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jonlaury
Joined: 06 Nov 2006
Posts: 336
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 Posted: Tue Jun 01, 2010 9:08 am Post subject: Trying to eliminate mini-contactors |
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In my system, I have a 10-15 amp circuit to the EFI injectors. In practice, this circuit will see about 6a , worst case. Bob N calls for a mini-contactor for fused circuits over 7a fused.
My Honeywell switches are rated for 15a resistive, which is effectively a 100% margin.
Unless I'm missing something, it appears to me that I could dispense with the mini-contactor and just wire the load directly through the switch.
What say ye?
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dennis.glaeser(at)hp.com
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| Posted: Tue Jun 01, 2010 10:52 am Post subject: Trying to eliminate mini-contactors |
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I've been flying for a couple of years now with NK switches (DPST, no relays) for my Subaru ECU and EFI circuits with no problem. So I say dump the contactor and switch away!
Dennis
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From: jonlaury
In my system, I have a 10-15 amp circuit to the EFI injectors. In practice, this
circuit will see about 6a , worst case. Bob N calls for a mini-contactor for
fused circuits over 7a fused.
My Honeywell switches are rated for 15a resistive, which is effectively a 100%
margin.
Unless I'm missing something, it appears to me that I could dispense with the mini-contactor
and just wire the load directly through the switch.
What say ye?
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nuckolls.bob(at)aeroelect
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| Posted: Tue Jun 01, 2010 10:57 am Post subject: Trying to eliminate mini-contactors |
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At 12:08 PM 6/1/2010, you wrote:
| Quote: |
In my system, I have a 10-15 amp circuit to the EFI injectors. In
practice, this circuit will see about 6a , worst case. Bob N calls
for a mini-contactor for fused circuits over 7a fused.
My Honeywell switches are rated for 15a resistive, which is
effectively a 100% margin.
Unless I'm missing something, it appears to me that I could dispense
with the mini-contactor and just wire the load directly through the switch.
|
The mini-contactor observes a legacy design
goal in type-certificated aviation for MINIMIZING
the length of always hot wires to some nominal
(6-inch) length or protection (7A fuse/5A breaker).
This is not an operational issue. It's MOSTLY based
on crash safety analysis that goes back decades.
What you propose will function as advertised
and as long as you avoid flying into hard
places, the risks are low. It's your choice.
Bob . . .
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