to select a relay for a non-work related project, and
I am not sure how to pick the current/voltage ratings for it. Any
hints/suggestions would be immensely helpful.
Well, you certainly aren't telling us much!!
Do you know how much current the relay has to carry? Do you know how
much current it has to switch (usually these are the same -- sometimes
they aren't). Do you know the voltage the relay has to withstand? Are
all these quantities alternating current or direct?
Do you know what voltage you have available to power the coil? For that
matter, are you thinking solid state relay when you think relay?
Answer all of the above, and see if it helps.
--
Tim Wescott
Control system and signal processing consultingwww.wescottdesign.com
The relay is for a power electronics board that I am working on,
and obtained from :http://www.timnolan.com/index.php?page=solar-grid-intertie-inverter
As I did not design the board, I am not sure about the maximum
current through the coil, or the available voltage across it. The
design as I have inherited it, uses a regular wire coil relay, but if
possible, I would definitely use a solid state relay.
You need to know the V being applied to the coil, and the V and i_max
for teh contacts. On the latter you can simply go overkill, but teh
former you need to know.
NT
