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30 Amp switch?

 
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bicyclop(at)pacbell.net
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PostPosted: Mon Jul 21, 2008 8:26 pm    Post subject: 30 Amp switch? Reply with quote

I have a setup where I need to switch about 30 amps as a backup power
source. Is there such an animal as a toggle switch that will handle
that, or do I need to think about a relay?

Pax,

Ed Holyoke


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dsvs(at)ca.rr.com
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PostPosted: Mon Jul 21, 2008 8:37 pm    Post subject: 30 Amp switch? Reply with quote

Ed,
The marine guys use a battery switch that would handle the thirty amps.
Problem is it is big and fairly expensive. A relay would probably be
better. Don VS

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rshannon



Joined: 05 Sep 2007
Posts: 62

PostPosted: Tue Jul 22, 2008 7:57 am    Post subject: 30 Amp switch? Reply with quote

FYI, there are several good, small relays available for this purpose. For a FWF location, my choice would be the P&B T92D11D-12, rated 30A with quick tab connections, available from Digikey or Mouser. Prolink makes a couple rated at 40A, available from Circuit Specialists, see http://tinyurl.com/5pj6tm. The former are all lightweight, with low coil current requirements. There are also several automotive relays (Bosch, etc.) with these ratings. If it will be in a weather protected location, i.e., aft of the FW, you might also want to consider the solid state Powerlink III Jr., rated 35A continuous, from Perihelion, with a very low control current, though it's a little bit heavier than the P&B.

Ron

On Mon, Jul 21, 2008 at 9:34 PM, Don Vs <dsvs(at)ca.rr.com (dsvs(at)ca.rr.com)> wrote:
[quote] --> AeroElectric-List message posted by: "Don Vs" <dsvs(at)ca.rr.com (dsvs(at)ca.rr.com)>

Ed,
The marine guys use a battery switch that would handle the thirty amps.
Problem is it is big and fairly expensive. A relay would probably be
better. Don VS


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nuckolls.bob(at)cox.net
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PostPosted: Thu Jul 24, 2008 6:14 am    Post subject: 30 Amp switch? Reply with quote

At 08:52 AM 7/22/2008 -0700, you wrote:
Quote:
FYI, there are several good, small relays available for this purpose. For
a FWF location, my choice would be the P&B T92D11D-12, rated 30A with
quick tab connections, available from Digikey or Mouser. Prolink makes a
couple rated at 40A, available from Circuit Specialists, see
<http://tinyurl.com/5pj6tm>http://tinyurl.com/5pj6tm. The former are all
lightweight, with low coil current requirements. There are also several
automotive relays (Bosch, etc.) with these ratings. If it will be in a
weather protected location, i.e., aft of the FW, you might also want to
consider the solid state Powerlink III Jr., rated 35A continuous, from
Perihelion, with a very low control current, though it's a little bit
heavier than the P&B.

Good recommendation. I concur. This is the same
style of relay offered by B&C as their S704-1
and looks like this:

http://aeroelectric.com/Pictures/Relays/s704-1l.jpg

if you need to put your hands on a suitable product
right away and there's a Radio Shack handy, you
might consider this device:

http://tinyurl.com/69mypb

Bob . . .


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